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  MEAN WELL DDR-480 series: DIN Rail DC/DC Converter - DDR-480C-48

  The MEAN WELL DDR-480C-48 is a fanless DIN rail DC/DC converter rated at 48 V, 10 A and 480 W. Its C-code input supports 33.6–67.2 VDC continuously, with a separate 28.8–33.6 VDC band for 100 ms. The metal enclosure provides reinforced 4 kVDC input-to-output isolation, adjustable output, a DC OK relay, remote ON/OFF and active current sharing. A 720 W peak is available for up to 5 seconds under the specified temperature and loading conditions. Product Datasheet Download MEAN WELL DDR-480 Datasheet (PDF) The DDR-480 section is on PDF pages 32, 33, 34, 35, 36, 37, 38, 39, 40. Refer to the complete mechanical drawings and notes when planning installation. Model and Output Ratings Full model DDR-480C-48 Series DDR-480 Input code C DC output voltage 48 V Rated output current 10 A Rated output power 480 W Output current range 0–10 A Output voltage adjustment range 48–56 V Peak output current 15 A Peak output power 720 W Peak duration 5 seconds maximum Maximum ripple and noise 150 mVp-p Voltage tolerance ±1.0% Line regulation ±0.5% Load regulation ±1.0% Adjust the output with the front-panel Vo Adj. control and retain the current, power and thermal limits. The adjustment range is the specified voltage interval. Suitable applications include railway and industrial control, security, factory automation and telecommunications. The converter can provide DC voltage conversion, additional input/output insulation and compensation for cable voltage drop within its adjustment range. Input and Hold-up Performance Continuous DC input range 33.6–67.2 VDC 100 ms input range 28.8–33.6 VDC Reference DC input 48 VDC Typical efficiency 92% Typical DC input current 11.2 A at 48 VDC Typical inrush current 30 A Set-up / rise time 500 / 60 ms Minimum hold-up at 100% load 11 ms at 48 VDC Minimum hold-up at 70% load 17 ms at 48 VDC Supply interruption classification EN 50155:2021, S2; 10 ms at full load Normal measurement conditions 48 VDC input, rated load and 25°C ambient The 100 ms low-input band is a short-duration condition and does not extend the continuous input range. Apply the separate input-voltage derating curve before selecting the load. Use the dedicated model hold-up-versus-load curve for other load levels. A larger hold-up duration at reduced load is not a full-load rating. Ripple and noise are measured at 20 MHz bandwidth using a 12-inch twisted pair terminated by parallel 0.1 µF and 47 µF capacitors. Voltage tolerance includes set-up tolerance, line regulation and load regulation. Peak Loading and Protection Peak loading capability 150% of the model rated output power for the stated peak duration Protection functions Short circuit, overload, overvoltage, overtemperature, input reverse polarity and input undervoltage Sustained overload response Constant-current limiting at 105–135% of rated output power; automatic recovery after the overload is removed Overvoltage threshold 57.6–65 V Overvoltage recovery Output shutdown; reapply input power to recover Overtemperature recovery Output shutdown; reapply input power to recover Input undervoltage turn-on specification ≥33.6 VDC Input undervoltage turn-off specification ≤33 VDC Input undervoltage recovery Automatic when the input rises above the operating threshold Internal input fuse reference 3 × Conquer MST, 8 A, 250 V; time-lag The catalogue loading example shows 480 W for 100 seconds followed by 720 W for 5 seconds. These are conditional pulse-load patterns; peak power is not a continuous rating. Apply the peak-temperature curve as well as the continuous-load limits. After the initial peak interval, a sustained overload enters the specified constant-current protection region. Keep planned peaks within 5 seconds; the overload-protection response does not authorize a longer peak interval. Two MOSFETs in series with the negative input prevent output when input polarity is reversed. Correct the polarity before restoring operation. A start-up resistor limits inrush current and is then bypassed by MOSFETs. The fuse references identify internal protection components; they are not an external fuse-selection instruction. Current Sharing Maximum parallel units 4 Output-voltage matching Difference strictly less than 0.2 V Total output-current limit Rated current per unit × number of units × 0.9 Minimum parallel load Strictly greater than 3% × rated current per unit × number of units Four-unit current limit at the stated unit ratings 36 A Current-sharing connections Connect P+ to P+ and P− to P− across all participating units The series specification describes current sharing up to 1920 W (3+1 units). Size the usable load with the 0.9 current formula, the actual model rating and all applicable derating conditions. The headline aggregate rating is not an unconditional usable load or N+1 capacity guarantee. Use matching output-voltage units, connect the outputs and sharing terminals as illustrated, and adjust their output-voltage differences to less than 0.2 V. Consult the manufacturer for arrangements beyond four units. DC OK Relay and Remote ON/OFF DC OK contact closed Power supply on / DC OK DC OK contact open Power supply off / DC fail Maximum DC OK contact rating 30 VDC, 1 A resistive load Remote-control terminals TB1 pin 4 relative to TB1 pin 2 (−Vin) Output ON Remote input open, or 5.5–10 VDC Output OFF Remote input shorted, or 0–0.8 VDC Front-panel indication DC OK indicator Observe the relay contact rating when connecting an external monitoring circuit. Remote ON/OFF controls the converter output; disconnect the DC input before installing or servicing wiring. Terminal Assignment and Wiring TB1 pin 1 FG / protective earth TB1 pin 2 DC input −Vin TB1 pin 3 DC input +Vin TB1 pin 4 Remote ON/OFF TB2 pins 1, 2 DC output +Vo TB2 pins 3, 4 DC output −Vo TB2 pins 5, 6 DC OK relay contact TB2 pin 7 P+ current sharing TB2 pin 8 P− current sharing Observe the numbered terminals in the mechanical drawing. Connect FG to the installation protective-earth system and size the DC conductors and terminations for this model’s input and output currents. Keep the DC OK contacts separate from the DC power and current-sharing connections. Allow access to the terminals, Vo Adj. control and rail latch after installation. Cooling, Temperature and Input Derating Cooling Free-air convection; fanless Required orientation for the published curves Vertical Working ambient range −40 to +80°C, subject to derating Continuous-load temperature curve 100% through 55°C; reduce along the plotted line to 40% at 80°C Full 150% peak temperature range −40 to +60°C, within the peak-duration limit Load at minimum continuous input 90% Input for 100% load 43.2 VDC and above within the continuous input range Operating altitude Up to 5000 m; overvoltage category II Altitude temperature derating Above 2000 m: reduce permitted ambient temperature by 3.5°C per additional 1000 m Input-voltage and temperature limits apply together. At low input, follow the rising input-derating line between the minimum continuous voltage and the full-load input point; short-duration input operation is not a full-load continuous extension. Above 60°C, reduce the allowed 5-second peak along its separate upper curve to 40% load at 80°C. The model-specific continuous-load curve remains a separate constraint. Provide unobstructed airflow around the installed converter. Do not treat the ambient range, peak capability or altitude statement as an unconditional full-load rating. Environmental and Mechanical Data Working humidity 5–95% RH, non-condensing Storage temperature / humidity −40 to +85°C; 5–95% RH, non-condensing Temperature coefficient ±0.03%/°C over 0–55°C Component vibration 10–500 Hz, 5 G; 10 minutes per cycle; 60 minutes on each X, Y and Z axis Vibration mounting requirement Compliance with IEC 61373 Catalogue body dimensions, W × H × D 85.5 × 125.2 × 129.2 mm Case reference 984F Drawing tolerance ±1 mm DIN rail compatibility TS35/7.5 or TS35/15 Rail supply status Reference rail shown; not included with the unit Unit mass, catalogue PACKING reference 1375 g Catalogue packing 1.375 kg; 8 units / 12 kg / 0.95 CUFT Minimum MTBF 750.3K hours, Telcordia SR-332 (Bellcore); 101.7K hours, MIL-HDBK-217F at 25°C Nominal switching frequency 65 kHz Catalogue warranty 3 years Use the illustrated DIN rail mounting and removal arrangement. The body dimensions do not include the installed rail, external wiring or cable-bend clearance. Select the rail and installation hardware for the enclosure. The listed mass is the explicit per-unit catalogue packing reference; it is not a measured installation mass or the gross mass of an individual shipping box. Safety, Isolation and EMC Catalogue-listed safety approvals IEC 62368-1; UL 62368-1; AS/NZS 62368-1; EAC TP TC 004 Input-to-output isolation 4 kVDC; reinforced isolation Input-to-FG withstand voltage 2.5 kVDC Output-to-FG withstand voltage 0.71 kVDC Isolation resistance >100 MΩ between input–output, input–FG and output–FG at 500 VDC, 25°C and 70% RH Conducted emissions BS EN / EN 55032, Class A Radiated emissions BS EN / EN 55032, Class B Immunity standards BS EN / EN 55035 Railway standards BS EN / EN 50155; IEC 60571; IEC 61373 shock and vibration; BS EN / EN 50121-3-2 EMC; BS EN / EN 45545-2 fire protection The six listed immunity tests use criterion A: ESD level 3 at 8 kV air and 6 kV contact; radiated RF level 3 at 10 V/m; EFT/burst level 3 at 2 kV; surge level 3 at 1 kV line–line and 2 kV line–line–FG; conducted RF level 3 at 10 V; and magnetic field level 4 at 30 A/m. The emissions table names BS EN / EN 61000-3-3 for voltage flicker without a numerical test level; it does not specify a harmonic-current limit. Confirm EMC compliance of the complete equipment after integration. Railway Environmental and Fire Tests The catalogue reports PASS for EN 50155 dry heat (section 13.4.5: 70°C for 6 hours and 85°C for 10 minutes); cyclic damp heat (13.4.8: 25–55°C, 90–100% RH, 48 hours); vibration (13.4.10: 19°C, 65% RH, 10 minutes); shock (13.4.10: 21 ±3°C, 65 ±5% RH, 30 ms ×18); low-temperature storage (13.4.6: −40°C, 16 hours); and salt mist (13.4.13: 35 ±2°C, 96 hours). These test conditions do not expand continuous operating limits. EN 45545-2:2020 results are marked PASS at HL1, HL2 and HL3 for all listed items: PCB R22 oxygen index, smoke density and smoke toxicity; PCB R24 oxygen index; PCB R25 glow-wire; potting R24 oxygen index; and terminal-block R26 vertical flame. Test methods are EN ISO 4589-2:2017, EN ISO 5659-2:2017, EN 17084:2018, EN 60695-2-11:2014 and EN 60695-11-10:2013 as applicable. Component results do not certify the entire vehicle or equipment.

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  MEAN WELL DDR-30 series: DIN Rail DC/DC Converter - DDR-30L-24

  MEAN WELL DDR-30L-24 is an isolated DIN rail DC/DC converter with a 24 V output, 1.25 A rated current and 30 W rated power. This L-input version accepts 18–75 VDC. Its 35 mm (2 SU) plastic housing, adjustable output and fanless convection cooling suit industrial control, automation and telecom equipment within the specified input and thermal limits. Product Datasheet Download MEAN WELL DDR-30 Datasheet (PDF) The DDR-30 section is on PDF pages 6, 7, 8, 9. Refer to the complete mechanical drawings and notes when planning installation. Model and DC Output Full model DDR-30L-24 Series DDR-30 Input-version code L DC output voltage 24 V Rated output current 1.25 A Rated output power 30 W Output current range 0–1.25 A; no minimum load required Output-voltage adjustment range 21.6–28 V Maximum ripple and noise 100 mVp-p Voltage tolerance ±2.0% Line regulation ±0.5% Load regulation ±0.5% Maximum external capacitive load 1000 µF Set-up / rise time at full load 120 ms / 85 ms Typical hold-up time 18 ms at 48 VDC input Unless otherwise specified, the electrical measurements use 48 VDC input, rated load and 25°C ambient temperature. Voltage tolerance includes set-up tolerance, line regulation and load regulation. Ripple and noise are measured with 20 MHz bandwidth using a 12-inch twisted-pair connection terminated with 0.1 µF and 47 µF capacitors in parallel. The external capacitive-load limit above applies to this output voltage. Use the front Vo Adj. control within the stated adjustment range. Observe the rated current and power limits together with the input-voltage and thermal derating requirements. DC Input and Efficiency Continuous DC input range 18–75 VDC Input-range ratio 4:1 Normal input used for measurements 48 VDC Typical efficiency 91% Typical DC input current 0.8 A at 48 VDC Typical input inrush current 15 A at 48 VDC Nominal switching frequency 100 kHz Protection Functions Short-circuit / overload response Constant-current limiting; automatic recovery after the fault is removed Overload threshold 110–150% of rated output power Overvoltage threshold 28.8–34 V Overvoltage recovery Output shutdown; reapply input power to recover Reverse-input protection Internal MOSFET; no damage and automatic recovery after the reversed-input fault is removed Undervoltage lockout thresholds Power ON ≥18 VDC; power OFF ≤17 VDC Protection responses do not increase the continuous output rating. Select the DC input version by its specified operating range and observe the derating limits. Operating Environment and Load Derating Operating ambient range −40 to +85°C, subject to the applicable load-derating curves Thermal load limits Vertical mounting: 100% load from −40 to +60°C; 50% at 75°C and 40% at 85°C. Follow the curve between these points. Input-voltage load limits 90% load from 18 VDC to below 24 VDC; 100% from 24 to 75 VDC, subject to thermal derating. Operating humidity 5–95% RH, non-condensing Storage temperature and humidity −40 to +85°C; 5–95% RH, non-condensing Temperature coefficient ±0.03%/°C over 0–60°C Operating altitude 5000 m Vibration Component: 10–500 Hz, 2 G, 10 minutes per cycle and 60 minutes on each X, Y and Z axis; mounting to IEC 60068-2-6 The curves apply to vertical mounting with free-air convection. Use the most restrictive input-voltage and temperature limits together, and maintain airflow around the converter. Percentages refer to the selected model’s rated output. For fanless operation above 2000 m, reduce the allowable ambient temperature by 3.5°C per additional 1000 m, within the specified 5000 m operating-altitude limit. Dimensions, Installation and Connections Dimensions, W × H × D 35 × 90 × 54.5 mm DIN-module width 35 mm; 2 SU Mechanical drawing tolerance ±0.5 mm unless marked otherwise Overall depth shown including the rear projection 58.4 mm Enclosure and cooling Plastic housing; fanless free-air convection Compatible DIN rails TS35/7.5 or TS35/15 Front controls and indication Power LED and Vo Adj. output-voltage adjustment Terminal tightening torque shown 4.4 lb-in Terminal 1 DC output +Vo Terminal 2 DC output −Vo Terminal 3 DC input −Vin Terminal 4 DC input +Vin Unit mass 120 g; catalogue PACKING reference per unit Connect input and output according to the numbered terminal assignments for this model. Mount on an admissible DIN rail and allow adequate space for natural convection and wiring. DIN rail dimensions identify the mounting interface. The allocated catalogue pages do not specify a separately orderable MEAN WELL rail, cable or mating-connector kit, or state that such accessories are included. In the front-view drawing, terminals 2 and 1 are at the top and terminals 4 and 3 are at the bottom. Follow the terminal numbers and polarity markings when wiring. Safety, EMC and Reliability Catalogue approved safety standards UL 62368-1; IEC 62368-1; AS/NZS 62368.1 Catalogue safety design reference UL 508 Input-to-output withstand voltage 4 kVDC; reinforced isolation Input-to-output insulation resistance Greater than 100 MΩ at 500 VDC, 25°C and 70% RH Conducted emissions BS EN/EN 55032, Class B Radiated emissions BS EN/EN 55032, Class B EMC immunity references BS EN/EN 55035; BS EN/EN 61000-6-2 (BS EN/EN 50082-2) ESD immunity BS EN/EN 61000-4-2: Level 3, 8 kV air and 6 kV contact; criterion A Radiated-field immunity BS EN/EN 61000-4-3: Level 3, 10 V/m; criterion A EFT / burst immunity BS EN/EN 61000-4-4: Level 3, 2 kV; criterion A Surge immunity BS EN/EN 61000-4-5: Level 3, 1 kV line–line; criterion A Conducted immunity BS EN/EN 61000-4-6: Level 3, 10 V; criterion A Magnetic-field immunity BS EN/EN 61000-4-8: Level 4, 30 A/m; criterion A MTBF, Telcordia SR-332 (Bellcore) 2780.3 thousand hours minimum MTBF, MIL-HDBK-217F 483.8 thousand hours minimum at 25°C Catalogue warranty period 3 years; subject to manufacturer terms Catalogue approvals and design references apply to the converter. The completed equipment must be checked again for compliance with the applicable EMC directives and installation requirements. MTBF figures are calculated reliability references under the stated methods and conditions; they are not guaranteed service-life values.

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  MEAN WELL DDR-15 series: DIN Rail DC/DC Converter - DDR-15L-5

  MEAN WELL DDR-15L-5 is an isolated DIN rail DC/DC converter with a 5 V output, 3 A rated current and 15 W rated power. This L-input version accepts 18–75 VDC. Its 17.5 mm (1 SU) plastic housing, adjustable output and fanless convection cooling suit industrial control, automation and telecom equipment within the specified input and thermal limits. Product Datasheet Download MEAN WELL DDR-15 Datasheet (PDF) The DDR-15 section is on PDF pages 1, 2, 3, 4, 5. Refer to the complete mechanical drawings and notes when planning installation. Model and DC Output Full model DDR-15L-5 Series DDR-15 Input-version code L DC output voltage 5 V Rated output current 3 A Rated output power 15 W Output current range 0–3 A; no minimum load required Output-voltage adjustment range 4.5–5.5 V Maximum ripple and noise 50 mVp-p Voltage tolerance ±2.0% Line regulation ±0.5% Load regulation ±1% Maximum external capacitive load 3300 µF Set-up / rise time at full load 120 ms / 85 ms Typical hold-up time 16 ms at 48 VDC input Unless otherwise specified, the electrical measurements use 48 VDC input, rated load and 25°C ambient temperature. Voltage tolerance includes set-up tolerance, line regulation and load regulation. Ripple and noise are measured with 20 MHz bandwidth using a 12-inch twisted-pair connection terminated with 0.1 µF and 47 µF capacitors in parallel. The external capacitive-load limit above applies to this output voltage. Use the front Vo Adj. control within the stated adjustment range. Observe the rated current and power limits together with the input-voltage and thermal derating requirements. DC Input and Efficiency Continuous DC input range 18–75 VDC Input-range ratio 4:1 Normal input used for measurements 48 VDC Typical efficiency 85% Typical DC input current 0.4 A at 48 VDC Typical input inrush current 15 A at 48 VDC Nominal switching frequency 100 kHz Protection Functions Short-circuit / overload response Hiccup mode; automatic recovery after the fault is removed Overload threshold 110–150% of rated output power Overvoltage threshold 5.75–7 V Overvoltage recovery Output shutdown; reapply input power to recover Reverse-input protection Internal MOSFET; no damage and automatic recovery after the reversed-input fault is removed Undervoltage lockout thresholds Power ON ≥18 VDC; power OFF ≤17 VDC Protection responses do not increase the continuous output rating. Select the DC input version by its specified operating range and observe the derating limits. Operating Environment and Load Derating Operating ambient range −40 to +85°C, subject to the applicable load-derating curves Thermal load limits Vertical mounting: 100% load from −40 to +60°C; 50% at 75°C and 40% at 85°C. Follow the curve between these points. Input-voltage load limits 90% load from 18 VDC to below 24 VDC; 100% from 24 to 75 VDC, subject to thermal derating. Operating humidity 5–95% RH, non-condensing Storage temperature and humidity −40 to +85°C; 5–95% RH, non-condensing Temperature coefficient ±0.03%/°C over 0–60°C Operating altitude 2000 m Vibration Component: 10–500 Hz, 2 G, 10 minutes per cycle and 60 minutes on each X, Y and Z axis; mounting to IEC 60068-2-6 The curves apply to vertical mounting with free-air convection. Use the most restrictive input-voltage and temperature limits together, and maintain airflow around the converter. Percentages refer to the selected model’s rated output. This L-input model has a specified operating-altitude limit of 2000 m. The catalogue’s general high-altitude derating note does not extend that model-specific limit. Dimensions, Installation and Connections Dimensions, W × H × D 17.5 × 90 × 54.5 mm DIN-module width 17.5 mm; 1 SU Mechanical drawing tolerance ±0.5 mm unless marked otherwise Overall depth shown including the rear projection 58.4 mm Enclosure and cooling Plastic housing; fanless free-air convection Compatible DIN rails TS35/7.5 or TS35/15 Front controls and indication Power LED and Vo Adj. output-voltage adjustment Terminal tightening torque shown 4.4 lb-in Terminal 1 DC output +Vo Terminal 2 DC output −Vo Terminal 3 DC input −Vin Terminal 4 DC input +Vin Unit mass 68 g; catalogue PACKING reference per unit Connect input and output according to the numbered terminal assignments for this model. Mount on an admissible DIN rail and allow adequate space for natural convection and wiring. DIN rail dimensions identify the mounting interface. The allocated catalogue pages do not specify a separately orderable MEAN WELL rail, cable or mating-connector kit, or state that such accessories are included. Safety, EMC and Reliability Catalogue approved safety standards IEC 62368-1 (LVD); AS/NZS 62368.1 Catalogue safety design reference UL 508 Input-to-output withstand voltage 4 kVDC; reinforced isolation Input-to-output insulation resistance Greater than 100 MΩ at 500 VDC, 25°C and 70% RH Conducted emissions BS EN/EN 55032, Class B Radiated emissions BS EN/EN 55032, Class B EMC immunity references BS EN/EN 55035; BS EN/EN 61000-6-2 (BS EN/EN 50082-2) ESD immunity BS EN/EN 61000-4-2: Level 3, 8 kV air and 6 kV contact; criterion A Radiated-field immunity BS EN/EN 61000-4-3: Level 3, 10 V/m; criterion A EFT / burst immunity BS EN/EN 61000-4-4: Level 3, 2 kV; criterion A Surge immunity BS EN/EN 61000-4-5: Level 3, 1 kV line–line; criterion A Conducted immunity BS EN/EN 61000-4-6: Level 3, 10 V; criterion A Magnetic-field immunity BS EN/EN 61000-4-8: Level 4, 30 A/m; criterion A MTBF, MIL-HDBK-217F 907 thousand hours minimum at 25°C Catalogue warranty period 3 years; subject to manufacturer terms Catalogue approvals and design references apply to the converter. The completed equipment must be checked again for compliance with the applicable EMC directives and installation requirements. MTBF figures are calculated reliability references under the stated methods and conditions; they are not guaranteed service-life values.

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  MEAN WELL DDR-480 series: DIN Rail DC/DC Converter - DDR-480D-48

  The MEAN WELL DDR-480D-48 is a fanless DIN rail DC/DC converter rated at 48 V, 10 A and 480 W. Its D-code input supports 67.2–154 VDC continuously, with a separate 66–67.2 VDC band for 100 ms. The metal enclosure provides reinforced 4 kVDC input-to-output isolation, adjustable output, a DC OK relay, remote ON/OFF and active current sharing. A 720 W peak is available for up to 5 seconds under the specified temperature and loading conditions. Product Datasheet Download MEAN WELL DDR-480 Datasheet (PDF) The DDR-480 section is on PDF pages 32, 33, 34, 35, 36, 37, 38, 39, 40. Refer to the complete mechanical drawings and notes when planning installation. Model and Output Ratings Full model DDR-480D-48 Series DDR-480 Input code D DC output voltage 48 V Rated output current 10 A Rated output power 480 W Output current range 0–10 A Output voltage adjustment range 48–56 V Peak output current 15 A Peak output power 720 W Peak duration 5 seconds maximum Maximum ripple and noise 150 mVp-p Voltage tolerance ±1.0% Line regulation ±0.5% Load regulation ±1.0% Adjust the output with the front-panel Vo Adj. control and retain the current, power and thermal limits. The adjustment range is the specified voltage interval. Suitable applications include railway and industrial control, security, factory automation and telecommunications. The converter can provide DC voltage conversion, additional input/output insulation and compensation for cable voltage drop within its adjustment range. Input and Hold-up Performance Continuous DC input range 67.2–154 VDC 100 ms input range 66–67.2 VDC Reference DC input 110 VDC Typical efficiency 93% Typical DC input current 5 A at 110 VDC Typical inrush current 30 A Set-up / rise time 500 / 60 ms Minimum hold-up at 100% load 16 ms at 110 VDC Minimum hold-up at 70% load 24 ms at 110 VDC Supply interruption classification EN 50155:2021, S2; 10 ms at full load Normal measurement conditions 110 VDC input, rated load and 25°C ambient The 100 ms low-input band is a short-duration condition and does not extend the continuous input range. Apply the separate input-voltage derating curve before selecting the load. Use the dedicated model hold-up-versus-load curve for other load levels. A larger hold-up duration at reduced load is not a full-load rating. Ripple and noise are measured at 20 MHz bandwidth using a 12-inch twisted pair terminated by parallel 0.1 µF and 47 µF capacitors. Voltage tolerance includes set-up tolerance, line regulation and load regulation. Peak Loading and Protection Peak loading capability 150% of the model rated output power for the stated peak duration Protection functions Short circuit, overload, overvoltage, overtemperature, input reverse polarity and input undervoltage Sustained overload response Constant-current limiting at 105–135% of rated output power; automatic recovery after the overload is removed Overvoltage threshold 57.6–65 V Overvoltage recovery Output shutdown; reapply input power to recover Overtemperature recovery Output shutdown; reapply input power to recover Input undervoltage turn-on specification ≥67.2 VDC Input undervoltage turn-off specification ≤65 VDC Input undervoltage recovery Automatic when the input rises above the operating threshold Internal input fuse reference 2 × Conquer MST, 6.3 A, 250 V; time-lag The catalogue loading example shows 480 W for 100 seconds followed by 720 W for 5 seconds. These are conditional pulse-load patterns; peak power is not a continuous rating. Apply the peak-temperature curve as well as the continuous-load limits. After the initial peak interval, a sustained overload enters the specified constant-current protection region. Keep planned peaks within 5 seconds; the overload-protection response does not authorize a longer peak interval. Two MOSFETs in series with the negative input prevent output when input polarity is reversed. Correct the polarity before restoring operation. A start-up resistor limits inrush current and is then bypassed by MOSFETs. The fuse references identify internal protection components; they are not an external fuse-selection instruction. Current Sharing Maximum parallel units 4 Output-voltage matching Difference strictly less than 0.2 V Total output-current limit Rated current per unit × number of units × 0.9 Minimum parallel load Strictly greater than 3% × rated current per unit × number of units Four-unit current limit at the stated unit ratings 36 A Current-sharing connections Connect P+ to P+ and P− to P− across all participating units The series specification describes current sharing up to 1920 W (3+1 units). Size the usable load with the 0.9 current formula, the actual model rating and all applicable derating conditions. The headline aggregate rating is not an unconditional usable load or N+1 capacity guarantee. Use matching output-voltage units, connect the outputs and sharing terminals as illustrated, and adjust their output-voltage differences to less than 0.2 V. Consult the manufacturer for arrangements beyond four units. DC OK Relay and Remote ON/OFF DC OK contact closed Power supply on / DC OK DC OK contact open Power supply off / DC fail Maximum DC OK contact rating 30 VDC, 1 A resistive load Remote-control terminals TB1 pin 4 relative to TB1 pin 2 (−Vin) Output ON Remote input open, or 5.5–10 VDC Output OFF Remote input shorted, or 0–0.8 VDC Front-panel indication DC OK indicator Observe the relay contact rating when connecting an external monitoring circuit. Remote ON/OFF controls the converter output; disconnect the DC input before installing or servicing wiring. Terminal Assignment and Wiring TB1 pin 1 FG / protective earth TB1 pin 2 DC input −Vin TB1 pin 3 DC input +Vin TB1 pin 4 Remote ON/OFF TB2 pins 1, 2 DC output +Vo TB2 pins 3, 4 DC output −Vo TB2 pins 5, 6 DC OK relay contact TB2 pin 7 P+ current sharing TB2 pin 8 P− current sharing Observe the numbered terminals in the mechanical drawing. Connect FG to the installation protective-earth system and size the DC conductors and terminations for this model’s input and output currents. Keep the DC OK contacts separate from the DC power and current-sharing connections. Allow access to the terminals, Vo Adj. control and rail latch after installation. Cooling, Temperature and Input Derating Cooling Free-air convection; fanless Required orientation for the published curves Vertical Working ambient range −40 to +80°C, subject to derating Continuous-load temperature curve 100% through 60°C; reduce along the plotted line to 40% at 80°C Full 150% peak temperature range −40 to +60°C, within the peak-duration limit Load at minimum continuous input 90% Input for 100% load 86.4 VDC and above within the continuous input range Operating altitude Up to 5000 m; overvoltage category II Altitude temperature derating Above 2000 m: reduce permitted ambient temperature by 3.5°C per additional 1000 m Input-voltage and temperature limits apply together. At low input, follow the rising input-derating line between the minimum continuous voltage and the full-load input point; short-duration input operation is not a full-load continuous extension. Above 60°C, reduce the allowed 5-second peak along its separate upper curve to 40% load at 80°C. The model-specific continuous-load curve remains a separate constraint. Provide unobstructed airflow around the installed converter. Do not treat the ambient range, peak capability or altitude statement as an unconditional full-load rating. Environmental and Mechanical Data Working humidity 5–95% RH, non-condensing Storage temperature / humidity −40 to +85°C; 5–95% RH, non-condensing Temperature coefficient ±0.03%/°C over 0–55°C Component vibration 10–500 Hz, 5 G; 10 minutes per cycle; 60 minutes on each X, Y and Z axis Vibration mounting requirement Compliance with IEC 61373 Catalogue body dimensions, W × H × D 85.5 × 125.2 × 129.2 mm Case reference 984F Drawing tolerance ±1 mm DIN rail compatibility TS35/7.5 or TS35/15 Rail supply status Reference rail shown; not included with the unit Unit mass, catalogue PACKING reference 1375 g Catalogue packing 1.375 kg; 8 units / 12 kg / 0.95 CUFT Minimum MTBF 750.3K hours, Telcordia SR-332 (Bellcore); 101.7K hours, MIL-HDBK-217F at 25°C Nominal switching frequency 65 kHz Catalogue warranty 3 years Use the illustrated DIN rail mounting and removal arrangement. The body dimensions do not include the installed rail, external wiring or cable-bend clearance. Select the rail and installation hardware for the enclosure. The listed mass is the explicit per-unit catalogue packing reference; it is not a measured installation mass or the gross mass of an individual shipping box. Safety, Isolation and EMC Catalogue-listed safety approvals IEC 62368-1; UL 62368-1; AS/NZS 62368-1; EAC TP TC 004 Input-to-output isolation 4 kVDC; reinforced isolation Input-to-FG withstand voltage 2.5 kVDC Output-to-FG withstand voltage 0.71 kVDC Isolation resistance >100 MΩ between input–output, input–FG and output–FG at 500 VDC, 25°C and 70% RH Conducted emissions BS EN / EN 55032, Class A Radiated emissions BS EN / EN 55032, Class B Immunity standards BS EN / EN 55035 Railway standards BS EN / EN 50155; IEC 60571; IEC 61373 shock and vibration; BS EN / EN 50121-3-2 EMC; BS EN / EN 45545-2 fire protection The six listed immunity tests use criterion A: ESD level 3 at 8 kV air and 6 kV contact; radiated RF level 3 at 10 V/m; EFT/burst level 3 at 2 kV; surge level 3 at 1 kV line–line and 2 kV line–line–FG; conducted RF level 3 at 10 V; and magnetic field level 4 at 30 A/m. The emissions table names BS EN / EN 61000-3-3 for voltage flicker without a numerical test level; it does not specify a harmonic-current limit. Confirm EMC compliance of the complete equipment after integration. Railway Environmental and Fire Tests The catalogue reports PASS for EN 50155 dry heat (section 13.4.5: 70°C for 6 hours and 85°C for 10 minutes); cyclic damp heat (13.4.8: 25–55°C, 90–100% RH, 48 hours); vibration (13.4.10: 19°C, 65% RH, 10 minutes); shock (13.4.10: 21 ±3°C, 65 ±5% RH, 30 ms ×18); low-temperature storage (13.4.6: −40°C, 16 hours); and salt mist (13.4.13: 35 ±2°C, 96 hours). These test conditions do not expand continuous operating limits. EN 45545-2:2020 results are marked PASS at HL1, HL2 and HL3 for all listed items: PCB R22 oxygen index, smoke density and smoke toxicity; PCB R24 oxygen index; PCB R25 glow-wire; potting R24 oxygen index; and terminal-block R26 vertical flame. Test methods are EN ISO 4589-2:2017, EN ISO 5659-2:2017, EN 17084:2018, EN 60695-2-11:2014 and EN 60695-11-10:2013 as applicable. Component results do not certify the entire vehicle or equipment.

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  MEAN WELL DDR-480 series: DIN Rail DC/DC Converter - DDR-480D-24

  The MEAN WELL DDR-480D-24 is a fanless DIN rail DC/DC converter rated at 24 V, 20 A and 480 W. Its D-code input supports 67.2–154 VDC continuously, with a separate 66–67.2 VDC band for 100 ms. The metal enclosure provides reinforced 4 kVDC input-to-output isolation, adjustable output, a DC OK relay, remote ON/OFF and active current sharing. A 720 W peak is available for up to 5 seconds under the specified temperature and loading conditions. Product Datasheet Download MEAN WELL DDR-480 Datasheet (PDF) The DDR-480 section is on PDF pages 32, 33, 34, 35, 36, 37, 38, 39, 40. Refer to the complete mechanical drawings and notes when planning installation. Model and Output Ratings Full model DDR-480D-24 Series DDR-480 Input code D DC output voltage 24 V Rated output current 20 A Rated output power 480 W Output current range 0–20 A Output voltage adjustment range 24–28 V Peak output current 30 A Peak output power 720 W Peak duration 5 seconds maximum Maximum ripple and noise 120 mVp-p Voltage tolerance ±1.0% Line regulation ±0.5% Load regulation ±1.0% Adjust the output with the front-panel Vo Adj. control and retain the current, power and thermal limits. The adjustment range is the specified voltage interval. Suitable applications include railway and industrial control, security, factory automation and telecommunications. The converter can provide DC voltage conversion, additional input/output insulation and compensation for cable voltage drop within its adjustment range. Input and Hold-up Performance Continuous DC input range 67.2–154 VDC 100 ms input range 66–67.2 VDC Reference DC input 110 VDC Typical efficiency 92% Typical DC input current 5 A at 110 VDC Typical inrush current 30 A Set-up / rise time 500 / 60 ms Minimum hold-up at 100% load 16 ms at 110 VDC Minimum hold-up at 70% load 24 ms at 110 VDC Supply interruption classification EN 50155:2021, S2; 10 ms at full load Normal measurement conditions 110 VDC input, rated load and 25°C ambient The 100 ms low-input band is a short-duration condition and does not extend the continuous input range. Apply the separate input-voltage derating curve before selecting the load. Use the dedicated model hold-up-versus-load curve for other load levels. A larger hold-up duration at reduced load is not a full-load rating. Ripple and noise are measured at 20 MHz bandwidth using a 12-inch twisted pair terminated by parallel 0.1 µF and 47 µF capacitors. Voltage tolerance includes set-up tolerance, line regulation and load regulation. Peak Loading and Protection Peak loading capability 150% of the model rated output power for the stated peak duration Protection functions Short circuit, overload, overvoltage, overtemperature, input reverse polarity and input undervoltage Sustained overload response Constant-current limiting at 105–135% of rated output power; automatic recovery after the overload is removed Overvoltage threshold 28.8–35 V Overvoltage recovery Output shutdown; reapply input power to recover Overtemperature recovery Output shutdown; reapply input power to recover Input undervoltage turn-on specification ≥67.2 VDC Input undervoltage turn-off specification ≤65 VDC Input undervoltage recovery Automatic when the input rises above the operating threshold Internal input fuse reference 2 × Conquer MST, 6.3 A, 250 V; time-lag The catalogue loading example shows 480 W for 100 seconds followed by 720 W for 5 seconds. These are conditional pulse-load patterns; peak power is not a continuous rating. Apply the peak-temperature curve as well as the continuous-load limits. After the initial peak interval, a sustained overload enters the specified constant-current protection region. Keep planned peaks within 5 seconds; the overload-protection response does not authorize a longer peak interval. Two MOSFETs in series with the negative input prevent output when input polarity is reversed. Correct the polarity before restoring operation. A start-up resistor limits inrush current and is then bypassed by MOSFETs. The fuse references identify internal protection components; they are not an external fuse-selection instruction. Current Sharing Maximum parallel units 4 Output-voltage matching Difference strictly less than 0.2 V Total output-current limit Rated current per unit × number of units × 0.9 Minimum parallel load Strictly greater than 3% × rated current per unit × number of units Four-unit current limit at the stated unit ratings 72 A Current-sharing connections Connect P+ to P+ and P− to P− across all participating units The series specification describes current sharing up to 1920 W (3+1 units). Size the usable load with the 0.9 current formula, the actual model rating and all applicable derating conditions. The headline aggregate rating is not an unconditional usable load or N+1 capacity guarantee. Use matching output-voltage units, connect the outputs and sharing terminals as illustrated, and adjust their output-voltage differences to less than 0.2 V. Consult the manufacturer for arrangements beyond four units. DC OK Relay and Remote ON/OFF DC OK contact closed Power supply on / DC OK DC OK contact open Power supply off / DC fail Maximum DC OK contact rating 30 VDC, 1 A resistive load Remote-control terminals TB1 pin 4 relative to TB1 pin 2 (−Vin) Output ON Remote input open, or 5.5–10 VDC Output OFF Remote input shorted, or 0–0.8 VDC Front-panel indication DC OK indicator Observe the relay contact rating when connecting an external monitoring circuit. Remote ON/OFF controls the converter output; disconnect the DC input before installing or servicing wiring. Terminal Assignment and Wiring TB1 pin 1 FG / protective earth TB1 pin 2 DC input −Vin TB1 pin 3 DC input +Vin TB1 pin 4 Remote ON/OFF TB2 pins 1, 2 DC output +Vo TB2 pins 3, 4 DC output −Vo TB2 pins 5, 6 DC OK relay contact TB2 pin 7 P+ current sharing TB2 pin 8 P− current sharing Observe the numbered terminals in the mechanical drawing. Connect FG to the installation protective-earth system and size the DC conductors and terminations for this model’s input and output currents. Keep the DC OK contacts separate from the DC power and current-sharing connections. Allow access to the terminals, Vo Adj. control and rail latch after installation. Cooling, Temperature and Input Derating Cooling Free-air convection; fanless Required orientation for the published curves Vertical Working ambient range −40 to +80°C, subject to derating Continuous-load temperature curve 100% through 60°C; reduce along the plotted line to 40% at 80°C Full 150% peak temperature range −40 to +60°C, within the peak-duration limit Load at minimum continuous input 90% Input for 100% load 86.4 VDC and above within the continuous input range Operating altitude Up to 5000 m; overvoltage category II Altitude temperature derating Above 2000 m: reduce permitted ambient temperature by 3.5°C per additional 1000 m Input-voltage and temperature limits apply together. At low input, follow the rising input-derating line between the minimum continuous voltage and the full-load input point; short-duration input operation is not a full-load continuous extension. Above 60°C, reduce the allowed 5-second peak along its separate upper curve to 40% load at 80°C. The model-specific continuous-load curve remains a separate constraint. Provide unobstructed airflow around the installed converter. Do not treat the ambient range, peak capability or altitude statement as an unconditional full-load rating. Environmental and Mechanical Data Working humidity 5–95% RH, non-condensing Storage temperature / humidity −40 to +85°C; 5–95% RH, non-condensing Temperature coefficient ±0.03%/°C over 0–55°C Component vibration 10–500 Hz, 5 G; 10 minutes per cycle; 60 minutes on each X, Y and Z axis Vibration mounting requirement Compliance with IEC 61373 Catalogue body dimensions, W × H × D 85.5 × 125.2 × 129.2 mm Case reference 984F Drawing tolerance ±1 mm DIN rail compatibility TS35/7.5 or TS35/15 Rail supply status Reference rail shown; not included with the unit Unit mass, catalogue PACKING reference 1375 g Catalogue packing 1.375 kg; 8 units / 12 kg / 0.95 CUFT Minimum MTBF 750.3K hours, Telcordia SR-332 (Bellcore); 101.7K hours, MIL-HDBK-217F at 25°C Nominal switching frequency 65 kHz Catalogue warranty 3 years Use the illustrated DIN rail mounting and removal arrangement. The body dimensions do not include the installed rail, external wiring or cable-bend clearance. Select the rail and installation hardware for the enclosure. The listed mass is the explicit per-unit catalogue packing reference; it is not a measured installation mass or the gross mass of an individual shipping box. Safety, Isolation and EMC Catalogue-listed safety approvals IEC 62368-1; UL 62368-1; AS/NZS 62368-1; EAC TP TC 004 Input-to-output isolation 4 kVDC; reinforced isolation Input-to-FG withstand voltage 2.5 kVDC Output-to-FG withstand voltage 0.71 kVDC Isolation resistance >100 MΩ between input–output, input–FG and output–FG at 500 VDC, 25°C and 70% RH Conducted emissions BS EN / EN 55032, Class A Radiated emissions BS EN / EN 55032, Class B Immunity standards BS EN / EN 55035 Railway standards BS EN / EN 50155; IEC 60571; IEC 61373 shock and vibration; BS EN / EN 50121-3-2 EMC; BS EN / EN 45545-2 fire protection The six listed immunity tests use criterion A: ESD level 3 at 8 kV air and 6 kV contact; radiated RF level 3 at 10 V/m; EFT/burst level 3 at 2 kV; surge level 3 at 1 kV line–line and 2 kV line–line–FG; conducted RF level 3 at 10 V; and magnetic field level 4 at 30 A/m. The emissions table names BS EN / EN 61000-3-3 for voltage flicker without a numerical test level; it does not specify a harmonic-current limit. Confirm EMC compliance of the complete equipment after integration. Railway Environmental and Fire Tests The catalogue reports PASS for EN 50155 dry heat (section 13.4.5: 70°C for 6 hours and 85°C for 10 minutes); cyclic damp heat (13.4.8: 25–55°C, 90–100% RH, 48 hours); vibration (13.4.10: 19°C, 65% RH, 10 minutes); shock (13.4.10: 21 ±3°C, 65 ±5% RH, 30 ms ×18); low-temperature storage (13.4.6: −40°C, 16 hours); and salt mist (13.4.13: 35 ±2°C, 96 hours). These test conditions do not expand continuous operating limits. EN 45545-2:2020 results are marked PASS at HL1, HL2 and HL3 for all listed items: PCB R22 oxygen index, smoke density and smoke toxicity; PCB R24 oxygen index; PCB R25 glow-wire; potting R24 oxygen index; and terminal-block R26 vertical flame. Test methods are EN ISO 4589-2:2017, EN ISO 5659-2:2017, EN 17084:2018, EN 60695-2-11:2014 and EN 60695-11-10:2013 as applicable. Component results do not certify the entire vehicle or equipment.

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  MEAN WELL DDR-480 series: DIN Rail DC/DC Converter - DDR-480D-12

  The MEAN WELL DDR-480D-12 is a fanless DIN rail DC/DC converter rated at 12 V, 33.4 A and 400.8 W. Its D-code input supports 67.2–154 VDC continuously, with a separate 66–67.2 VDC band for 100 ms. The metal enclosure provides reinforced 4 kVDC input-to-output isolation, adjustable output, a DC OK relay, remote ON/OFF and active current sharing. A 601.2 W peak is available for up to 5 seconds under the specified temperature and loading conditions. Product Datasheet Download MEAN WELL DDR-480 Datasheet (PDF) The DDR-480 section is on PDF pages 32, 33, 34, 35, 36, 37, 38, 39, 40. Refer to the complete mechanical drawings and notes when planning installation. Model and Output Ratings Full model DDR-480D-12 Series DDR-480 Input code D DC output voltage 12 V Rated output current 33.4 A Rated output power 400.8 W Output current range 0–33.4 A Output voltage adjustment range 12–14 V Peak output current 50.1 A Peak output power 601.2 W Peak duration 5 seconds maximum Maximum ripple and noise 100 mVp-p Voltage tolerance ±1.0% Line regulation ±0.5% Load regulation ±1.0% Adjust the output with the front-panel Vo Adj. control and retain the current, power and thermal limits. The adjustment range is the specified voltage interval. Suitable applications include railway and industrial control, security, factory automation and telecommunications. The converter can provide DC voltage conversion, additional input/output insulation and compensation for cable voltage drop within its adjustment range. Input and Hold-up Performance Continuous DC input range 67.2–154 VDC 100 ms input range 66–67.2 VDC Reference DC input 110 VDC Typical efficiency 91% Typical DC input current 5 A at 110 VDC Typical inrush current 30 A Set-up / rise time 500 / 60 ms Minimum hold-up at 100% load 16 ms at 110 VDC Minimum hold-up at 70% load 24 ms at 110 VDC Supply interruption classification EN 50155:2021, S2; 10 ms at full load Normal measurement conditions 110 VDC input, rated load and 25°C ambient The 100 ms low-input band is a short-duration condition and does not extend the continuous input range. Apply the separate input-voltage derating curve before selecting the load. Use the dedicated model hold-up-versus-load curve for other load levels. A larger hold-up duration at reduced load is not a full-load rating. Ripple and noise are measured at 20 MHz bandwidth using a 12-inch twisted pair terminated by parallel 0.1 µF and 47 µF capacitors. Voltage tolerance includes set-up tolerance, line regulation and load regulation. Peak Loading and Protection Peak loading capability 150% of the model rated output power for the stated peak duration Protection functions Short circuit, overload, overvoltage, overtemperature, input reverse polarity and input undervoltage Sustained overload response Constant-current limiting at 105–135% of rated output power; automatic recovery after the overload is removed Overvoltage threshold 14.4–17.5 V Overvoltage recovery Output shutdown; reapply input power to recover Overtemperature recovery Output shutdown; reapply input power to recover Input undervoltage turn-on specification ≥67.2 VDC Input undervoltage turn-off specification ≤65 VDC Input undervoltage recovery Automatic when the input rises above the operating threshold Internal input fuse reference 2 × Conquer MST, 6.3 A, 250 V; time-lag The catalogue loading example shows 400.8 W for 100 seconds followed by 601.2 W for 5 seconds. These are conditional pulse-load patterns; peak power is not a continuous rating. Apply the peak-temperature curve as well as the continuous-load limits. After the initial peak interval, a sustained overload enters the specified constant-current protection region. Keep planned peaks within 5 seconds; the overload-protection response does not authorize a longer peak interval. Two MOSFETs in series with the negative input prevent output when input polarity is reversed. Correct the polarity before restoring operation. A start-up resistor limits inrush current and is then bypassed by MOSFETs. The fuse references identify internal protection components; they are not an external fuse-selection instruction. Current Sharing Maximum parallel units 4 Output-voltage matching Difference strictly less than 0.2 V Total output-current limit Rated current per unit × number of units × 0.9 Minimum parallel load Strictly greater than 3% × rated current per unit × number of units Four-unit current limit at the stated unit ratings 120.24 A Current-sharing connections Connect P+ to P+ and P− to P− across all participating units The series specification describes current sharing up to 1920 W (3+1 units). Size the usable load with the 0.9 current formula, the actual model rating and all applicable derating conditions. The headline aggregate rating is not an unconditional usable load or N+1 capacity guarantee. Use matching output-voltage units, connect the outputs and sharing terminals as illustrated, and adjust their output-voltage differences to less than 0.2 V. Consult the manufacturer for arrangements beyond four units. DC OK Relay and Remote ON/OFF DC OK contact closed Power supply on / DC OK DC OK contact open Power supply off / DC fail Maximum DC OK contact rating 30 VDC, 1 A resistive load Remote-control terminals TB1 pin 4 relative to TB1 pin 2 (−Vin) Output ON Remote input open, or 5.5–10 VDC Output OFF Remote input shorted, or 0–0.8 VDC Front-panel indication DC OK indicator Observe the relay contact rating when connecting an external monitoring circuit. Remote ON/OFF controls the converter output; disconnect the DC input before installing or servicing wiring. Terminal Assignment and Wiring TB1 pin 1 FG / protective earth TB1 pin 2 DC input −Vin TB1 pin 3 DC input +Vin TB1 pin 4 Remote ON/OFF TB2 pins 1, 2 DC output +Vo TB2 pins 3, 4 DC output −Vo TB2 pins 5, 6 DC OK relay contact TB2 pin 7 P+ current sharing TB2 pin 8 P− current sharing Observe the numbered terminals in the mechanical drawing. Connect FG to the installation protective-earth system and size the DC conductors and terminations for this model’s input and output currents. Keep the DC OK contacts separate from the DC power and current-sharing connections. Allow access to the terminals, Vo Adj. control and rail latch after installation. Cooling, Temperature and Input Derating Cooling Free-air convection; fanless Required orientation for the published curves Vertical Working ambient range −40 to +80°C, subject to derating Continuous-load temperature curve 100% through 60°C; reduce along the plotted line to 40% at 80°C Full 150% peak temperature range −40 to +60°C, within the peak-duration limit Load at minimum continuous input 90% Input for 100% load 86.4 VDC and above within the continuous input range Operating altitude Up to 5000 m; overvoltage category II Altitude temperature derating Above 2000 m: reduce permitted ambient temperature by 3.5°C per additional 1000 m Input-voltage and temperature limits apply together. At low input, follow the rising input-derating line between the minimum continuous voltage and the full-load input point; short-duration input operation is not a full-load continuous extension. Above 60°C, reduce the allowed 5-second peak along its separate upper curve to 40% load at 80°C. The model-specific continuous-load curve remains a separate constraint. Provide unobstructed airflow around the installed converter. Do not treat the ambient range, peak capability or altitude statement as an unconditional full-load rating. Environmental and Mechanical Data Working humidity 5–95% RH, non-condensing Storage temperature / humidity −40 to +85°C; 5–95% RH, non-condensing Temperature coefficient ±0.03%/°C over 0–55°C Component vibration 10–500 Hz, 5 G; 10 minutes per cycle; 60 minutes on each X, Y and Z axis Vibration mounting requirement Compliance with IEC 61373 Catalogue body dimensions, W × H × D 85.5 × 125.2 × 129.2 mm Case reference 984F Drawing tolerance ±1 mm DIN rail compatibility TS35/7.5 or TS35/15 Rail supply status Reference rail shown; not included with the unit Unit mass, catalogue PACKING reference 1375 g Catalogue packing 1.375 kg; 8 units / 12 kg / 0.95 CUFT Minimum MTBF 750.3K hours, Telcordia SR-332 (Bellcore); 101.7K hours, MIL-HDBK-217F at 25°C Nominal switching frequency 65 kHz Catalogue warranty 3 years Use the illustrated DIN rail mounting and removal arrangement. The body dimensions do not include the installed rail, external wiring or cable-bend clearance. Select the rail and installation hardware for the enclosure. The listed mass is the explicit per-unit catalogue packing reference; it is not a measured installation mass or the gross mass of an individual shipping box. Safety, Isolation and EMC Catalogue-listed safety approvals IEC 62368-1; UL 62368-1; AS/NZS 62368-1; EAC TP TC 004 Input-to-output isolation 4 kVDC; reinforced isolation Input-to-FG withstand voltage 2.5 kVDC Output-to-FG withstand voltage 0.71 kVDC Isolation resistance >100 MΩ between input–output, input–FG and output–FG at 500 VDC, 25°C and 70% RH Conducted emissions BS EN / EN 55032, Class A Radiated emissions BS EN / EN 55032, Class B Immunity standards BS EN / EN 55035 Railway standards BS EN / EN 50155; IEC 60571; IEC 61373 shock and vibration; BS EN / EN 50121-3-2 EMC; BS EN / EN 45545-2 fire protection The six listed immunity tests use criterion A: ESD level 3 at 8 kV air and 6 kV contact; radiated RF level 3 at 10 V/m; EFT/burst level 3 at 2 kV; surge level 3 at 1 kV line–line and 2 kV line–line–FG; conducted RF level 3 at 10 V; and magnetic field level 4 at 30 A/m. The emissions table names BS EN / EN 61000-3-3 for voltage flicker without a numerical test level; it does not specify a harmonic-current limit. Confirm EMC compliance of the complete equipment after integration. Railway Environmental and Fire Tests The catalogue reports PASS for EN 50155 dry heat (section 13.4.5: 70°C for 6 hours and 85°C for 10 minutes); cyclic damp heat (13.4.8: 25–55°C, 90–100% RH, 48 hours); vibration (13.4.10: 19°C, 65% RH, 10 minutes); shock (13.4.10: 21 ±3°C, 65 ±5% RH, 30 ms ×18); low-temperature storage (13.4.6: −40°C, 16 hours); and salt mist (13.4.13: 35 ±2°C, 96 hours). These test conditions do not expand continuous operating limits. EN 45545-2:2020 results are marked PASS at HL1, HL2 and HL3 for all listed items: PCB R22 oxygen index, smoke density and smoke toxicity; PCB R24 oxygen index; PCB R25 glow-wire; potting R24 oxygen index; and terminal-block R26 vertical flame. Test methods are EN ISO 4589-2:2017, EN ISO 5659-2:2017, EN 17084:2018, EN 60695-2-11:2014 and EN 60695-11-10:2013 as applicable. Component results do not certify the entire vehicle or equipment.

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  MEAN WELL DDR-480 series: DIN Rail DC/DC Converter - DDR-480C-24

  The MEAN WELL DDR-480C-24 is a fanless DIN rail DC/DC converter rated at 24 V, 20 A and 480 W. Its C-code input supports 33.6–67.2 VDC continuously, with a separate 28.8–33.6 VDC band for 100 ms. The metal enclosure provides reinforced 4 kVDC input-to-output isolation, adjustable output, a DC OK relay, remote ON/OFF and active current sharing. A 720 W peak is available for up to 5 seconds under the specified temperature and loading conditions. Product Datasheet Download MEAN WELL DDR-480 Datasheet (PDF) The DDR-480 section is on PDF pages 32, 33, 34, 35, 36, 37, 38, 39, 40. Refer to the complete mechanical drawings and notes when planning installation. Model and Output Ratings Full model DDR-480C-24 Series DDR-480 Input code C DC output voltage 24 V Rated output current 20 A Rated output power 480 W Output current range 0–20 A Output voltage adjustment range 24–28 V Peak output current 30 A Peak output power 720 W Peak duration 5 seconds maximum Maximum ripple and noise 120 mVp-p Voltage tolerance ±1.0% Line regulation ±0.5% Load regulation ±1.0% Adjust the output with the front-panel Vo Adj. control and retain the current, power and thermal limits. The adjustment range is the specified voltage interval. Suitable applications include railway and industrial control, security, factory automation and telecommunications. The converter can provide DC voltage conversion, additional input/output insulation and compensation for cable voltage drop within its adjustment range. Input and Hold-up Performance Continuous DC input range 33.6–67.2 VDC 100 ms input range 28.8–33.6 VDC Reference DC input 48 VDC Typical efficiency 92% Typical DC input current 11.2 A at 48 VDC Typical inrush current 30 A Set-up / rise time 500 / 60 ms Minimum hold-up at 100% load 11 ms at 48 VDC Minimum hold-up at 70% load 17 ms at 48 VDC Supply interruption classification EN 50155:2021, S2; 10 ms at full load Normal measurement conditions 48 VDC input, rated load and 25°C ambient The 100 ms low-input band is a short-duration condition and does not extend the continuous input range. Apply the separate input-voltage derating curve before selecting the load. Use the dedicated model hold-up-versus-load curve for other load levels. A larger hold-up duration at reduced load is not a full-load rating. Ripple and noise are measured at 20 MHz bandwidth using a 12-inch twisted pair terminated by parallel 0.1 µF and 47 µF capacitors. Voltage tolerance includes set-up tolerance, line regulation and load regulation. Peak Loading and Protection Peak loading capability 150% of the model rated output power for the stated peak duration Protection functions Short circuit, overload, overvoltage, overtemperature, input reverse polarity and input undervoltage Sustained overload response Constant-current limiting at 105–135% of rated output power; automatic recovery after the overload is removed Overvoltage threshold 28.8–35 V Overvoltage recovery Output shutdown; reapply input power to recover Overtemperature recovery Output shutdown; reapply input power to recover Input undervoltage turn-on specification ≥33.6 VDC Input undervoltage turn-off specification ≤33 VDC Input undervoltage recovery Automatic when the input rises above the operating threshold Internal input fuse reference 3 × Conquer MST, 8 A, 250 V; time-lag The catalogue loading example shows 480 W for 100 seconds followed by 720 W for 5 seconds. These are conditional pulse-load patterns; peak power is not a continuous rating. Apply the peak-temperature curve as well as the continuous-load limits. After the initial peak interval, a sustained overload enters the specified constant-current protection region. Keep planned peaks within 5 seconds; the overload-protection response does not authorize a longer peak interval. Two MOSFETs in series with the negative input prevent output when input polarity is reversed. Correct the polarity before restoring operation. A start-up resistor limits inrush current and is then bypassed by MOSFETs. The fuse references identify internal protection components; they are not an external fuse-selection instruction. Current Sharing Maximum parallel units 4 Output-voltage matching Difference strictly less than 0.2 V Total output-current limit Rated current per unit × number of units × 0.9 Minimum parallel load Strictly greater than 3% × rated current per unit × number of units Four-unit current limit at the stated unit ratings 72 A Current-sharing connections Connect P+ to P+ and P− to P− across all participating units The series specification describes current sharing up to 1920 W (3+1 units). Size the usable load with the 0.9 current formula, the actual model rating and all applicable derating conditions. The headline aggregate rating is not an unconditional usable load or N+1 capacity guarantee. Use matching output-voltage units, connect the outputs and sharing terminals as illustrated, and adjust their output-voltage differences to less than 0.2 V. Consult the manufacturer for arrangements beyond four units. DC OK Relay and Remote ON/OFF DC OK contact closed Power supply on / DC OK DC OK contact open Power supply off / DC fail Maximum DC OK contact rating 30 VDC, 1 A resistive load Remote-control terminals TB1 pin 4 relative to TB1 pin 2 (−Vin) Output ON Remote input open, or 5.5–10 VDC Output OFF Remote input shorted, or 0–0.8 VDC Front-panel indication DC OK indicator Observe the relay contact rating when connecting an external monitoring circuit. Remote ON/OFF controls the converter output; disconnect the DC input before installing or servicing wiring. Terminal Assignment and Wiring TB1 pin 1 FG / protective earth TB1 pin 2 DC input −Vin TB1 pin 3 DC input +Vin TB1 pin 4 Remote ON/OFF TB2 pins 1, 2 DC output +Vo TB2 pins 3, 4 DC output −Vo TB2 pins 5, 6 DC OK relay contact TB2 pin 7 P+ current sharing TB2 pin 8 P− current sharing Observe the numbered terminals in the mechanical drawing. Connect FG to the installation protective-earth system and size the DC conductors and terminations for this model’s input and output currents. Keep the DC OK contacts separate from the DC power and current-sharing connections. Allow access to the terminals, Vo Adj. control and rail latch after installation. Cooling, Temperature and Input Derating Cooling Free-air convection; fanless Required orientation for the published curves Vertical Working ambient range −40 to +80°C, subject to derating Continuous-load temperature curve 100% through 55°C; reduce along the plotted line to 40% at 80°C Full 150% peak temperature range −40 to +60°C, within the peak-duration limit Load at minimum continuous input 90% Input for 100% load 43.2 VDC and above within the continuous input range Operating altitude Up to 5000 m; overvoltage category II Altitude temperature derating Above 2000 m: reduce permitted ambient temperature by 3.5°C per additional 1000 m Input-voltage and temperature limits apply together. At low input, follow the rising input-derating line between the minimum continuous voltage and the full-load input point; short-duration input operation is not a full-load continuous extension. Above 60°C, reduce the allowed 5-second peak along its separate upper curve to 40% load at 80°C. The model-specific continuous-load curve remains a separate constraint. Provide unobstructed airflow around the installed converter. Do not treat the ambient range, peak capability or altitude statement as an unconditional full-load rating. Environmental and Mechanical Data Working humidity 5–95% RH, non-condensing Storage temperature / humidity −40 to +85°C; 5–95% RH, non-condensing Temperature coefficient ±0.03%/°C over 0–55°C Component vibration 10–500 Hz, 5 G; 10 minutes per cycle; 60 minutes on each X, Y and Z axis Vibration mounting requirement Compliance with IEC 61373 Catalogue body dimensions, W × H × D 85.5 × 125.2 × 129.2 mm Case reference 984F Drawing tolerance ±1 mm DIN rail compatibility TS35/7.5 or TS35/15 Rail supply status Reference rail shown; not included with the unit Unit mass, catalogue PACKING reference 1375 g Catalogue packing 1.375 kg; 8 units / 12 kg / 0.95 CUFT Minimum MTBF 750.3K hours, Telcordia SR-332 (Bellcore); 101.7K hours, MIL-HDBK-217F at 25°C Nominal switching frequency 65 kHz Catalogue warranty 3 years Use the illustrated DIN rail mounting and removal arrangement. The body dimensions do not include the installed rail, external wiring or cable-bend clearance. Select the rail and installation hardware for the enclosure. The listed mass is the explicit per-unit catalogue packing reference; it is not a measured installation mass or the gross mass of an individual shipping box. Safety, Isolation and EMC Catalogue-listed safety approvals IEC 62368-1; UL 62368-1; AS/NZS 62368-1; EAC TP TC 004 Input-to-output isolation 4 kVDC; reinforced isolation Input-to-FG withstand voltage 2.5 kVDC Output-to-FG withstand voltage 0.71 kVDC Isolation resistance >100 MΩ between input–output, input–FG and output–FG at 500 VDC, 25°C and 70% RH Conducted emissions BS EN / EN 55032, Class A Radiated emissions BS EN / EN 55032, Class B Immunity standards BS EN / EN 55035 Railway standards BS EN / EN 50155; IEC 60571; IEC 61373 shock and vibration; BS EN / EN 50121-3-2 EMC; BS EN / EN 45545-2 fire protection The six listed immunity tests use criterion A: ESD level 3 at 8 kV air and 6 kV contact; radiated RF level 3 at 10 V/m; EFT/burst level 3 at 2 kV; surge level 3 at 1 kV line–line and 2 kV line–line–FG; conducted RF level 3 at 10 V; and magnetic field level 4 at 30 A/m. The emissions table names BS EN / EN 61000-3-3 for voltage flicker without a numerical test level; it does not specify a harmonic-current limit. Confirm EMC compliance of the complete equipment after integration. Railway Environmental and Fire Tests The catalogue reports PASS for EN 50155 dry heat (section 13.4.5: 70°C for 6 hours and 85°C for 10 minutes); cyclic damp heat (13.4.8: 25–55°C, 90–100% RH, 48 hours); vibration (13.4.10: 19°C, 65% RH, 10 minutes); shock (13.4.10: 21 ±3°C, 65 ±5% RH, 30 ms ×18); low-temperature storage (13.4.6: −40°C, 16 hours); and salt mist (13.4.13: 35 ±2°C, 96 hours). These test conditions do not expand continuous operating limits. EN 45545-2:2020 results are marked PASS at HL1, HL2 and HL3 for all listed items: PCB R22 oxygen index, smoke density and smoke toxicity; PCB R24 oxygen index; PCB R25 glow-wire; potting R24 oxygen index; and terminal-block R26 vertical flame. Test methods are EN ISO 4589-2:2017, EN ISO 5659-2:2017, EN 17084:2018, EN 60695-2-11:2014 and EN 60695-11-10:2013 as applicable. Component results do not certify the entire vehicle or equipment.

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  MEAN WELL DDR-480 series: DIN Rail DC/DC Converter - DDR-480C-12

  The MEAN WELL DDR-480C-12 is a fanless DIN rail DC/DC converter rated at 12 V, 33.4 A and 400.8 W. Its C-code input supports 33.6–67.2 VDC continuously, with a separate 28.8–33.6 VDC band for 100 ms. The metal enclosure provides reinforced 4 kVDC input-to-output isolation, adjustable output, a DC OK relay, remote ON/OFF and active current sharing. A 601.2 W peak is available for up to 5 seconds under the specified temperature and loading conditions. Product Datasheet Download MEAN WELL DDR-480 Datasheet (PDF) The DDR-480 section is on PDF pages 32, 33, 34, 35, 36, 37, 38, 39, 40. Refer to the complete mechanical drawings and notes when planning installation. Model and Output Ratings Full model DDR-480C-12 Series DDR-480 Input code C DC output voltage 12 V Rated output current 33.4 A Rated output power 400.8 W Output current range 0–33.4 A Output voltage adjustment range 12–14 V Peak output current 50.1 A Peak output power 601.2 W Peak duration 5 seconds maximum Maximum ripple and noise 100 mVp-p Voltage tolerance ±1.0% Line regulation ±0.5% Load regulation ±1.0% Adjust the output with the front-panel Vo Adj. control and retain the current, power and thermal limits. The adjustment range is the specified voltage interval. Suitable applications include railway and industrial control, security, factory automation and telecommunications. The converter can provide DC voltage conversion, additional input/output insulation and compensation for cable voltage drop within its adjustment range. Input and Hold-up Performance Continuous DC input range 33.6–67.2 VDC 100 ms input range 28.8–33.6 VDC Reference DC input 48 VDC Typical efficiency 91% Typical DC input current 11.2 A at 48 VDC Typical inrush current 30 A Set-up / rise time 500 / 60 ms Minimum hold-up at 100% load 11 ms at 48 VDC Minimum hold-up at 70% load 17 ms at 48 VDC Supply interruption classification EN 50155:2021, S2; 10 ms at full load Normal measurement conditions 48 VDC input, rated load and 25°C ambient The 100 ms low-input band is a short-duration condition and does not extend the continuous input range. Apply the separate input-voltage derating curve before selecting the load. Use the dedicated model hold-up-versus-load curve for other load levels. A larger hold-up duration at reduced load is not a full-load rating. Ripple and noise are measured at 20 MHz bandwidth using a 12-inch twisted pair terminated by parallel 0.1 µF and 47 µF capacitors. Voltage tolerance includes set-up tolerance, line regulation and load regulation. Peak Loading and Protection Peak loading capability 150% of the model rated output power for the stated peak duration Protection functions Short circuit, overload, overvoltage, overtemperature, input reverse polarity and input undervoltage Sustained overload response Constant-current limiting at 105–135% of rated output power; automatic recovery after the overload is removed Overvoltage threshold 14.4–17.5 V Overvoltage recovery Output shutdown; reapply input power to recover Overtemperature recovery Output shutdown; reapply input power to recover Input undervoltage turn-on specification ≥33.6 VDC Input undervoltage turn-off specification ≤33 VDC Input undervoltage recovery Automatic when the input rises above the operating threshold Internal input fuse reference 3 × Conquer MST, 8 A, 250 V; time-lag The catalogue loading example shows 400.8 W for 100 seconds followed by 601.2 W for 5 seconds. These are conditional pulse-load patterns; peak power is not a continuous rating. Apply the peak-temperature curve as well as the continuous-load limits. After the initial peak interval, a sustained overload enters the specified constant-current protection region. Keep planned peaks within 5 seconds; the overload-protection response does not authorize a longer peak interval. Two MOSFETs in series with the negative input prevent output when input polarity is reversed. Correct the polarity before restoring operation. A start-up resistor limits inrush current and is then bypassed by MOSFETs. The fuse references identify internal protection components; they are not an external fuse-selection instruction. Current Sharing Maximum parallel units 4 Output-voltage matching Difference strictly less than 0.2 V Total output-current limit Rated current per unit × number of units × 0.9 Minimum parallel load Strictly greater than 3% × rated current per unit × number of units Four-unit current limit at the stated unit ratings 120.24 A Current-sharing connections Connect P+ to P+ and P− to P− across all participating units The series specification describes current sharing up to 1920 W (3+1 units). Size the usable load with the 0.9 current formula, the actual model rating and all applicable derating conditions. The headline aggregate rating is not an unconditional usable load or N+1 capacity guarantee. Use matching output-voltage units, connect the outputs and sharing terminals as illustrated, and adjust their output-voltage differences to less than 0.2 V. Consult the manufacturer for arrangements beyond four units. DC OK Relay and Remote ON/OFF DC OK contact closed Power supply on / DC OK DC OK contact open Power supply off / DC fail Maximum DC OK contact rating 30 VDC, 1 A resistive load Remote-control terminals TB1 pin 4 relative to TB1 pin 2 (−Vin) Output ON Remote input open, or 5.5–10 VDC Output OFF Remote input shorted, or 0–0.8 VDC Front-panel indication DC OK indicator Observe the relay contact rating when connecting an external monitoring circuit. Remote ON/OFF controls the converter output; disconnect the DC input before installing or servicing wiring. Terminal Assignment and Wiring TB1 pin 1 FG / protective earth TB1 pin 2 DC input −Vin TB1 pin 3 DC input +Vin TB1 pin 4 Remote ON/OFF TB2 pins 1, 2 DC output +Vo TB2 pins 3, 4 DC output −Vo TB2 pins 5, 6 DC OK relay contact TB2 pin 7 P+ current sharing TB2 pin 8 P− current sharing Observe the numbered terminals in the mechanical drawing. Connect FG to the installation protective-earth system and size the DC conductors and terminations for this model’s input and output currents. Keep the DC OK contacts separate from the DC power and current-sharing connections. Allow access to the terminals, Vo Adj. control and rail latch after installation. Cooling, Temperature and Input Derating Cooling Free-air convection; fanless Required orientation for the published curves Vertical Working ambient range −40 to +80°C, subject to derating Continuous-load temperature curve 100% through 60°C; reduce along the plotted line to 40% at 80°C Full 150% peak temperature range −40 to +60°C, within the peak-duration limit Load at minimum continuous input 90% Input for 100% load 43.2 VDC and above within the continuous input range Operating altitude Up to 5000 m; overvoltage category II Altitude temperature derating Above 2000 m: reduce permitted ambient temperature by 3.5°C per additional 1000 m Input-voltage and temperature limits apply together. At low input, follow the rising input-derating line between the minimum continuous voltage and the full-load input point; short-duration input operation is not a full-load continuous extension. Above 60°C, reduce the allowed 5-second peak along its separate upper curve to 40% load at 80°C. The model-specific continuous-load curve remains a separate constraint. Provide unobstructed airflow around the installed converter. Do not treat the ambient range, peak capability or altitude statement as an unconditional full-load rating. Environmental and Mechanical Data Working humidity 5–95% RH, non-condensing Storage temperature / humidity −40 to +85°C; 5–95% RH, non-condensing Temperature coefficient ±0.03%/°C over 0–55°C Component vibration 10–500 Hz, 5 G; 10 minutes per cycle; 60 minutes on each X, Y and Z axis Vibration mounting requirement Compliance with IEC 61373 Catalogue body dimensions, W × H × D 85.5 × 125.2 × 129.2 mm Case reference 984F Drawing tolerance ±1 mm DIN rail compatibility TS35/7.5 or TS35/15 Rail supply status Reference rail shown; not included with the unit Unit mass, catalogue PACKING reference 1375 g Catalogue packing 1.375 kg; 8 units / 12 kg / 0.95 CUFT Minimum MTBF 750.3K hours, Telcordia SR-332 (Bellcore); 101.7K hours, MIL-HDBK-217F at 25°C Nominal switching frequency 65 kHz Catalogue warranty 3 years Use the illustrated DIN rail mounting and removal arrangement. The body dimensions do not include the installed rail, external wiring or cable-bend clearance. Select the rail and installation hardware for the enclosure. The listed mass is the explicit per-unit catalogue packing reference; it is not a measured installation mass or the gross mass of an individual shipping box. Safety, Isolation and EMC Catalogue-listed safety approvals IEC 62368-1; UL 62368-1; AS/NZS 62368-1; EAC TP TC 004 Input-to-output isolation 4 kVDC; reinforced isolation Input-to-FG withstand voltage 2.5 kVDC Output-to-FG withstand voltage 0.71 kVDC Isolation resistance >100 MΩ between input–output, input–FG and output–FG at 500 VDC, 25°C and 70% RH Conducted emissions BS EN / EN 55032, Class A Radiated emissions BS EN / EN 55032, Class B Immunity standards BS EN / EN 55035 Railway standards BS EN / EN 50155; IEC 60571; IEC 61373 shock and vibration; BS EN / EN 50121-3-2 EMC; BS EN / EN 45545-2 fire protection The six listed immunity tests use criterion A: ESD level 3 at 8 kV air and 6 kV contact; radiated RF level 3 at 10 V/m; EFT/burst level 3 at 2 kV; surge level 3 at 1 kV line–line and 2 kV line–line–FG; conducted RF level 3 at 10 V; and magnetic field level 4 at 30 A/m. The emissions table names BS EN / EN 61000-3-3 for voltage flicker without a numerical test level; it does not specify a harmonic-current limit. Confirm EMC compliance of the complete equipment after integration. Railway Environmental and Fire Tests The catalogue reports PASS for EN 50155 dry heat (section 13.4.5: 70°C for 6 hours and 85°C for 10 minutes); cyclic damp heat (13.4.8: 25–55°C, 90–100% RH, 48 hours); vibration (13.4.10: 19°C, 65% RH, 10 minutes); shock (13.4.10: 21 ±3°C, 65 ±5% RH, 30 ms ×18); low-temperature storage (13.4.6: −40°C, 16 hours); and salt mist (13.4.13: 35 ±2°C, 96 hours). These test conditions do not expand continuous operating limits. EN 45545-2:2020 results are marked PASS at HL1, HL2 and HL3 for all listed items: PCB R22 oxygen index, smoke density and smoke toxicity; PCB R24 oxygen index; PCB R25 glow-wire; potting R24 oxygen index; and terminal-block R26 vertical flame. Test methods are EN ISO 4589-2:2017, EN ISO 5659-2:2017, EN 17084:2018, EN 60695-2-11:2014 and EN 60695-11-10:2013 as applicable. Component results do not certify the entire vehicle or equipment.

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  MEAN WELL DDR-480 series: DIN Rail DC/DC Converter - DDR-480B-48

  The MEAN WELL DDR-480B-48 is a fanless DIN rail DC/DC converter rated at 48 V, 10 A and 480 W. Its B-code input supports 16.8–33.6 VDC continuously, with a separate 14.4–16.8 VDC band for 100 ms. The metal enclosure provides reinforced 4 kVDC input-to-output isolation, adjustable output, a DC OK relay, remote ON/OFF and active current sharing. A 720 W peak is available for up to 5 seconds under the specified temperature and loading conditions. Product Datasheet Download MEAN WELL DDR-480 Datasheet (PDF) The DDR-480 section is on PDF pages 32, 33, 34, 35, 36, 37, 38, 39, 40. Refer to the complete mechanical drawings and notes when planning installation. Model and Output Ratings Full model DDR-480B-48 Series DDR-480 Input code B DC output voltage 48 V Rated output current 10 A Rated output power 480 W Output current range 0–10 A Output voltage adjustment range 48–56 V Peak output current 15 A Peak output power 720 W Peak duration 5 seconds maximum Maximum ripple and noise 150 mVp-p Voltage tolerance ±1.0% Line regulation ±0.5% Load regulation ±1.0% Adjust the output with the front-panel Vo Adj. control and retain the current, power and thermal limits. The adjustment range is the specified voltage interval. Suitable applications include railway and industrial control, security, factory automation and telecommunications. The converter can provide DC voltage conversion, additional input/output insulation and compensation for cable voltage drop within its adjustment range. Input and Hold-up Performance Continuous DC input range 16.8–33.6 VDC 100 ms input range 14.4–16.8 VDC Reference DC input 24 VDC Typical efficiency 90.5% Typical DC input current 23 A at 24 VDC Typical inrush current 30 A Set-up / rise time 500 / 60 ms Minimum hold-up at 100% load 10 ms at 24 VDC Minimum hold-up at 70% load 16 ms at 24 VDC Supply interruption classification EN 50155:2021, S2; 10 ms at full load Normal measurement conditions 24 VDC input, rated load and 25°C ambient The 100 ms low-input band is a short-duration condition and does not extend the continuous input range. Apply the separate input-voltage derating curve before selecting the load. Use the dedicated model hold-up-versus-load curve for other load levels. A larger hold-up duration at reduced load is not a full-load rating. Ripple and noise are measured at 20 MHz bandwidth using a 12-inch twisted pair terminated by parallel 0.1 µF and 47 µF capacitors. Voltage tolerance includes set-up tolerance, line regulation and load regulation. Peak Loading and Protection Peak loading capability 150% of the model rated output power for the stated peak duration Protection functions Short circuit, overload, overvoltage, overtemperature, input reverse polarity and input undervoltage Sustained overload response Constant-current limiting at 105–135% of rated output power; automatic recovery after the overload is removed Overvoltage threshold 57.6–65 V Overvoltage recovery Output shutdown; reapply input power to recover Overtemperature recovery Output shutdown; reapply input power to recover Input undervoltage turn-on specification ≥16.8 VDC Input undervoltage turn-off specification ≤16.5 VDC Input undervoltage recovery Automatic when the input rises above the operating threshold Internal input fuse reference 5 × Conquer MST, 10 A, 250 V; time-lag The catalogue loading example shows 480 W for 100 seconds followed by 720 W for 5 seconds. These are conditional pulse-load patterns; peak power is not a continuous rating. Apply the peak-temperature curve as well as the continuous-load limits. After the initial peak interval, a sustained overload enters the specified constant-current protection region. Keep planned peaks within 5 seconds; the overload-protection response does not authorize a longer peak interval. Two MOSFETs in series with the negative input prevent output when input polarity is reversed. Correct the polarity before restoring operation. A start-up resistor limits inrush current and is then bypassed by MOSFETs. The fuse references identify internal protection components; they are not an external fuse-selection instruction. Current Sharing Maximum parallel units 4 Output-voltage matching Difference strictly less than 0.2 V Total output-current limit Rated current per unit × number of units × 0.9 Minimum parallel load Strictly greater than 3% × rated current per unit × number of units Four-unit current limit at the stated unit ratings 36 A Current-sharing connections Connect P+ to P+ and P− to P− across all participating units The series specification describes current sharing up to 1920 W (3+1 units). Size the usable load with the 0.9 current formula, the actual model rating and all applicable derating conditions. The headline aggregate rating is not an unconditional usable load or N+1 capacity guarantee. Use matching output-voltage units, connect the outputs and sharing terminals as illustrated, and adjust their output-voltage differences to less than 0.2 V. Consult the manufacturer for arrangements beyond four units. DC OK Relay and Remote ON/OFF DC OK contact closed Power supply on / DC OK DC OK contact open Power supply off / DC fail Maximum DC OK contact rating 30 VDC, 1 A resistive load Remote-control terminals TB1 pin 4 relative to TB1 pin 2 (−Vin) Output ON Remote input open, or 5.5–10 VDC Output OFF Remote input shorted, or 0–0.8 VDC Front-panel indication DC OK indicator Observe the relay contact rating when connecting an external monitoring circuit. Remote ON/OFF controls the converter output; disconnect the DC input before installing or servicing wiring. Terminal Assignment and Wiring TB1 pin 1 FG / protective earth TB1 pin 2 DC input −Vin TB1 pin 3 DC input +Vin TB1 pin 4 Remote ON/OFF TB2 pins 1, 2 DC output +Vo TB2 pins 3, 4 DC output −Vo TB2 pins 5, 6 DC OK relay contact TB2 pin 7 P+ current sharing TB2 pin 8 P− current sharing Observe the numbered terminals in the mechanical drawing. Connect FG to the installation protective-earth system and size the DC conductors and terminations for this model’s input and output currents. Keep the DC OK contacts separate from the DC power and current-sharing connections. Allow access to the terminals, Vo Adj. control and rail latch after installation. Cooling, Temperature and Input Derating Cooling Free-air convection; fanless Required orientation for the published curves Vertical Working ambient range −40 to +80°C, subject to derating Continuous-load temperature curve 100% through 55°C; reduce along the plotted line to 40% at 80°C Full 150% peak temperature range −40 to +60°C, within the peak-duration limit Load at minimum continuous input 80% Input for 100% load 21.6 VDC and above within the continuous input range Operating altitude Up to 5000 m; overvoltage category II Altitude temperature derating Above 2000 m: reduce permitted ambient temperature by 3.5°C per additional 1000 m Input-voltage and temperature limits apply together. At low input, follow the rising input-derating line between the minimum continuous voltage and the full-load input point; short-duration input operation is not a full-load continuous extension. Above 60°C, reduce the allowed 5-second peak along its separate upper curve to 40% load at 80°C. The model-specific continuous-load curve remains a separate constraint. Provide unobstructed airflow around the installed converter. Do not treat the ambient range, peak capability or altitude statement as an unconditional full-load rating. Environmental and Mechanical Data Working humidity 5–95% RH, non-condensing Storage temperature / humidity −40 to +85°C; 5–95% RH, non-condensing Temperature coefficient ±0.03%/°C over 0–55°C Component vibration 10–500 Hz, 5 G; 10 minutes per cycle; 60 minutes on each X, Y and Z axis Vibration mounting requirement Compliance with IEC 61373 Catalogue body dimensions, W × H × D 85.5 × 125.2 × 129.2 mm Case reference 984F Drawing tolerance ±1 mm DIN rail compatibility TS35/7.5 or TS35/15 Rail supply status Reference rail shown; not included with the unit Unit mass, catalogue PACKING reference 1375 g Catalogue packing 1.375 kg; 8 units / 12 kg / 0.95 CUFT Minimum MTBF 750.3K hours, Telcordia SR-332 (Bellcore); 101.7K hours, MIL-HDBK-217F at 25°C Nominal switching frequency 65 kHz Catalogue warranty 3 years Use the illustrated DIN rail mounting and removal arrangement. The body dimensions do not include the installed rail, external wiring or cable-bend clearance. Select the rail and installation hardware for the enclosure. The listed mass is the explicit per-unit catalogue packing reference; it is not a measured installation mass or the gross mass of an individual shipping box. Safety, Isolation and EMC Catalogue-listed safety approvals IEC 62368-1; UL 62368-1; AS/NZS 62368-1; EAC TP TC 004 Input-to-output isolation 4 kVDC; reinforced isolation Input-to-FG withstand voltage 2.5 kVDC Output-to-FG withstand voltage 0.71 kVDC Isolation resistance >100 MΩ between input–output, input–FG and output–FG at 500 VDC, 25°C and 70% RH Conducted emissions BS EN / EN 55032, Class A Radiated emissions BS EN / EN 55032, Class B Immunity standards BS EN / EN 55035 Railway standards BS EN / EN 50155; IEC 60571; IEC 61373 shock and vibration; BS EN / EN 50121-3-2 EMC; BS EN / EN 45545-2 fire protection The six listed immunity tests use criterion A: ESD level 3 at 8 kV air and 6 kV contact; radiated RF level 3 at 10 V/m; EFT/burst level 3 at 2 kV; surge level 3 at 1 kV line–line and 2 kV line–line–FG; conducted RF level 3 at 10 V; and magnetic field level 4 at 30 A/m. The emissions table names BS EN / EN 61000-3-3 for voltage flicker without a numerical test level; it does not specify a harmonic-current limit. Confirm EMC compliance of the complete equipment after integration. Railway Environmental and Fire Tests The catalogue reports PASS for EN 50155 dry heat (section 13.4.5: 70°C for 6 hours and 85°C for 10 minutes); cyclic damp heat (13.4.8: 25–55°C, 90–100% RH, 48 hours); vibration (13.4.10: 19°C, 65% RH, 10 minutes); shock (13.4.10: 21 ±3°C, 65 ±5% RH, 30 ms ×18); low-temperature storage (13.4.6: −40°C, 16 hours); and salt mist (13.4.13: 35 ±2°C, 96 hours). These test conditions do not expand continuous operating limits. EN 45545-2:2020 results are marked PASS at HL1, HL2 and HL3 for all listed items: PCB R22 oxygen index, smoke density and smoke toxicity; PCB R24 oxygen index; PCB R25 glow-wire; potting R24 oxygen index; and terminal-block R26 vertical flame. Test methods are EN ISO 4589-2:2017, EN ISO 5659-2:2017, EN 17084:2018, EN 60695-2-11:2014 and EN 60695-11-10:2013 as applicable. Component results do not certify the entire vehicle or equipment.

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  MEAN WELL DDR-480 series: DIN Rail DC/DC Converter - DDR-480B-24

  The MEAN WELL DDR-480B-24 is a fanless DIN rail DC/DC converter rated at 24 V, 20 A and 480 W. Its B-code input supports 16.8–33.6 VDC continuously, with a separate 14.4–16.8 VDC band for 100 ms. The metal enclosure provides reinforced 4 kVDC input-to-output isolation, adjustable output, a DC OK relay, remote ON/OFF and active current sharing. A 720 W peak is available for up to 5 seconds under the specified temperature and loading conditions. Product Datasheet Download MEAN WELL DDR-480 Datasheet (PDF) The DDR-480 section is on PDF pages 32, 33, 34, 35, 36, 37, 38, 39, 40. Refer to the complete mechanical drawings and notes when planning installation. Model and Output Ratings Full model DDR-480B-24 Series DDR-480 Input code B DC output voltage 24 V Rated output current 20 A Rated output power 480 W Output current range 0–20 A Output voltage adjustment range 24–28 V Peak output current 30 A Peak output power 720 W Peak duration 5 seconds maximum Maximum ripple and noise 120 mVp-p Voltage tolerance ±1.0% Line regulation ±0.5% Load regulation ±1.0% Adjust the output with the front-panel Vo Adj. control and retain the current, power and thermal limits. The adjustment range is the specified voltage interval. Suitable applications include railway and industrial control, security, factory automation and telecommunications. The converter can provide DC voltage conversion, additional input/output insulation and compensation for cable voltage drop within its adjustment range. Input and Hold-up Performance Continuous DC input range 16.8–33.6 VDC 100 ms input range 14.4–16.8 VDC Reference DC input 24 VDC Typical efficiency 91% Typical DC input current 23 A at 24 VDC Typical inrush current 30 A Set-up / rise time 500 / 60 ms Minimum hold-up at 100% load 10 ms at 24 VDC Minimum hold-up at 70% load 16 ms at 24 VDC Supply interruption classification EN 50155:2021, S2; 10 ms at full load Normal measurement conditions 24 VDC input, rated load and 25°C ambient The 100 ms low-input band is a short-duration condition and does not extend the continuous input range. Apply the separate input-voltage derating curve before selecting the load. Use the dedicated model hold-up-versus-load curve for other load levels. A larger hold-up duration at reduced load is not a full-load rating. Ripple and noise are measured at 20 MHz bandwidth using a 12-inch twisted pair terminated by parallel 0.1 µF and 47 µF capacitors. Voltage tolerance includes set-up tolerance, line regulation and load regulation. Peak Loading and Protection Peak loading capability 150% of the model rated output power for the stated peak duration Protection functions Short circuit, overload, overvoltage, overtemperature, input reverse polarity and input undervoltage Sustained overload response Constant-current limiting at 105–135% of rated output power; automatic recovery after the overload is removed Overvoltage threshold 28.8–35 V Overvoltage recovery Output shutdown; reapply input power to recover Overtemperature recovery Output shutdown; reapply input power to recover Input undervoltage turn-on specification ≥16.8 VDC Input undervoltage turn-off specification ≤16.5 VDC Input undervoltage recovery Automatic when the input rises above the operating threshold Internal input fuse reference 5 × Conquer MST, 10 A, 250 V; time-lag The catalogue loading example shows 480 W for 100 seconds followed by 720 W for 5 seconds. These are conditional pulse-load patterns; peak power is not a continuous rating. Apply the peak-temperature curve as well as the continuous-load limits. After the initial peak interval, a sustained overload enters the specified constant-current protection region. Keep planned peaks within 5 seconds; the overload-protection response does not authorize a longer peak interval. Two MOSFETs in series with the negative input prevent output when input polarity is reversed. Correct the polarity before restoring operation. A start-up resistor limits inrush current and is then bypassed by MOSFETs. The fuse references identify internal protection components; they are not an external fuse-selection instruction. Current Sharing Maximum parallel units 4 Output-voltage matching Difference strictly less than 0.2 V Total output-current limit Rated current per unit × number of units × 0.9 Minimum parallel load Strictly greater than 3% × rated current per unit × number of units Four-unit current limit at the stated unit ratings 72 A Current-sharing connections Connect P+ to P+ and P− to P− across all participating units The series specification describes current sharing up to 1920 W (3+1 units). Size the usable load with the 0.9 current formula, the actual model rating and all applicable derating conditions. The headline aggregate rating is not an unconditional usable load or N+1 capacity guarantee. Use matching output-voltage units, connect the outputs and sharing terminals as illustrated, and adjust their output-voltage differences to less than 0.2 V. Consult the manufacturer for arrangements beyond four units. DC OK Relay and Remote ON/OFF DC OK contact closed Power supply on / DC OK DC OK contact open Power supply off / DC fail Maximum DC OK contact rating 30 VDC, 1 A resistive load Remote-control terminals TB1 pin 4 relative to TB1 pin 2 (−Vin) Output ON Remote input open, or 5.5–10 VDC Output OFF Remote input shorted, or 0–0.8 VDC Front-panel indication DC OK indicator Observe the relay contact rating when connecting an external monitoring circuit. Remote ON/OFF controls the converter output; disconnect the DC input before installing or servicing wiring. Terminal Assignment and Wiring TB1 pin 1 FG / protective earth TB1 pin 2 DC input −Vin TB1 pin 3 DC input +Vin TB1 pin 4 Remote ON/OFF TB2 pins 1, 2 DC output +Vo TB2 pins 3, 4 DC output −Vo TB2 pins 5, 6 DC OK relay contact TB2 pin 7 P+ current sharing TB2 pin 8 P− current sharing Observe the numbered terminals in the mechanical drawing. Connect FG to the installation protective-earth system and size the DC conductors and terminations for this model’s input and output currents. Keep the DC OK contacts separate from the DC power and current-sharing connections. Allow access to the terminals, Vo Adj. control and rail latch after installation. Cooling, Temperature and Input Derating Cooling Free-air convection; fanless Required orientation for the published curves Vertical Working ambient range −40 to +80°C, subject to derating Continuous-load temperature curve 100% through 55°C; reduce along the plotted line to 40% at 80°C Full 150% peak temperature range −40 to +60°C, within the peak-duration limit Load at minimum continuous input 80% Input for 100% load 21.6 VDC and above within the continuous input range Operating altitude Up to 5000 m; overvoltage category II Altitude temperature derating Above 2000 m: reduce permitted ambient temperature by 3.5°C per additional 1000 m Input-voltage and temperature limits apply together. At low input, follow the rising input-derating line between the minimum continuous voltage and the full-load input point; short-duration input operation is not a full-load continuous extension. Above 60°C, reduce the allowed 5-second peak along its separate upper curve to 40% load at 80°C. The model-specific continuous-load curve remains a separate constraint. Provide unobstructed airflow around the installed converter. Do not treat the ambient range, peak capability or altitude statement as an unconditional full-load rating. Environmental and Mechanical Data Working humidity 5–95% RH, non-condensing Storage temperature / humidity −40 to +85°C; 5–95% RH, non-condensing Temperature coefficient ±0.03%/°C over 0–55°C Component vibration 10–500 Hz, 5 G; 10 minutes per cycle; 60 minutes on each X, Y and Z axis Vibration mounting requirement Compliance with IEC 61373 Catalogue body dimensions, W × H × D 85.5 × 125.2 × 129.2 mm Case reference 984F Drawing tolerance ±1 mm DIN rail compatibility TS35/7.5 or TS35/15 Rail supply status Reference rail shown; not included with the unit Unit mass, catalogue PACKING reference 1375 g Catalogue packing 1.375 kg; 8 units / 12 kg / 0.95 CUFT Minimum MTBF 750.3K hours, Telcordia SR-332 (Bellcore); 101.7K hours, MIL-HDBK-217F at 25°C Nominal switching frequency 65 kHz Catalogue warranty 3 years Use the illustrated DIN rail mounting and removal arrangement. The body dimensions do not include the installed rail, external wiring or cable-bend clearance. Select the rail and installation hardware for the enclosure. The listed mass is the explicit per-unit catalogue packing reference; it is not a measured installation mass or the gross mass of an individual shipping box. Safety, Isolation and EMC Catalogue-listed safety approvals IEC 62368-1; UL 62368-1; AS/NZS 62368-1; EAC TP TC 004 Input-to-output isolation 4 kVDC; reinforced isolation Input-to-FG withstand voltage 2.5 kVDC Output-to-FG withstand voltage 0.71 kVDC Isolation resistance >100 MΩ between input–output, input–FG and output–FG at 500 VDC, 25°C and 70% RH Conducted emissions BS EN / EN 55032, Class A Radiated emissions BS EN / EN 55032, Class B Immunity standards BS EN / EN 55035 Railway standards BS EN / EN 50155; IEC 60571; IEC 61373 shock and vibration; BS EN / EN 50121-3-2 EMC; BS EN / EN 45545-2 fire protection The six listed immunity tests use criterion A: ESD level 3 at 8 kV air and 6 kV contact; radiated RF level 3 at 10 V/m; EFT/burst level 3 at 2 kV; surge level 3 at 1 kV line–line and 2 kV line–line–FG; conducted RF level 3 at 10 V; and magnetic field level 4 at 30 A/m. The emissions table names BS EN / EN 61000-3-3 for voltage flicker without a numerical test level; it does not specify a harmonic-current limit. Confirm EMC compliance of the complete equipment after integration. Railway Environmental and Fire Tests The catalogue reports PASS for EN 50155 dry heat (section 13.4.5: 70°C for 6 hours and 85°C for 10 minutes); cyclic damp heat (13.4.8: 25–55°C, 90–100% RH, 48 hours); vibration (13.4.10: 19°C, 65% RH, 10 minutes); shock (13.4.10: 21 ±3°C, 65 ±5% RH, 30 ms ×18); low-temperature storage (13.4.6: −40°C, 16 hours); and salt mist (13.4.13: 35 ±2°C, 96 hours). These test conditions do not expand continuous operating limits. EN 45545-2:2020 results are marked PASS at HL1, HL2 and HL3 for all listed items: PCB R22 oxygen index, smoke density and smoke toxicity; PCB R24 oxygen index; PCB R25 glow-wire; potting R24 oxygen index; and terminal-block R26 vertical flame. Test methods are EN ISO 4589-2:2017, EN ISO 5659-2:2017, EN 17084:2018, EN 60695-2-11:2014 and EN 60695-11-10:2013 as applicable. Component results do not certify the entire vehicle or equipment.

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  MEAN WELL DDR-480 series: DIN Rail DC/DC Converter - DDR-480B-12

  The MEAN WELL DDR-480B-12 is a fanless DIN rail DC/DC converter rated at 12 V, 33.4 A and 400.8 W. Its B-code input supports 16.8–33.6 VDC continuously, with a separate 14.4–16.8 VDC band for 100 ms. The metal enclosure provides reinforced 4 kVDC input-to-output isolation, adjustable output, a DC OK relay, remote ON/OFF and active current sharing. A 601.2 W peak is available for up to 5 seconds under the specified temperature and loading conditions. Product Datasheet Download MEAN WELL DDR-480 Datasheet (PDF) The DDR-480 section is on PDF pages 32, 33, 34, 35, 36, 37, 38, 39, 40. Refer to the complete mechanical drawings and notes when planning installation. Model and Output Ratings Full model DDR-480B-12 Series DDR-480 Input code B DC output voltage 12 V Rated output current 33.4 A Rated output power 400.8 W Output current range 0–33.4 A Output voltage adjustment range 12–14 V Peak output current 50.1 A Peak output power 601.2 W Peak duration 5 seconds maximum Maximum ripple and noise 100 mVp-p Voltage tolerance ±1.0% Line regulation ±0.5% Load regulation ±1.0% Adjust the output with the front-panel Vo Adj. control and retain the current, power and thermal limits. The adjustment range is the specified voltage interval. Suitable applications include railway and industrial control, security, factory automation and telecommunications. The converter can provide DC voltage conversion, additional input/output insulation and compensation for cable voltage drop within its adjustment range. Input and Hold-up Performance Continuous DC input range 16.8–33.6 VDC 100 ms input range 14.4–16.8 VDC Reference DC input 24 VDC Typical efficiency 90% Typical DC input current 23 A at 24 VDC Typical inrush current 30 A Set-up / rise time 500 / 60 ms Minimum hold-up at 100% load 10 ms at 24 VDC Minimum hold-up at 70% load 16 ms at 24 VDC Supply interruption classification EN 50155:2021, S2; 10 ms at full load Normal measurement conditions 24 VDC input, rated load and 25°C ambient The 100 ms low-input band is a short-duration condition and does not extend the continuous input range. Apply the separate input-voltage derating curve before selecting the load. Use the dedicated model hold-up-versus-load curve for other load levels. A larger hold-up duration at reduced load is not a full-load rating. Ripple and noise are measured at 20 MHz bandwidth using a 12-inch twisted pair terminated by parallel 0.1 µF and 47 µF capacitors. Voltage tolerance includes set-up tolerance, line regulation and load regulation. Peak Loading and Protection Peak loading capability 150% of the model rated output power for the stated peak duration Protection functions Short circuit, overload, overvoltage, overtemperature, input reverse polarity and input undervoltage Sustained overload response Constant-current limiting at 105–135% of rated output power; automatic recovery after the overload is removed Overvoltage threshold 14.4–17.5 V Overvoltage recovery Output shutdown; reapply input power to recover Overtemperature recovery Output shutdown; reapply input power to recover Input undervoltage turn-on specification ≥16.8 VDC Input undervoltage turn-off specification ≤16.5 VDC Input undervoltage recovery Automatic when the input rises above the operating threshold Internal input fuse reference 5 × Conquer MST, 10 A, 250 V; time-lag The catalogue loading example shows 400.8 W for 100 seconds followed by 601.2 W for 5 seconds. These are conditional pulse-load patterns; peak power is not a continuous rating. Apply the peak-temperature curve as well as the continuous-load limits. After the initial peak interval, a sustained overload enters the specified constant-current protection region. Keep planned peaks within 5 seconds; the overload-protection response does not authorize a longer peak interval. Two MOSFETs in series with the negative input prevent output when input polarity is reversed. Correct the polarity before restoring operation. A start-up resistor limits inrush current and is then bypassed by MOSFETs. The fuse references identify internal protection components; they are not an external fuse-selection instruction. Current Sharing Maximum parallel units 4 Output-voltage matching Difference strictly less than 0.2 V Total output-current limit Rated current per unit × number of units × 0.9 Minimum parallel load Strictly greater than 3% × rated current per unit × number of units Four-unit current limit at the stated unit ratings 120.24 A Current-sharing connections Connect P+ to P+ and P− to P− across all participating units The series specification describes current sharing up to 1920 W (3+1 units). Size the usable load with the 0.9 current formula, the actual model rating and all applicable derating conditions. The headline aggregate rating is not an unconditional usable load or N+1 capacity guarantee. Use matching output-voltage units, connect the outputs and sharing terminals as illustrated, and adjust their output-voltage differences to less than 0.2 V. Consult the manufacturer for arrangements beyond four units. DC OK Relay and Remote ON/OFF DC OK contact closed Power supply on / DC OK DC OK contact open Power supply off / DC fail Maximum DC OK contact rating 30 VDC, 1 A resistive load Remote-control terminals TB1 pin 4 relative to TB1 pin 2 (−Vin) Output ON Remote input open, or 5.5–10 VDC Output OFF Remote input shorted, or 0–0.8 VDC Front-panel indication DC OK indicator Observe the relay contact rating when connecting an external monitoring circuit. Remote ON/OFF controls the converter output; disconnect the DC input before installing or servicing wiring. Terminal Assignment and Wiring TB1 pin 1 FG / protective earth TB1 pin 2 DC input −Vin TB1 pin 3 DC input +Vin TB1 pin 4 Remote ON/OFF TB2 pins 1, 2 DC output +Vo TB2 pins 3, 4 DC output −Vo TB2 pins 5, 6 DC OK relay contact TB2 pin 7 P+ current sharing TB2 pin 8 P− current sharing Observe the numbered terminals in the mechanical drawing. Connect FG to the installation protective-earth system and size the DC conductors and terminations for this model’s input and output currents. Keep the DC OK contacts separate from the DC power and current-sharing connections. Allow access to the terminals, Vo Adj. control and rail latch after installation. Cooling, Temperature and Input Derating Cooling Free-air convection; fanless Required orientation for the published curves Vertical Working ambient range −40 to +80°C, subject to derating Continuous-load temperature curve 100% through 60°C; reduce along the plotted line to 40% at 80°C Full 150% peak temperature range −40 to +60°C, within the peak-duration limit Load at minimum continuous input 80% Input for 100% load 21.6 VDC and above within the continuous input range Operating altitude Up to 5000 m; overvoltage category II Altitude temperature derating Above 2000 m: reduce permitted ambient temperature by 3.5°C per additional 1000 m Input-voltage and temperature limits apply together. At low input, follow the rising input-derating line between the minimum continuous voltage and the full-load input point; short-duration input operation is not a full-load continuous extension. Above 60°C, reduce the allowed 5-second peak along its separate upper curve to 40% load at 80°C. The model-specific continuous-load curve remains a separate constraint. Provide unobstructed airflow around the installed converter. Do not treat the ambient range, peak capability or altitude statement as an unconditional full-load rating. Environmental and Mechanical Data Working humidity 5–95% RH, non-condensing Storage temperature / humidity −40 to +85°C; 5–95% RH, non-condensing Temperature coefficient ±0.03%/°C over 0–55°C Component vibration 10–500 Hz, 5 G; 10 minutes per cycle; 60 minutes on each X, Y and Z axis Vibration mounting requirement Compliance with IEC 61373 Catalogue body dimensions, W × H × D 85.5 × 125.2 × 129.2 mm Case reference 984F Drawing tolerance ±1 mm DIN rail compatibility TS35/7.5 or TS35/15 Rail supply status Reference rail shown; not included with the unit Unit mass, catalogue PACKING reference 1375 g Catalogue packing 1.375 kg; 8 units / 12 kg / 0.95 CUFT Minimum MTBF 750.3K hours, Telcordia SR-332 (Bellcore); 101.7K hours, MIL-HDBK-217F at 25°C Nominal switching frequency 65 kHz Catalogue warranty 3 years Use the illustrated DIN rail mounting and removal arrangement. The body dimensions do not include the installed rail, external wiring or cable-bend clearance. Select the rail and installation hardware for the enclosure. The listed mass is the explicit per-unit catalogue packing reference; it is not a measured installation mass or the gross mass of an individual shipping box. Safety, Isolation and EMC Catalogue-listed safety approvals IEC 62368-1; UL 62368-1; AS/NZS 62368-1; EAC TP TC 004 Input-to-output isolation 4 kVDC; reinforced isolation Input-to-FG withstand voltage 2.5 kVDC Output-to-FG withstand voltage 0.71 kVDC Isolation resistance >100 MΩ between input–output, input–FG and output–FG at 500 VDC, 25°C and 70% RH Conducted emissions BS EN / EN 55032, Class A Radiated emissions BS EN / EN 55032, Class B Immunity standards BS EN / EN 55035 Railway standards BS EN / EN 50155; IEC 60571; IEC 61373 shock and vibration; BS EN / EN 50121-3-2 EMC; BS EN / EN 45545-2 fire protection The six listed immunity tests use criterion A: ESD level 3 at 8 kV air and 6 kV contact; radiated RF level 3 at 10 V/m; EFT/burst level 3 at 2 kV; surge level 3 at 1 kV line–line and 2 kV line–line–FG; conducted RF level 3 at 10 V; and magnetic field level 4 at 30 A/m. The emissions table names BS EN / EN 61000-3-3 for voltage flicker without a numerical test level; it does not specify a harmonic-current limit. Confirm EMC compliance of the complete equipment after integration. Railway Environmental and Fire Tests The catalogue reports PASS for EN 50155 dry heat (section 13.4.5: 70°C for 6 hours and 85°C for 10 minutes); cyclic damp heat (13.4.8: 25–55°C, 90–100% RH, 48 hours); vibration (13.4.10: 19°C, 65% RH, 10 minutes); shock (13.4.10: 21 ±3°C, 65 ±5% RH, 30 ms ×18); low-temperature storage (13.4.6: −40°C, 16 hours); and salt mist (13.4.13: 35 ±2°C, 96 hours). These test conditions do not expand continuous operating limits. EN 45545-2:2020 results are marked PASS at HL1, HL2 and HL3 for all listed items: PCB R22 oxygen index, smoke density and smoke toxicity; PCB R24 oxygen index; PCB R25 glow-wire; potting R24 oxygen index; and terminal-block R26 vertical flame. Test methods are EN ISO 4589-2:2017, EN ISO 5659-2:2017, EN 17084:2018, EN 60695-2-11:2014 and EN 60695-11-10:2013 as applicable. Component results do not certify the entire vehicle or equipment.

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  MEAN WELL DDR-240 series: DIN Rail DC/DC Converter - DDR-240D-48

  The MEAN WELL DDR-240D-48 is a fanless DIN rail DC/DC converter rated at 48 V, 5 A and 240 W. Its D-code input supports 67.2–154 VDC continuously, with a separate 66–67.2 VDC band for 100 ms. The metal enclosure provides reinforced 4 kVDC input-to-output isolation, adjustable output, a DC OK relay, remote ON/OFF and active current sharing. A 360 W peak is available for up to 3 seconds under the specified temperature and loading conditions. Product Datasheet Download MEAN WELL DDR-240 Datasheet (PDF) The DDR-240 section is on PDF pages 23, 24, 25, 26, 27, 28, 29, 30, 31. Refer to the complete mechanical drawings and notes when planning installation. Model and Output Ratings Full model DDR-240D-48 Series DDR-240 Input code D DC output voltage 48 V Rated output current 5 A Rated output power 240 W Output current range 0–5 A Output voltage adjustment range 48–56 V Peak output current 7.5 A Peak output power 360 W Peak duration 3 seconds maximum Maximum ripple and noise 100 mVp-p Voltage tolerance ±1.0% Line regulation ±0.5% Load regulation ±1.0% Adjust the output with the front-panel Vo Adj. control and retain the current, power and thermal limits. The adjustment range is the specified voltage interval. Suitable applications include railway and industrial control, security, factory automation and telecommunications. The converter can provide DC voltage conversion, additional input/output insulation and compensation for cable voltage drop within its adjustment range. Input and Hold-up Performance Continuous DC input range 67.2–154 VDC 100 ms input range 66–67.2 VDC Reference DC input 110 VDC Typical efficiency 92.5% Typical DC input current 2.5 A at 110 VDC Typical inrush current 30 A Set-up / rise time 500 / 60 ms Minimum hold-up at 100% load 11 ms at 110 VDC Minimum hold-up at 70% load 15 ms at 110 VDC Supply interruption classification EN 50155:2021, S1 Normal measurement conditions 110 VDC input, rated load and 25°C ambient The 100 ms low-input band is a short-duration condition and does not extend the continuous input range. Apply the separate input-voltage derating curve before selecting the load. Use the dedicated model hold-up-versus-load curve for other load levels. A larger hold-up duration at reduced load is not a full-load rating. Ripple and noise are measured at 20 MHz bandwidth using a 12-inch twisted pair terminated by parallel 0.1 µF and 47 µF capacitors. Voltage tolerance includes set-up tolerance, line regulation and load regulation. Peak Loading and Protection Peak loading capability 150% of the model rated output power for the stated peak duration Protection functions Short circuit, overload, overvoltage, overtemperature, input reverse polarity and input undervoltage Sustained overload response Constant-current limiting at 105–135% of rated output power; automatic recovery after the overload is removed Overvoltage threshold 57.6–65 V Overvoltage recovery Output shutdown; reapply input power to recover Overtemperature recovery Output shutdown; reapply input power to recover Input undervoltage turn-on specification ≥67.2 VDC Input undervoltage turn-off specification ≤65 VDC Input undervoltage recovery Automatic when the input rises above the operating threshold Internal input fuse reference 1 × Conquer MST, 6.3 A, 250 V; time-lag The catalogue shows two loading examples: 240 W for 100 seconds followed by 360 W for 3 seconds; or 120 W for 10 seconds followed by 360 W for 3 seconds. These are conditional pulse-load patterns; peak power is not a continuous rating. Apply the peak-temperature curve as well as the continuous-load limits. After the initial peak interval, a sustained overload enters the specified constant-current protection region. Keep planned peaks within 3 seconds; the overload-protection response does not authorize a longer peak interval. A MOSFET in series with the negative input prevents output when input polarity is reversed. Correct the polarity before restoring operation. A start-up resistor limits inrush current and is then bypassed by a MOSFET. The fuse references identify internal protection components; they are not an external fuse-selection instruction. Current Sharing Maximum parallel units 4 Output-voltage matching Difference strictly less than 0.2 V Total output-current limit Rated current per unit × number of units × 0.9 Minimum parallel load Strictly greater than 3% × rated current per unit × number of units Four-unit current limit at the stated unit ratings 18 A Current-sharing connections Connect P+ to P+ and P− to P− across all participating units The series specification describes current sharing up to 960 W (3+1 units). Size the usable load with the 0.9 current formula, the actual model rating and all applicable derating conditions. The headline aggregate rating is not an unconditional usable load or N+1 capacity guarantee. Use matching output-voltage units, connect the outputs and sharing terminals as illustrated, and adjust their output-voltage differences to less than 0.2 V. Consult the manufacturer for arrangements beyond four units. DC OK Relay and Remote ON/OFF DC OK contact closed Power supply on / DC OK DC OK contact open Power supply off / DC fail Maximum DC OK contact rating 30 VDC, 1 A resistive load Remote-control terminals TB1 pin 4 relative to TB1 pin 2 (−Vin) Output ON Remote input open, or 4–10 VDC Output OFF Remote input shorted, or 0–0.8 VDC Front-panel indication DC OK indicator Observe the relay contact rating when connecting an external monitoring circuit. Remote ON/OFF controls the converter output; disconnect the DC input before installing or servicing wiring. Terminal Assignment and Wiring TB1 pin 1 FG / protective earth TB1 pin 2 DC input −Vin TB1 pin 3 DC input +Vin TB1 pin 4 Remote ON/OFF TB2 pins 1, 2 DC output +Vo TB2 pins 3, 4 DC OK relay contact TB3 pins 5, 6 DC output −Vo TB3 pin 7 P+ current sharing TB3 pin 8 P− current sharing Observe the numbered terminals in the mechanical drawing. Connect FG to the installation protective-earth system and size the DC conductors and terminations for this model’s input and output currents. Keep the DC OK contacts separate from the DC power and current-sharing connections. Allow access to the terminals, Vo Adj. control and rail latch after installation. Cooling, Temperature and Input Derating Cooling Free-air convection; fanless Required orientation for the published curves Vertical Working ambient range −40 to +70°C, subject to derating Continuous-load temperature curve 100% through 50°C; reduce along the plotted line to 40% at 70°C Full 150% peak temperature range −40 to +50°C, within the peak-duration limit Load at minimum continuous input 90% Input for 100% load 86.4 VDC and above within the continuous input range Operating altitude Up to 5000 m Altitude temperature derating Above 2000 m: reduce permitted ambient temperature by 3.5°C per additional 1000 m Input-voltage and temperature limits apply together. At low input, follow the rising input-derating line between the minimum continuous voltage and the full-load input point; short-duration input operation is not a full-load continuous extension. Above 50°C, reduce the allowed 3-second peak according to the separate upper curve; the plotted 60°C peak point is 120% load. Continuous output is separately limited by the lower curve. Provide unobstructed airflow around the installed converter. Do not treat the ambient range, peak capability or altitude statement as an unconditional full-load rating. Environmental and Mechanical Data Working humidity 5–95% RH, non-condensing Storage temperature / humidity −40 to +85°C; 5–95% RH, non-condensing Temperature coefficient ±0.03%/°C over 0–55°C Component vibration 10–500 Hz, 5 G; 10 minutes per cycle; 60 minutes on each X, Y and Z axis Vibration mounting requirement Compliance with IEC 61373 Catalogue body dimensions, W × H × D 40 × 125.2 × 113.5 mm Case reference 265A-D Drawing tolerance ±1 mm DIN rail compatibility TS35/7.5 or TS35/15 Rail supply status Reference rail shown; not included with the unit Unit mass, catalogue PACKING reference 760 g Catalogue packing 0.76 kg; 20 units / 16.2 kg / 1.0 CUFT Minimum MTBF 1415.6K hours, Telcordia SR-332 (Bellcore); 189.9K hours, MIL-HDBK-217F at 25°C Nominal switching frequency 80 kHz Catalogue warranty 3 years Use the illustrated DIN rail mounting and removal arrangement. The body dimensions do not include the installed rail, external wiring or cable-bend clearance. Select the rail and installation hardware for the enclosure. The listed mass is the explicit per-unit catalogue packing reference; it is not a measured installation mass or the gross mass of an individual shipping box. Safety, Isolation and EMC Catalogue-listed safety approvals IEC 62368-1; UL 62368-1; AS/NZS 62368-1; EAC TP TC 004 Input-to-output isolation 4 kVDC; reinforced isolation Input-to-FG withstand voltage 2.5 kVDC Output-to-FG withstand voltage 0.71 kVDC Isolation resistance >100 MΩ between input–output, input–FG and output–FG at 500 VDC, 25°C and 70% RH Conducted emissions BS EN / EN 55032, Class B Radiated emissions BS EN / EN 55032, Class B Immunity standards BS EN / EN 55035; BS EN / EN 61000-6-2 (EN 50082-2) Railway standards BS EN / EN 50155; IEC 60571; IEC 61373 shock and vibration; BS EN / EN 50121-3-2 EMC; BS EN / EN 45545-2 fire protection The six listed immunity tests use criterion A: ESD level 3 at 8 kV air and 6 kV contact; radiated RF level 3 at 10 V/m; EFT/burst level 3 at 2 kV; surge level 3 at 1 kV line–line and 2 kV line–line–FG; conducted RF level 3 at 10 V; and magnetic field level 4 at 30 A/m. The emissions table names BS EN / EN 61000-3-3 for voltage flicker without a numerical test level; it does not specify a harmonic-current limit. Confirm EMC compliance of the complete equipment after integration. Railway Environmental and Fire Tests The catalogue reports PASS for EN 50155 dry heat (section 13.4.5: 70°C for 6 hours and 85°C for 10 minutes); cyclic damp heat (13.4.8: 25–55°C, 90–100% RH, 48 hours); vibration (13.4.10: 19°C, 65% RH, 10 minutes); shock (13.4.10: 21 ±3°C, 65 ±5% RH, 30 ms ×18); low-temperature storage (13.4.6: −40°C, 16 hours); and salt mist (13.4.13: 35 ±2°C, 96 hours). These test conditions do not expand continuous operating limits. EN 45545-2:2020 results are marked PASS at HL1, HL2 and HL3 for all listed items: PCB R22 oxygen index, smoke density and smoke toxicity; PCB R24 oxygen index; PCB R25 glow-wire; potting R24 oxygen index; and terminal-block R26 vertical flame. Test methods are EN ISO 4589-2:2017, EN ISO 5659-2:2017, EN 17084:2018, EN 60695-2-11:2014 and EN 60695-11-10:2013 as applicable. Component results do not certify the entire vehicle or equipment.

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  MEAN WELL DDR-240 series: DIN Rail DC/DC Converter - DDR-240D-24

  The MEAN WELL DDR-240D-24 is a fanless DIN rail DC/DC converter rated at 24 V, 10 A and 240 W. Its D-code input supports 67.2–154 VDC continuously, with a separate 66–67.2 VDC band for 100 ms. The metal enclosure provides reinforced 4 kVDC input-to-output isolation, adjustable output, a DC OK relay, remote ON/OFF and active current sharing. A 360 W peak is available for up to 3 seconds under the specified temperature and loading conditions. Product Datasheet Download MEAN WELL DDR-240 Datasheet (PDF) The DDR-240 section is on PDF pages 23, 24, 25, 26, 27, 28, 29, 30, 31. Refer to the complete mechanical drawings and notes when planning installation. Model and Output Ratings Full model DDR-240D-24 Series DDR-240 Input code D DC output voltage 24 V Rated output current 10 A Rated output power 240 W Output current range 0–10 A Output voltage adjustment range 24–28 V Peak output current 15 A Peak output power 360 W Peak duration 3 seconds maximum Maximum ripple and noise 80 mVp-p Voltage tolerance ±1.0% Line regulation ±0.5% Load regulation ±1.0% Adjust the output with the front-panel Vo Adj. control and retain the current, power and thermal limits. The adjustment range is the specified voltage interval. Suitable applications include railway and industrial control, security, factory automation and telecommunications. The converter can provide DC voltage conversion, additional input/output insulation and compensation for cable voltage drop within its adjustment range. Input and Hold-up Performance Continuous DC input range 67.2–154 VDC 100 ms input range 66–67.2 VDC Reference DC input 110 VDC Typical efficiency 92% Typical DC input current 2.5 A at 110 VDC Typical inrush current 30 A Set-up / rise time 500 / 60 ms Minimum hold-up at 100% load 11 ms at 110 VDC Minimum hold-up at 70% load 15 ms at 110 VDC Supply interruption classification EN 50155:2021, S1 Normal measurement conditions 110 VDC input, rated load and 25°C ambient The 100 ms low-input band is a short-duration condition and does not extend the continuous input range. Apply the separate input-voltage derating curve before selecting the load. Use the dedicated model hold-up-versus-load curve for other load levels. A larger hold-up duration at reduced load is not a full-load rating. Ripple and noise are measured at 20 MHz bandwidth using a 12-inch twisted pair terminated by parallel 0.1 µF and 47 µF capacitors. Voltage tolerance includes set-up tolerance, line regulation and load regulation. Peak Loading and Protection Peak loading capability 150% of the model rated output power for the stated peak duration Protection functions Short circuit, overload, overvoltage, overtemperature, input reverse polarity and input undervoltage Sustained overload response Constant-current limiting at 105–135% of rated output power; automatic recovery after the overload is removed Overvoltage threshold 28.8–35 V Overvoltage recovery Output shutdown; reapply input power to recover Overtemperature recovery Output shutdown; reapply input power to recover Input undervoltage turn-on specification ≥67.2 VDC Input undervoltage turn-off specification ≤65 VDC Input undervoltage recovery Automatic when the input rises above the operating threshold Internal input fuse reference 1 × Conquer MST, 6.3 A, 250 V; time-lag The catalogue shows two loading examples: 240 W for 100 seconds followed by 360 W for 3 seconds; or 120 W for 10 seconds followed by 360 W for 3 seconds. These are conditional pulse-load patterns; peak power is not a continuous rating. Apply the peak-temperature curve as well as the continuous-load limits. After the initial peak interval, a sustained overload enters the specified constant-current protection region. Keep planned peaks within 3 seconds; the overload-protection response does not authorize a longer peak interval. A MOSFET in series with the negative input prevents output when input polarity is reversed. Correct the polarity before restoring operation. A start-up resistor limits inrush current and is then bypassed by a MOSFET. The fuse references identify internal protection components; they are not an external fuse-selection instruction. Current Sharing Maximum parallel units 4 Output-voltage matching Difference strictly less than 0.2 V Total output-current limit Rated current per unit × number of units × 0.9 Minimum parallel load Strictly greater than 3% × rated current per unit × number of units Four-unit current limit at the stated unit ratings 36 A Current-sharing connections Connect P+ to P+ and P− to P− across all participating units The series specification describes current sharing up to 960 W (3+1 units). Size the usable load with the 0.9 current formula, the actual model rating and all applicable derating conditions. The headline aggregate rating is not an unconditional usable load or N+1 capacity guarantee. Use matching output-voltage units, connect the outputs and sharing terminals as illustrated, and adjust their output-voltage differences to less than 0.2 V. Consult the manufacturer for arrangements beyond four units. DC OK Relay and Remote ON/OFF DC OK contact closed Power supply on / DC OK DC OK contact open Power supply off / DC fail Maximum DC OK contact rating 30 VDC, 1 A resistive load Remote-control terminals TB1 pin 4 relative to TB1 pin 2 (−Vin) Output ON Remote input open, or 4–10 VDC Output OFF Remote input shorted, or 0–0.8 VDC Front-panel indication DC OK indicator Observe the relay contact rating when connecting an external monitoring circuit. Remote ON/OFF controls the converter output; disconnect the DC input before installing or servicing wiring. Terminal Assignment and Wiring TB1 pin 1 FG / protective earth TB1 pin 2 DC input −Vin TB1 pin 3 DC input +Vin TB1 pin 4 Remote ON/OFF TB2 pins 1, 2 DC output +Vo TB2 pins 3, 4 DC OK relay contact TB3 pins 5, 6 DC output −Vo TB3 pin 7 P+ current sharing TB3 pin 8 P− current sharing Observe the numbered terminals in the mechanical drawing. Connect FG to the installation protective-earth system and size the DC conductors and terminations for this model’s input and output currents. Keep the DC OK contacts separate from the DC power and current-sharing connections. Allow access to the terminals, Vo Adj. control and rail latch after installation. Cooling, Temperature and Input Derating Cooling Free-air convection; fanless Required orientation for the published curves Vertical Working ambient range −40 to +70°C, subject to derating Continuous-load temperature curve 100% through 50°C; reduce along the plotted line to 40% at 70°C Full 150% peak temperature range −40 to +50°C, within the peak-duration limit Load at minimum continuous input 90% Input for 100% load 86.4 VDC and above within the continuous input range Operating altitude Up to 5000 m Altitude temperature derating Above 2000 m: reduce permitted ambient temperature by 3.5°C per additional 1000 m Input-voltage and temperature limits apply together. At low input, follow the rising input-derating line between the minimum continuous voltage and the full-load input point; short-duration input operation is not a full-load continuous extension. Above 50°C, reduce the allowed 3-second peak according to the separate upper curve; the plotted 60°C peak point is 120% load. Continuous output is separately limited by the lower curve. Provide unobstructed airflow around the installed converter. Do not treat the ambient range, peak capability or altitude statement as an unconditional full-load rating. Environmental and Mechanical Data Working humidity 5–95% RH, non-condensing Storage temperature / humidity −40 to +85°C; 5–95% RH, non-condensing Temperature coefficient ±0.03%/°C over 0–55°C Component vibration 10–500 Hz, 5 G; 10 minutes per cycle; 60 minutes on each X, Y and Z axis Vibration mounting requirement Compliance with IEC 61373 Catalogue body dimensions, W × H × D 40 × 125.2 × 113.5 mm Case reference 265A-D Drawing tolerance ±1 mm DIN rail compatibility TS35/7.5 or TS35/15 Rail supply status Reference rail shown; not included with the unit Unit mass, catalogue PACKING reference 760 g Catalogue packing 0.76 kg; 20 units / 16.2 kg / 1.0 CUFT Minimum MTBF 1415.6K hours, Telcordia SR-332 (Bellcore); 189.9K hours, MIL-HDBK-217F at 25°C Nominal switching frequency 80 kHz Catalogue warranty 3 years Use the illustrated DIN rail mounting and removal arrangement. The body dimensions do not include the installed rail, external wiring or cable-bend clearance. Select the rail and installation hardware for the enclosure. The listed mass is the explicit per-unit catalogue packing reference; it is not a measured installation mass or the gross mass of an individual shipping box. Safety, Isolation and EMC Catalogue-listed safety approvals IEC 62368-1; UL 62368-1; AS/NZS 62368-1; EAC TP TC 004 Input-to-output isolation 4 kVDC; reinforced isolation Input-to-FG withstand voltage 2.5 kVDC Output-to-FG withstand voltage 0.71 kVDC Isolation resistance >100 MΩ between input–output, input–FG and output–FG at 500 VDC, 25°C and 70% RH Conducted emissions BS EN / EN 55032, Class B Radiated emissions BS EN / EN 55032, Class B Immunity standards BS EN / EN 55035; BS EN / EN 61000-6-2 (EN 50082-2) Railway standards BS EN / EN 50155; IEC 60571; IEC 61373 shock and vibration; BS EN / EN 50121-3-2 EMC; BS EN / EN 45545-2 fire protection The six listed immunity tests use criterion A: ESD level 3 at 8 kV air and 6 kV contact; radiated RF level 3 at 10 V/m; EFT/burst level 3 at 2 kV; surge level 3 at 1 kV line–line and 2 kV line–line–FG; conducted RF level 3 at 10 V; and magnetic field level 4 at 30 A/m. The emissions table names BS EN / EN 61000-3-3 for voltage flicker without a numerical test level; it does not specify a harmonic-current limit. Confirm EMC compliance of the complete equipment after integration. Railway Environmental and Fire Tests The catalogue reports PASS for EN 50155 dry heat (section 13.4.5: 70°C for 6 hours and 85°C for 10 minutes); cyclic damp heat (13.4.8: 25–55°C, 90–100% RH, 48 hours); vibration (13.4.10: 19°C, 65% RH, 10 minutes); shock (13.4.10: 21 ±3°C, 65 ±5% RH, 30 ms ×18); low-temperature storage (13.4.6: −40°C, 16 hours); and salt mist (13.4.13: 35 ±2°C, 96 hours). These test conditions do not expand continuous operating limits. EN 45545-2:2020 results are marked PASS at HL1, HL2 and HL3 for all listed items: PCB R22 oxygen index, smoke density and smoke toxicity; PCB R24 oxygen index; PCB R25 glow-wire; potting R24 oxygen index; and terminal-block R26 vertical flame. Test methods are EN ISO 4589-2:2017, EN ISO 5659-2:2017, EN 17084:2018, EN 60695-2-11:2014 and EN 60695-11-10:2013 as applicable. Component results do not certify the entire vehicle or equipment.

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  MEAN WELL DDR-240 series: DIN Rail DC/DC Converter - DDR-240C-48

  The MEAN WELL DDR-240C-48 is a fanless DIN rail DC/DC converter rated at 48 V, 5 A and 240 W. Its C-code input supports 33.6–67.2 VDC continuously, with a separate 28.8–33.6 VDC band for 100 ms. The metal enclosure provides reinforced 4 kVDC input-to-output isolation, adjustable output, a DC OK relay, remote ON/OFF and active current sharing. A 360 W peak is available for up to 3 seconds under the specified temperature and loading conditions. Product Datasheet Download MEAN WELL DDR-240 Datasheet (PDF) The DDR-240 section is on PDF pages 23, 24, 25, 26, 27, 28, 29, 30, 31. Refer to the complete mechanical drawings and notes when planning installation. Model and Output Ratings Full model DDR-240C-48 Series DDR-240 Input code C DC output voltage 48 V Rated output current 5 A Rated output power 240 W Output current range 0–5 A Output voltage adjustment range 48–56 V Peak output current 7.5 A Peak output power 360 W Peak duration 3 seconds maximum Maximum ripple and noise 100 mVp-p Voltage tolerance ±1.0% Line regulation ±0.5% Load regulation ±1.0% Adjust the output with the front-panel Vo Adj. control and retain the current, power and thermal limits. The adjustment range is the specified voltage interval. Suitable applications include railway and industrial control, security, factory automation and telecommunications. The converter can provide DC voltage conversion, additional input/output insulation and compensation for cable voltage drop within its adjustment range. Input and Hold-up Performance Continuous DC input range 33.6–67.2 VDC 100 ms input range 28.8–33.6 VDC Reference DC input 48 VDC Typical efficiency 92% Typical DC input current 5.6 A at 48 VDC Typical inrush current 30 A Set-up / rise time 500 / 60 ms Minimum hold-up at 100% load 8 ms at 48 VDC Minimum hold-up at 70% load 11 ms at 48 VDC Supply interruption classification EN 50155:2021, S1 Normal measurement conditions 48 VDC input, rated load and 25°C ambient The 100 ms low-input band is a short-duration condition and does not extend the continuous input range. Apply the separate input-voltage derating curve before selecting the load. Use the dedicated model hold-up-versus-load curve for other load levels. A larger hold-up duration at reduced load is not a full-load rating. Ripple and noise are measured at 20 MHz bandwidth using a 12-inch twisted pair terminated by parallel 0.1 µF and 47 µF capacitors. Voltage tolerance includes set-up tolerance, line regulation and load regulation. Peak Loading and Protection Peak loading capability 150% of the model rated output power for the stated peak duration Protection functions Short circuit, overload, overvoltage, overtemperature, input reverse polarity and input undervoltage Sustained overload response Constant-current limiting at 105–135% of rated output power; automatic recovery after the overload is removed Overvoltage threshold 57.6–65 V Overvoltage recovery Output shutdown; reapply input power to recover Overtemperature recovery Output shutdown; reapply input power to recover Input undervoltage turn-on specification ≥33.6 VDC Input undervoltage turn-off specification ≤33 VDC Input undervoltage recovery Automatic when the input rises above the operating threshold Internal input fuse reference 2 × Conquer MST, 6.3 A, 250 V; time-lag The catalogue shows two loading examples: 240 W for 100 seconds followed by 360 W for 3 seconds; or 120 W for 10 seconds followed by 360 W for 3 seconds. These are conditional pulse-load patterns; peak power is not a continuous rating. Apply the peak-temperature curve as well as the continuous-load limits. After the initial peak interval, a sustained overload enters the specified constant-current protection region. Keep planned peaks within 3 seconds; the overload-protection response does not authorize a longer peak interval. A MOSFET in series with the negative input prevents output when input polarity is reversed. Correct the polarity before restoring operation. A start-up resistor limits inrush current and is then bypassed by a MOSFET. The fuse references identify internal protection components; they are not an external fuse-selection instruction. Current Sharing Maximum parallel units 4 Output-voltage matching Difference strictly less than 0.2 V Total output-current limit Rated current per unit × number of units × 0.9 Minimum parallel load Strictly greater than 3% × rated current per unit × number of units Four-unit current limit at the stated unit ratings 18 A Current-sharing connections Connect P+ to P+ and P− to P− across all participating units The series specification describes current sharing up to 960 W (3+1 units). Size the usable load with the 0.9 current formula, the actual model rating and all applicable derating conditions. The headline aggregate rating is not an unconditional usable load or N+1 capacity guarantee. Use matching output-voltage units, connect the outputs and sharing terminals as illustrated, and adjust their output-voltage differences to less than 0.2 V. Consult the manufacturer for arrangements beyond four units. DC OK Relay and Remote ON/OFF DC OK contact closed Power supply on / DC OK DC OK contact open Power supply off / DC fail Maximum DC OK contact rating 30 VDC, 1 A resistive load Remote-control terminals TB1 pin 4 relative to TB1 pin 2 (−Vin) Output ON Remote input open, or 4–10 VDC Output OFF Remote input shorted, or 0–0.8 VDC Front-panel indication DC OK indicator Observe the relay contact rating when connecting an external monitoring circuit. Remote ON/OFF controls the converter output; disconnect the DC input before installing or servicing wiring. Terminal Assignment and Wiring TB1 pin 1 FG / protective earth TB1 pin 2 DC input −Vin TB1 pin 3 DC input +Vin TB1 pin 4 Remote ON/OFF TB2 pins 1, 2 DC output +Vo TB2 pins 3, 4 DC OK relay contact TB3 pins 5, 6 DC output −Vo TB3 pin 7 P+ current sharing TB3 pin 8 P− current sharing Observe the numbered terminals in the mechanical drawing. Connect FG to the installation protective-earth system and size the DC conductors and terminations for this model’s input and output currents. Keep the DC OK contacts separate from the DC power and current-sharing connections. Allow access to the terminals, Vo Adj. control and rail latch after installation. Cooling, Temperature and Input Derating Cooling Free-air convection; fanless Required orientation for the published curves Vertical Working ambient range −40 to +70°C, subject to derating Continuous-load temperature curve 100% through 50°C; reduce along the plotted line to 40% at 70°C Full 150% peak temperature range −40 to +50°C, within the peak-duration limit Load at minimum continuous input 90% Input for 100% load 43.2 VDC and above within the continuous input range Operating altitude Up to 5000 m Altitude temperature derating Above 2000 m: reduce permitted ambient temperature by 3.5°C per additional 1000 m Input-voltage and temperature limits apply together. At low input, follow the rising input-derating line between the minimum continuous voltage and the full-load input point; short-duration input operation is not a full-load continuous extension. Above 50°C, reduce the allowed 3-second peak according to the separate upper curve; the plotted 60°C peak point is 120% load. Continuous output is separately limited by the lower curve. Provide unobstructed airflow around the installed converter. Do not treat the ambient range, peak capability or altitude statement as an unconditional full-load rating. Environmental and Mechanical Data Working humidity 5–95% RH, non-condensing Storage temperature / humidity −40 to +85°C; 5–95% RH, non-condensing Temperature coefficient ±0.03%/°C over 0–55°C Component vibration 10–500 Hz, 5 G; 10 minutes per cycle; 60 minutes on each X, Y and Z axis Vibration mounting requirement Compliance with IEC 61373 Catalogue body dimensions, W × H × D 40 × 125.2 × 113.5 mm Case reference 265A-D Drawing tolerance ±1 mm DIN rail compatibility TS35/7.5 or TS35/15 Rail supply status Reference rail shown; not included with the unit Unit mass, catalogue PACKING reference 760 g Catalogue packing 0.76 kg; 20 units / 16.2 kg / 1.0 CUFT Minimum MTBF 1415.6K hours, Telcordia SR-332 (Bellcore); 189.9K hours, MIL-HDBK-217F at 25°C Nominal switching frequency 80 kHz Catalogue warranty 3 years Use the illustrated DIN rail mounting and removal arrangement. The body dimensions do not include the installed rail, external wiring or cable-bend clearance. Select the rail and installation hardware for the enclosure. The listed mass is the explicit per-unit catalogue packing reference; it is not a measured installation mass or the gross mass of an individual shipping box. Safety, Isolation and EMC Catalogue-listed safety approvals IEC 62368-1; UL 62368-1; AS/NZS 62368-1; EAC TP TC 004 Input-to-output isolation 4 kVDC; reinforced isolation Input-to-FG withstand voltage 2.5 kVDC Output-to-FG withstand voltage 0.71 kVDC Isolation resistance >100 MΩ between input–output, input–FG and output–FG at 500 VDC, 25°C and 70% RH Conducted emissions BS EN / EN 55032, Class B Radiated emissions BS EN / EN 55032, Class B Immunity standards BS EN / EN 55035; BS EN / EN 61000-6-2 (EN 50082-2) Railway standards BS EN / EN 50155; IEC 60571; IEC 61373 shock and vibration; BS EN / EN 50121-3-2 EMC; BS EN / EN 45545-2 fire protection The six listed immunity tests use criterion A: ESD level 3 at 8 kV air and 6 kV contact; radiated RF level 3 at 10 V/m; EFT/burst level 3 at 2 kV; surge level 3 at 1 kV line–line and 2 kV line–line–FG; conducted RF level 3 at 10 V; and magnetic field level 4 at 30 A/m. The emissions table names BS EN / EN 61000-3-3 for voltage flicker without a numerical test level; it does not specify a harmonic-current limit. Confirm EMC compliance of the complete equipment after integration. Railway Environmental and Fire Tests The catalogue reports PASS for EN 50155 dry heat (section 13.4.5: 70°C for 6 hours and 85°C for 10 minutes); cyclic damp heat (13.4.8: 25–55°C, 90–100% RH, 48 hours); vibration (13.4.10: 19°C, 65% RH, 10 minutes); shock (13.4.10: 21 ±3°C, 65 ±5% RH, 30 ms ×18); low-temperature storage (13.4.6: −40°C, 16 hours); and salt mist (13.4.13: 35 ±2°C, 96 hours). These test conditions do not expand continuous operating limits. EN 45545-2:2020 results are marked PASS at HL1, HL2 and HL3 for all listed items: PCB R22 oxygen index, smoke density and smoke toxicity; PCB R24 oxygen index; PCB R25 glow-wire; potting R24 oxygen index; and terminal-block R26 vertical flame. Test methods are EN ISO 4589-2:2017, EN ISO 5659-2:2017, EN 17084:2018, EN 60695-2-11:2014 and EN 60695-11-10:2013 as applicable. Component results do not certify the entire vehicle or equipment.

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  MEAN WELL DDR-240 series: DIN Rail DC/DC Converter - DDR-240C-24

  The MEAN WELL DDR-240C-24 is a fanless DIN rail DC/DC converter rated at 24 V, 10 A and 240 W. Its C-code input supports 33.6–67.2 VDC continuously, with a separate 28.8–33.6 VDC band for 100 ms. The metal enclosure provides reinforced 4 kVDC input-to-output isolation, adjustable output, a DC OK relay, remote ON/OFF and active current sharing. A 360 W peak is available for up to 3 seconds under the specified temperature and loading conditions. Product Datasheet Download MEAN WELL DDR-240 Datasheet (PDF) The DDR-240 section is on PDF pages 23, 24, 25, 26, 27, 28, 29, 30, 31. Refer to the complete mechanical drawings and notes when planning installation. Model and Output Ratings Full model DDR-240C-24 Series DDR-240 Input code C DC output voltage 24 V Rated output current 10 A Rated output power 240 W Output current range 0–10 A Output voltage adjustment range 24–28 V Peak output current 15 A Peak output power 360 W Peak duration 3 seconds maximum Maximum ripple and noise 80 mVp-p Voltage tolerance ±1.0% Line regulation ±0.5% Load regulation ±1.0% Adjust the output with the front-panel Vo Adj. control and retain the current, power and thermal limits. The adjustment range is the specified voltage interval. Suitable applications include railway and industrial control, security, factory automation and telecommunications. The converter can provide DC voltage conversion, additional input/output insulation and compensation for cable voltage drop within its adjustment range. Input and Hold-up Performance Continuous DC input range 33.6–67.2 VDC 100 ms input range 28.8–33.6 VDC Reference DC input 48 VDC Typical efficiency 91% Typical DC input current 5.6 A at 48 VDC Typical inrush current 30 A Set-up / rise time 500 / 60 ms Minimum hold-up at 100% load 8 ms at 48 VDC Minimum hold-up at 70% load 11 ms at 48 VDC Supply interruption classification EN 50155:2021, S1 Normal measurement conditions 48 VDC input, rated load and 25°C ambient The 100 ms low-input band is a short-duration condition and does not extend the continuous input range. Apply the separate input-voltage derating curve before selecting the load. Use the dedicated model hold-up-versus-load curve for other load levels. A larger hold-up duration at reduced load is not a full-load rating. Ripple and noise are measured at 20 MHz bandwidth using a 12-inch twisted pair terminated by parallel 0.1 µF and 47 µF capacitors. Voltage tolerance includes set-up tolerance, line regulation and load regulation. Peak Loading and Protection Peak loading capability 150% of the model rated output power for the stated peak duration Protection functions Short circuit, overload, overvoltage, overtemperature, input reverse polarity and input undervoltage Sustained overload response Constant-current limiting at 105–135% of rated output power; automatic recovery after the overload is removed Overvoltage threshold 28.8–35 V Overvoltage recovery Output shutdown; reapply input power to recover Overtemperature recovery Output shutdown; reapply input power to recover Input undervoltage turn-on specification ≥33.6 VDC Input undervoltage turn-off specification ≤33 VDC Input undervoltage recovery Automatic when the input rises above the operating threshold Internal input fuse reference 2 × Conquer MST, 6.3 A, 250 V; time-lag The catalogue shows two loading examples: 240 W for 100 seconds followed by 360 W for 3 seconds; or 120 W for 10 seconds followed by 360 W for 3 seconds. These are conditional pulse-load patterns; peak power is not a continuous rating. Apply the peak-temperature curve as well as the continuous-load limits. After the initial peak interval, a sustained overload enters the specified constant-current protection region. Keep planned peaks within 3 seconds; the overload-protection response does not authorize a longer peak interval. A MOSFET in series with the negative input prevents output when input polarity is reversed. Correct the polarity before restoring operation. A start-up resistor limits inrush current and is then bypassed by a MOSFET. The fuse references identify internal protection components; they are not an external fuse-selection instruction. Current Sharing Maximum parallel units 4 Output-voltage matching Difference strictly less than 0.2 V Total output-current limit Rated current per unit × number of units × 0.9 Minimum parallel load Strictly greater than 3% × rated current per unit × number of units Four-unit current limit at the stated unit ratings 36 A Current-sharing connections Connect P+ to P+ and P− to P− across all participating units The series specification describes current sharing up to 960 W (3+1 units). Size the usable load with the 0.9 current formula, the actual model rating and all applicable derating conditions. The headline aggregate rating is not an unconditional usable load or N+1 capacity guarantee. Use matching output-voltage units, connect the outputs and sharing terminals as illustrated, and adjust their output-voltage differences to less than 0.2 V. Consult the manufacturer for arrangements beyond four units. DC OK Relay and Remote ON/OFF DC OK contact closed Power supply on / DC OK DC OK contact open Power supply off / DC fail Maximum DC OK contact rating 30 VDC, 1 A resistive load Remote-control terminals TB1 pin 4 relative to TB1 pin 2 (−Vin) Output ON Remote input open, or 4–10 VDC Output OFF Remote input shorted, or 0–0.8 VDC Front-panel indication DC OK indicator Observe the relay contact rating when connecting an external monitoring circuit. Remote ON/OFF controls the converter output; disconnect the DC input before installing or servicing wiring. Terminal Assignment and Wiring TB1 pin 1 FG / protective earth TB1 pin 2 DC input −Vin TB1 pin 3 DC input +Vin TB1 pin 4 Remote ON/OFF TB2 pins 1, 2 DC output +Vo TB2 pins 3, 4 DC OK relay contact TB3 pins 5, 6 DC output −Vo TB3 pin 7 P+ current sharing TB3 pin 8 P− current sharing Observe the numbered terminals in the mechanical drawing. Connect FG to the installation protective-earth system and size the DC conductors and terminations for this model’s input and output currents. Keep the DC OK contacts separate from the DC power and current-sharing connections. Allow access to the terminals, Vo Adj. control and rail latch after installation. Cooling, Temperature and Input Derating Cooling Free-air convection; fanless Required orientation for the published curves Vertical Working ambient range −40 to +70°C, subject to derating Continuous-load temperature curve 100% through 50°C; reduce along the plotted line to 40% at 70°C Full 150% peak temperature range −40 to +50°C, within the peak-duration limit Load at minimum continuous input 90% Input for 100% load 43.2 VDC and above within the continuous input range Operating altitude Up to 5000 m Altitude temperature derating Above 2000 m: reduce permitted ambient temperature by 3.5°C per additional 1000 m Input-voltage and temperature limits apply together. At low input, follow the rising input-derating line between the minimum continuous voltage and the full-load input point; short-duration input operation is not a full-load continuous extension. Above 50°C, reduce the allowed 3-second peak according to the separate upper curve; the plotted 60°C peak point is 120% load. Continuous output is separately limited by the lower curve. Provide unobstructed airflow around the installed converter. Do not treat the ambient range, peak capability or altitude statement as an unconditional full-load rating. Environmental and Mechanical Data Working humidity 5–95% RH, non-condensing Storage temperature / humidity −40 to +85°C; 5–95% RH, non-condensing Temperature coefficient ±0.03%/°C over 0–55°C Component vibration 10–500 Hz, 5 G; 10 minutes per cycle; 60 minutes on each X, Y and Z axis Vibration mounting requirement Compliance with IEC 61373 Catalogue body dimensions, W × H × D 40 × 125.2 × 113.5 mm Case reference 265A-D Drawing tolerance ±1 mm DIN rail compatibility TS35/7.5 or TS35/15 Rail supply status Reference rail shown; not included with the unit Unit mass, catalogue PACKING reference 760 g Catalogue packing 0.76 kg; 20 units / 16.2 kg / 1.0 CUFT Minimum MTBF 1415.6K hours, Telcordia SR-332 (Bellcore); 189.9K hours, MIL-HDBK-217F at 25°C Nominal switching frequency 80 kHz Catalogue warranty 3 years Use the illustrated DIN rail mounting and removal arrangement. The body dimensions do not include the installed rail, external wiring or cable-bend clearance. Select the rail and installation hardware for the enclosure. The listed mass is the explicit per-unit catalogue packing reference; it is not a measured installation mass or the gross mass of an individual shipping box. Safety, Isolation and EMC Catalogue-listed safety approvals IEC 62368-1; UL 62368-1; AS/NZS 62368-1; EAC TP TC 004 Input-to-output isolation 4 kVDC; reinforced isolation Input-to-FG withstand voltage 2.5 kVDC Output-to-FG withstand voltage 0.71 kVDC Isolation resistance >100 MΩ between input–output, input–FG and output–FG at 500 VDC, 25°C and 70% RH Conducted emissions BS EN / EN 55032, Class B Radiated emissions BS EN / EN 55032, Class B Immunity standards BS EN / EN 55035; BS EN / EN 61000-6-2 (EN 50082-2) Railway standards BS EN / EN 50155; IEC 60571; IEC 61373 shock and vibration; BS EN / EN 50121-3-2 EMC; BS EN / EN 45545-2 fire protection The six listed immunity tests use criterion A: ESD level 3 at 8 kV air and 6 kV contact; radiated RF level 3 at 10 V/m; EFT/burst level 3 at 2 kV; surge level 3 at 1 kV line–line and 2 kV line–line–FG; conducted RF level 3 at 10 V; and magnetic field level 4 at 30 A/m. The emissions table names BS EN / EN 61000-3-3 for voltage flicker without a numerical test level; it does not specify a harmonic-current limit. Confirm EMC compliance of the complete equipment after integration. Railway Environmental and Fire Tests The catalogue reports PASS for EN 50155 dry heat (section 13.4.5: 70°C for 6 hours and 85°C for 10 minutes); cyclic damp heat (13.4.8: 25–55°C, 90–100% RH, 48 hours); vibration (13.4.10: 19°C, 65% RH, 10 minutes); shock (13.4.10: 21 ±3°C, 65 ±5% RH, 30 ms ×18); low-temperature storage (13.4.6: −40°C, 16 hours); and salt mist (13.4.13: 35 ±2°C, 96 hours). These test conditions do not expand continuous operating limits. EN 45545-2:2020 results are marked PASS at HL1, HL2 and HL3 for all listed items: PCB R22 oxygen index, smoke density and smoke toxicity; PCB R24 oxygen index; PCB R25 glow-wire; potting R24 oxygen index; and terminal-block R26 vertical flame. Test methods are EN ISO 4589-2:2017, EN ISO 5659-2:2017, EN 17084:2018, EN 60695-2-11:2014 and EN 60695-11-10:2013 as applicable. Component results do not certify the entire vehicle or equipment.

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  MEAN WELL DDR-240 series: DIN Rail DC/DC Converter - DDR-240B-48

  The MEAN WELL DDR-240B-48 is a fanless DIN rail DC/DC converter rated at 48 V, 5 A and 240 W. Its B-code input supports 16.8–33.6 VDC continuously, with a separate 14.4–16.8 VDC band for 100 ms. The metal enclosure provides reinforced 4 kVDC input-to-output isolation, adjustable output, a DC OK relay, remote ON/OFF and active current sharing. A 360 W peak is available for up to 3 seconds under the specified temperature and loading conditions. Product Datasheet Download MEAN WELL DDR-240 Datasheet (PDF) The DDR-240 section is on PDF pages 23, 24, 25, 26, 27, 28, 29, 30, 31. Refer to the complete mechanical drawings and notes when planning installation. Model and Output Ratings Full model DDR-240B-48 Series DDR-240 Input code B DC output voltage 48 V Rated output current 5 A Rated output power 240 W Output current range 0–5 A Output voltage adjustment range 48–56 V Peak output current 7.5 A Peak output power 360 W Peak duration 3 seconds maximum Maximum ripple and noise 100 mVp-p Voltage tolerance ±1.0% Line regulation ±0.5% Load regulation ±1.0% Adjust the output with the front-panel Vo Adj. control and retain the current, power and thermal limits. The adjustment range is the specified voltage interval. Suitable applications include railway and industrial control, security, factory automation and telecommunications. The converter can provide DC voltage conversion, additional input/output insulation and compensation for cable voltage drop within its adjustment range. Input and Hold-up Performance Continuous DC input range 16.8–33.6 VDC 100 ms input range 14.4–16.8 VDC Reference DC input 24 VDC Typical efficiency 90% Typical DC input current 11.2 A at 24 VDC Typical inrush current 30 A Set-up / rise time 500 / 60 ms Minimum hold-up at 100% load 6 ms at 24 VDC Minimum hold-up at 70% load 10 ms at 24 VDC Supply interruption classification EN 50155:2021, S1 Normal measurement conditions 24 VDC input, rated load and 25°C ambient The 100 ms low-input band is a short-duration condition and does not extend the continuous input range. Apply the separate input-voltage derating curve before selecting the load. Use the dedicated model hold-up-versus-load curve for other load levels. A larger hold-up duration at reduced load is not a full-load rating. Ripple and noise are measured at 20 MHz bandwidth using a 12-inch twisted pair terminated by parallel 0.1 µF and 47 µF capacitors. Voltage tolerance includes set-up tolerance, line regulation and load regulation. Peak Loading and Protection Peak loading capability 150% of the model rated output power for the stated peak duration Protection functions Short circuit, overload, overvoltage, overtemperature, input reverse polarity and input undervoltage Sustained overload response Constant-current limiting at 105–135% of rated output power; automatic recovery after the overload is removed Overvoltage threshold 57.6–65 V Overvoltage recovery Output shutdown; reapply input power to recover Overtemperature recovery Output shutdown; reapply input power to recover Input undervoltage turn-on specification ≥16.8 VDC Input undervoltage turn-off specification ≤16.5 VDC Input undervoltage recovery Automatic when the input rises above the operating threshold Internal input fuse reference 2 × Conquer MST, 10 A, 250 V; time-lag The catalogue shows two loading examples: 240 W for 100 seconds followed by 360 W for 3 seconds; or 120 W for 10 seconds followed by 360 W for 3 seconds. These are conditional pulse-load patterns; peak power is not a continuous rating. Apply the peak-temperature curve as well as the continuous-load limits. After the initial peak interval, a sustained overload enters the specified constant-current protection region. Keep planned peaks within 3 seconds; the overload-protection response does not authorize a longer peak interval. A MOSFET in series with the negative input prevents output when input polarity is reversed. Correct the polarity before restoring operation. A start-up resistor limits inrush current and is then bypassed by a MOSFET. The fuse references identify internal protection components; they are not an external fuse-selection instruction. Current Sharing Maximum parallel units 4 Output-voltage matching Difference strictly less than 0.2 V Total output-current limit Rated current per unit × number of units × 0.9 Minimum parallel load Strictly greater than 3% × rated current per unit × number of units Four-unit current limit at the stated unit ratings 18 A Current-sharing connections Connect P+ to P+ and P− to P− across all participating units The series specification describes current sharing up to 960 W (3+1 units). Size the usable load with the 0.9 current formula, the actual model rating and all applicable derating conditions. The headline aggregate rating is not an unconditional usable load or N+1 capacity guarantee. Use matching output-voltage units, connect the outputs and sharing terminals as illustrated, and adjust their output-voltage differences to less than 0.2 V. Consult the manufacturer for arrangements beyond four units. DC OK Relay and Remote ON/OFF DC OK contact closed Power supply on / DC OK DC OK contact open Power supply off / DC fail Maximum DC OK contact rating 30 VDC, 1 A resistive load Remote-control terminals TB1 pin 4 relative to TB1 pin 2 (−Vin) Output ON Remote input open, or 4–10 VDC Output OFF Remote input shorted, or 0–0.8 VDC Front-panel indication DC OK indicator Observe the relay contact rating when connecting an external monitoring circuit. Remote ON/OFF controls the converter output; disconnect the DC input before installing or servicing wiring. Terminal Assignment and Wiring TB1 pin 1 FG / protective earth TB1 pin 2 DC input −Vin TB1 pin 3 DC input +Vin TB1 pin 4 Remote ON/OFF TB2 pins 1, 2 DC output +Vo TB2 pins 3, 4 DC OK relay contact TB3 pins 5, 6 DC output −Vo TB3 pin 7 P+ current sharing TB3 pin 8 P− current sharing Observe the numbered terminals in the mechanical drawing. Connect FG to the installation protective-earth system and size the DC conductors and terminations for this model’s input and output currents. Keep the DC OK contacts separate from the DC power and current-sharing connections. Allow access to the terminals, Vo Adj. control and rail latch after installation. Cooling, Temperature and Input Derating Cooling Free-air convection; fanless Required orientation for the published curves Vertical Working ambient range −40 to +70°C, subject to derating Continuous-load temperature curve 100% through 50°C; reduce along the plotted line to 40% at 70°C Full 150% peak temperature range −40 to +50°C, within the peak-duration limit Load at minimum continuous input 80% Input for 100% load 21.6 VDC and above within the continuous input range Operating altitude Up to 5000 m Altitude temperature derating Above 2000 m: reduce permitted ambient temperature by 3.5°C per additional 1000 m Input-voltage and temperature limits apply together. At low input, follow the rising input-derating line between the minimum continuous voltage and the full-load input point; short-duration input operation is not a full-load continuous extension. Above 50°C, reduce the allowed 3-second peak according to the separate upper curve; the plotted 60°C peak point is 120% load. Continuous output is separately limited by the lower curve. Provide unobstructed airflow around the installed converter. Do not treat the ambient range, peak capability or altitude statement as an unconditional full-load rating. Environmental and Mechanical Data Working humidity 5–95% RH, non-condensing Storage temperature / humidity −40 to +85°C; 5–95% RH, non-condensing Temperature coefficient ±0.03%/°C over 0–55°C Component vibration 10–500 Hz, 5 G; 10 minutes per cycle; 60 minutes on each X, Y and Z axis Vibration mounting requirement Compliance with IEC 61373 Catalogue body dimensions, W × H × D 40 × 125.2 × 113.5 mm Case reference 265A-D Drawing tolerance ±1 mm DIN rail compatibility TS35/7.5 or TS35/15 Rail supply status Reference rail shown; not included with the unit Unit mass, catalogue PACKING reference 760 g Catalogue packing 0.76 kg; 20 units / 16.2 kg / 1.0 CUFT Minimum MTBF 1415.6K hours, Telcordia SR-332 (Bellcore); 189.9K hours, MIL-HDBK-217F at 25°C Nominal switching frequency 80 kHz Catalogue warranty 3 years Use the illustrated DIN rail mounting and removal arrangement. The body dimensions do not include the installed rail, external wiring or cable-bend clearance. Select the rail and installation hardware for the enclosure. The listed mass is the explicit per-unit catalogue packing reference; it is not a measured installation mass or the gross mass of an individual shipping box. Safety, Isolation and EMC Catalogue-listed safety approvals IEC 62368-1; UL 62368-1; AS/NZS 62368-1; EAC TP TC 004 Input-to-output isolation 4 kVDC; reinforced isolation Input-to-FG withstand voltage 2.5 kVDC Output-to-FG withstand voltage 0.71 kVDC Isolation resistance >100 MΩ between input–output, input–FG and output–FG at 500 VDC, 25°C and 70% RH Conducted emissions BS EN / EN 55032, Class B Radiated emissions BS EN / EN 55032, Class B Immunity standards BS EN / EN 55035; BS EN / EN 61000-6-2 (EN 50082-2) Railway standards BS EN / EN 50155; IEC 60571; IEC 61373 shock and vibration; BS EN / EN 50121-3-2 EMC; BS EN / EN 45545-2 fire protection The six listed immunity tests use criterion A: ESD level 3 at 8 kV air and 6 kV contact; radiated RF level 3 at 10 V/m; EFT/burst level 3 at 2 kV; surge level 3 at 1 kV line–line and 2 kV line–line–FG; conducted RF level 3 at 10 V; and magnetic field level 4 at 30 A/m. The emissions table names BS EN / EN 61000-3-3 for voltage flicker without a numerical test level; it does not specify a harmonic-current limit. Confirm EMC compliance of the complete equipment after integration. Railway Environmental and Fire Tests The catalogue reports PASS for EN 50155 dry heat (section 13.4.5: 70°C for 6 hours and 85°C for 10 minutes); cyclic damp heat (13.4.8: 25–55°C, 90–100% RH, 48 hours); vibration (13.4.10: 19°C, 65% RH, 10 minutes); shock (13.4.10: 21 ±3°C, 65 ±5% RH, 30 ms ×18); low-temperature storage (13.4.6: −40°C, 16 hours); and salt mist (13.4.13: 35 ±2°C, 96 hours). These test conditions do not expand continuous operating limits. EN 45545-2:2020 results are marked PASS at HL1, HL2 and HL3 for all listed items: PCB R22 oxygen index, smoke density and smoke toxicity; PCB R24 oxygen index; PCB R25 glow-wire; potting R24 oxygen index; and terminal-block R26 vertical flame. Test methods are EN ISO 4589-2:2017, EN ISO 5659-2:2017, EN 17084:2018, EN 60695-2-11:2014 and EN 60695-11-10:2013 as applicable. Component results do not certify the entire vehicle or equipment.

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  MEAN WELL DDR-240 series: DIN Rail DC/DC Converter - DDR-240B-24

  The MEAN WELL DDR-240B-24 is a fanless DIN rail DC/DC converter rated at 24 V, 10 A and 240 W. Its B-code input supports 16.8–33.6 VDC continuously, with a separate 14.4–16.8 VDC band for 100 ms. The metal enclosure provides reinforced 4 kVDC input-to-output isolation, adjustable output, a DC OK relay, remote ON/OFF and active current sharing. A 360 W peak is available for up to 3 seconds under the specified temperature and loading conditions. Product Datasheet Download MEAN WELL DDR-240 Datasheet (PDF) The DDR-240 section is on PDF pages 23, 24, 25, 26, 27, 28, 29, 30, 31. Refer to the complete mechanical drawings and notes when planning installation. Model and Output Ratings Full model DDR-240B-24 Series DDR-240 Input code B DC output voltage 24 V Rated output current 10 A Rated output power 240 W Output current range 0–10 A Output voltage adjustment range 24–28 V Peak output current 15 A Peak output power 360 W Peak duration 3 seconds maximum Maximum ripple and noise 80 mVp-p Voltage tolerance ±1.0% Line regulation ±0.5% Load regulation ±1.0% Adjust the output with the front-panel Vo Adj. control and retain the current, power and thermal limits. The adjustment range is the specified voltage interval. Suitable applications include railway and industrial control, security, factory automation and telecommunications. The converter can provide DC voltage conversion, additional input/output insulation and compensation for cable voltage drop within its adjustment range. Input and Hold-up Performance Continuous DC input range 16.8–33.6 VDC 100 ms input range 14.4–16.8 VDC Reference DC input 24 VDC Typical efficiency 90% Typical DC input current 11.2 A at 24 VDC Typical inrush current 30 A Set-up / rise time 500 / 60 ms Minimum hold-up at 100% load 6 ms at 24 VDC Minimum hold-up at 70% load 10 ms at 24 VDC Supply interruption classification EN 50155:2021, S1 Normal measurement conditions 24 VDC input, rated load and 25°C ambient The 100 ms low-input band is a short-duration condition and does not extend the continuous input range. Apply the separate input-voltage derating curve before selecting the load. Use the dedicated model hold-up-versus-load curve for other load levels. A larger hold-up duration at reduced load is not a full-load rating. Ripple and noise are measured at 20 MHz bandwidth using a 12-inch twisted pair terminated by parallel 0.1 µF and 47 µF capacitors. Voltage tolerance includes set-up tolerance, line regulation and load regulation. Peak Loading and Protection Peak loading capability 150% of the model rated output power for the stated peak duration Protection functions Short circuit, overload, overvoltage, overtemperature, input reverse polarity and input undervoltage Sustained overload response Constant-current limiting at 105–135% of rated output power; automatic recovery after the overload is removed Overvoltage threshold 28.8–35 V Overvoltage recovery Output shutdown; reapply input power to recover Overtemperature recovery Output shutdown; reapply input power to recover Input undervoltage turn-on specification ≥16.8 VDC Input undervoltage turn-off specification ≤16.5 VDC Input undervoltage recovery Automatic when the input rises above the operating threshold Internal input fuse reference 2 × Conquer MST, 10 A, 250 V; time-lag The catalogue shows two loading examples: 240 W for 100 seconds followed by 360 W for 3 seconds; or 120 W for 10 seconds followed by 360 W for 3 seconds. These are conditional pulse-load patterns; peak power is not a continuous rating. Apply the peak-temperature curve as well as the continuous-load limits. After the initial peak interval, a sustained overload enters the specified constant-current protection region. Keep planned peaks within 3 seconds; the overload-protection response does not authorize a longer peak interval. A MOSFET in series with the negative input prevents output when input polarity is reversed. Correct the polarity before restoring operation. A start-up resistor limits inrush current and is then bypassed by a MOSFET. The fuse references identify internal protection components; they are not an external fuse-selection instruction. Current Sharing Maximum parallel units 4 Output-voltage matching Difference strictly less than 0.2 V Total output-current limit Rated current per unit × number of units × 0.9 Minimum parallel load Strictly greater than 3% × rated current per unit × number of units Four-unit current limit at the stated unit ratings 36 A Current-sharing connections Connect P+ to P+ and P− to P− across all participating units The series specification describes current sharing up to 960 W (3+1 units). Size the usable load with the 0.9 current formula, the actual model rating and all applicable derating conditions. The headline aggregate rating is not an unconditional usable load or N+1 capacity guarantee. Use matching output-voltage units, connect the outputs and sharing terminals as illustrated, and adjust their output-voltage differences to less than 0.2 V. Consult the manufacturer for arrangements beyond four units. DC OK Relay and Remote ON/OFF DC OK contact closed Power supply on / DC OK DC OK contact open Power supply off / DC fail Maximum DC OK contact rating 30 VDC, 1 A resistive load Remote-control terminals TB1 pin 4 relative to TB1 pin 2 (−Vin) Output ON Remote input open, or 4–10 VDC Output OFF Remote input shorted, or 0–0.8 VDC Front-panel indication DC OK indicator Observe the relay contact rating when connecting an external monitoring circuit. Remote ON/OFF controls the converter output; disconnect the DC input before installing or servicing wiring. Terminal Assignment and Wiring TB1 pin 1 FG / protective earth TB1 pin 2 DC input −Vin TB1 pin 3 DC input +Vin TB1 pin 4 Remote ON/OFF TB2 pins 1, 2 DC output +Vo TB2 pins 3, 4 DC OK relay contact TB3 pins 5, 6 DC output −Vo TB3 pin 7 P+ current sharing TB3 pin 8 P− current sharing Observe the numbered terminals in the mechanical drawing. Connect FG to the installation protective-earth system and size the DC conductors and terminations for this model’s input and output currents. Keep the DC OK contacts separate from the DC power and current-sharing connections. Allow access to the terminals, Vo Adj. control and rail latch after installation. Cooling, Temperature and Input Derating Cooling Free-air convection; fanless Required orientation for the published curves Vertical Working ambient range −40 to +70°C, subject to derating Continuous-load temperature curve 100% through 50°C; reduce along the plotted line to 40% at 70°C Full 150% peak temperature range −40 to +50°C, within the peak-duration limit Load at minimum continuous input 80% Input for 100% load 21.6 VDC and above within the continuous input range Operating altitude Up to 5000 m Altitude temperature derating Above 2000 m: reduce permitted ambient temperature by 3.5°C per additional 1000 m Input-voltage and temperature limits apply together. At low input, follow the rising input-derating line between the minimum continuous voltage and the full-load input point; short-duration input operation is not a full-load continuous extension. Above 50°C, reduce the allowed 3-second peak according to the separate upper curve; the plotted 60°C peak point is 120% load. Continuous output is separately limited by the lower curve. Provide unobstructed airflow around the installed converter. Do not treat the ambient range, peak capability or altitude statement as an unconditional full-load rating. Environmental and Mechanical Data Working humidity 5–95% RH, non-condensing Storage temperature / humidity −40 to +85°C; 5–95% RH, non-condensing Temperature coefficient ±0.03%/°C over 0–55°C Component vibration 10–500 Hz, 5 G; 10 minutes per cycle; 60 minutes on each X, Y and Z axis Vibration mounting requirement Compliance with IEC 61373 Catalogue body dimensions, W × H × D 40 × 125.2 × 113.5 mm Case reference 265A-D Drawing tolerance ±1 mm DIN rail compatibility TS35/7.5 or TS35/15 Rail supply status Reference rail shown; not included with the unit Unit mass, catalogue PACKING reference 760 g Catalogue packing 0.76 kg; 20 units / 16.2 kg / 1.0 CUFT Minimum MTBF 1415.6K hours, Telcordia SR-332 (Bellcore); 189.9K hours, MIL-HDBK-217F at 25°C Nominal switching frequency 80 kHz Catalogue warranty 3 years Use the illustrated DIN rail mounting and removal arrangement. The body dimensions do not include the installed rail, external wiring or cable-bend clearance. Select the rail and installation hardware for the enclosure. The listed mass is the explicit per-unit catalogue packing reference; it is not a measured installation mass or the gross mass of an individual shipping box. Safety, Isolation and EMC Catalogue-listed safety approvals IEC 62368-1; UL 62368-1; AS/NZS 62368-1; EAC TP TC 004 Input-to-output isolation 4 kVDC; reinforced isolation Input-to-FG withstand voltage 2.5 kVDC Output-to-FG withstand voltage 0.71 kVDC Isolation resistance >100 MΩ between input–output, input–FG and output–FG at 500 VDC, 25°C and 70% RH Conducted emissions BS EN / EN 55032, Class B Radiated emissions BS EN / EN 55032, Class B Immunity standards BS EN / EN 55035; BS EN / EN 61000-6-2 (EN 50082-2) Railway standards BS EN / EN 50155; IEC 60571; IEC 61373 shock and vibration; BS EN / EN 50121-3-2 EMC; BS EN / EN 45545-2 fire protection The six listed immunity tests use criterion A: ESD level 3 at 8 kV air and 6 kV contact; radiated RF level 3 at 10 V/m; EFT/burst level 3 at 2 kV; surge level 3 at 1 kV line–line and 2 kV line–line–FG; conducted RF level 3 at 10 V; and magnetic field level 4 at 30 A/m. The emissions table names BS EN / EN 61000-3-3 for voltage flicker without a numerical test level; it does not specify a harmonic-current limit. Confirm EMC compliance of the complete equipment after integration. Railway Environmental and Fire Tests The catalogue reports PASS for EN 50155 dry heat (section 13.4.5: 70°C for 6 hours and 85°C for 10 minutes); cyclic damp heat (13.4.8: 25–55°C, 90–100% RH, 48 hours); vibration (13.4.10: 19°C, 65% RH, 10 minutes); shock (13.4.10: 21 ±3°C, 65 ±5% RH, 30 ms ×18); low-temperature storage (13.4.6: −40°C, 16 hours); and salt mist (13.4.13: 35 ±2°C, 96 hours). These test conditions do not expand continuous operating limits. EN 45545-2:2020 results are marked PASS at HL1, HL2 and HL3 for all listed items: PCB R22 oxygen index, smoke density and smoke toxicity; PCB R24 oxygen index; PCB R25 glow-wire; potting R24 oxygen index; and terminal-block R26 vertical flame. Test methods are EN ISO 4589-2:2017, EN ISO 5659-2:2017, EN 17084:2018, EN 60695-2-11:2014 and EN 60695-11-10:2013 as applicable. Component results do not certify the entire vehicle or equipment.

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  MEAN WELL DDR-120 series: DIN Rail DC/DC Converter - DDR-120D-48

  The MEAN WELL DDR-120D-48 is an isolated DIN rail DC/DC converter providing 48 V at up to 2.5 A (120 W). Its D-code input accepts 67.2–154 VDC. The 32 mm-wide, fanless metal enclosure mounts on TS-35/7.5 or TS-35/15 rail. Adjustable output, 4 kVDC reinforced input-to-output isolation and short-duration peak capability support industrial control, transport and communications equipment within the ratings below. Product Datasheet Download MEAN WELL DDR-120 Datasheet (PDF) The DDR-120 section is on PDF pages 14, 15, 16, 17, 18, 19, 20, 21, 22. Refer to the complete mechanical drawings and notes when planning installation. Model and Output Ratings Full model DDR-120D-48 Series DDR-120 Input code D: 110 VDC nominal test input Output code 48: 48 VDC nominal output DC output voltage 48 V Rated output current 2.5 A Rated output power 120 W Output current range 0–2.5 A Output voltage adjustment 48–56 V Maximum ripple and noise 50 mVp-p Voltage tolerance ±1.0% Line regulation ±0.5% Load regulation ±1.0% Choose the load using the ratings of this complete model. The series name does not mean that every input version delivers 120 W. DC Input and Performance Specified DC input range 67.2–154 VDC Typical efficiency 91.5% Typical input current 1.3 A at 110 VDC Typical inrush current 5 A at 110 VDC Set-up / rise time 500 / 60 ms at 110 VDC Input undervoltage thresholds Power on ≥67.2 V; power off ≤65 V Supply-interruption classification EN 50155:2021, S1 Hold-up time Load-dependent; see the DDR-120D-48 curve on PDF page 20 Switching frequency 65 kHz, as shown in the block diagram Unless otherwise specified, catalogue measurements use 110 VDC input, rated load and 25°C ambient. Efficiency and input current are typical values, not guarantees at every operating point. Ripple and noise are measured with 20 MHz bandwidth and a 12-inch twisted pair terminated by 0.1 µF and 47 µF capacitors in parallel. Voltage tolerance includes set-up tolerance, line regulation and load regulation. During start-up, a current-limiting circuit suppresses inrush. A MOSFET bypass reduces losses after start-up. Short-Duration Peak Loads Catalogue peak current 3.75 A Catalogue peak power 180 W Maximum peak duration 3 seconds; subject to the peak-loading and derating curves Catalogue loading example 1 100% base load for 100 seconds, followed by 150% load for 3 seconds Catalogue loading example 2 40% base load for 10 seconds, followed by 150% load for 3 seconds The peak rating is for short load events, not continuous output. Follow the complete temperature, input-voltage and repetition conditions on PDF page 17. The two loading diagrams are specific examples; they do not establish a universal duty cycle for every application. Protection Short-circuit protection Included Overload protection After the short peak-load interval, constant-current limiting at 105–135% of rated output power; automatic recovery Overvoltage threshold 57.6–67.2 V Overvoltage recovery Output shuts down; reapply input power to recover Input reverse-polarity protection Internal series MOSFET in the negative input opens on reversed polarity; automatic recovery after the fault is removed Input undervoltage protection Output shuts down below the control threshold and restarts automatically when the input voltage recovers Limit planned peak operation to the 3-second maximum stated in the specification note. Do not use the overload-protection delay as a continuous-load rating. Cooling, Derating and Environment Cooling Fanless free-air convection; vertical mounting Working temperature −40 to +70°C, with derating Continuous thermal loading 100% through +55°C; 80% at +60°C; 40% at +70°C, following the linear derating curve Low-input loading 90% in the low-input region below 86.4 VDC; full rated load from 86.4 VDC within the specified range Working humidity 5–95% RH, non-condensing Storage temperature and humidity −40 to +85°C; 5–95% RH, non-condensing Temperature coefficient ±0.03%/°C from 0 to 55°C Operating altitude Up to 5000 m; reduce the allowed ambient temperature by 3.5°C per 1000 m above 2000 m Component vibration test 10–500 Hz, 5 G; 10 minutes per cycle, 60 minutes on each X, Y and Z axis Mounting vibration reference IEC 61373 Apply temperature and low-input derating together. The 70°C operating limit does not mean full continuous power is available at 70°C. Maintain the intended vertical orientation and an unobstructed convection path. Dimensions, Connections and Installation Parts Dimensions, W × H × D 32 × 125.2 × 102 mm Mechanical case 221; drawing tolerance ±1 mm Compatible DIN rails TS-35/7.5 or TS-35/15 Input terminal block TB1 Pin 1: FG; pin 2: DC input −Vin; pin 3: DC input +Vin Output terminal block TB2 Pins 1 and 2: DC output −Vo; pins 3 and 4: DC output +Vo Output adjustment Front-panel voltage adjustment; use the model-specific adjustment range Internal input fuse reference 1 × Conquer MST, 4 A / 250 V; time-lag type Use the terminal numbers on the mechanical drawing on PDF page 22 and observe input/output polarity and frame-ground connections. The two side holes marked “No Use” are not mounting points. TS-35/7.5 and TS-35/15 identify the supported mounting-rail profiles. The catalogue does not state that a rail is supplied. Conquer MST identifies the internal fuse component and rating, not an additional MEAN WELL accessory included with the converter. Isolation and Standards Input-to-output isolation 4 kVDC, reinforced isolation Input-to-FG withstand voltage 2.5 kVDC Output-to-FG withstand voltage 2.5 kVDC Insulation resistance Input–output, input–FG and output–FG: >100 MΩ at 500 VDC, 25°C and 70% RH Catalogue-listed safety approvals IEC 62368-1, UL 62368-1, EAC TP TC 004 and AS/NZS 62368.1 Safety design reference UL 508 EMC emission BS EN / EN 55032: Class B conducted and radiated emissions EMC immunity BS EN / EN 55035 and BS EN / EN 61000-6-2; listed tests use performance criterion A Railway references BS EN / EN 50155; IEC 60571; IEC 61373 shock and vibration; BS EN / EN 45545-2 fire protection Railway EMC reference BS EN / EN 50121-3-2 The final equipment must still be checked for compliance with applicable EMC requirements. PDF page 21 records material-specific EN 45545-2 fire tests and environmental tests; these results do not certify every completed system or installation. Mass and Catalogue References Mass, catalogue PACKING reference per unit 510 g Catalogue packing 510 g; 28 units / 15.3 kg / 1.23 CUFT Minimum MTBF 1769.5K hours, Telcordia SR-332; 214.5K hours, MIL-HDBK-217F at 25°C Catalogue warranty 3 years The stated mass is the single-unit reference in the catalogue PACKING field. It is not a measured shipment weight.

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  MEAN WELL DDR-120 series: DIN Rail DC/DC Converter - DDR-120D-24

  The MEAN WELL DDR-120D-24 is an isolated DIN rail DC/DC converter providing 24 V at up to 5 A (120 W). Its D-code input accepts 67.2–154 VDC. The 32 mm-wide, fanless metal enclosure mounts on TS-35/7.5 or TS-35/15 rail. Adjustable output, 4 kVDC reinforced input-to-output isolation and short-duration peak capability support industrial control, transport and communications equipment within the ratings below. Product Datasheet Download MEAN WELL DDR-120 Datasheet (PDF) The DDR-120 section is on PDF pages 14, 15, 16, 17, 18, 19, 20, 21, 22. Refer to the complete mechanical drawings and notes when planning installation. Model and Output Ratings Full model DDR-120D-24 Series DDR-120 Input code D: 110 VDC nominal test input Output code 24: 24 VDC nominal output DC output voltage 24 V Rated output current 5 A Rated output power 120 W Output current range 0–5 A Output voltage adjustment 24–28 V Maximum ripple and noise 50 mVp-p Voltage tolerance ±1.0% Line regulation ±0.5% Load regulation ±1.0% Choose the load using the ratings of this complete model. The series name does not mean that every input version delivers 120 W. DC Input and Performance Specified DC input range 67.2–154 VDC Typical efficiency 91% Typical input current 1.3 A at 110 VDC Typical inrush current 5 A at 110 VDC Set-up / rise time 500 / 60 ms at 110 VDC Input undervoltage thresholds Power on ≥67.2 V; power off ≤65 V Supply-interruption classification EN 50155:2021, S1 Hold-up time Load-dependent; see the DDR-120D-24 curve on PDF page 20 Switching frequency 65 kHz, as shown in the block diagram Unless otherwise specified, catalogue measurements use 110 VDC input, rated load and 25°C ambient. Efficiency and input current are typical values, not guarantees at every operating point. Ripple and noise are measured with 20 MHz bandwidth and a 12-inch twisted pair terminated by 0.1 µF and 47 µF capacitors in parallel. Voltage tolerance includes set-up tolerance, line regulation and load regulation. During start-up, a current-limiting circuit suppresses inrush. A MOSFET bypass reduces losses after start-up. Short-Duration Peak Loads Catalogue peak current 7.5 A Catalogue peak power 180 W Maximum peak duration 3 seconds; subject to the peak-loading and derating curves Catalogue loading example 1 100% base load for 100 seconds, followed by 150% load for 3 seconds Catalogue loading example 2 40% base load for 10 seconds, followed by 150% load for 3 seconds The peak rating is for short load events, not continuous output. Follow the complete temperature, input-voltage and repetition conditions on PDF page 17. The two loading diagrams are specific examples; they do not establish a universal duty cycle for every application. Protection Short-circuit protection Included Overload protection After the short peak-load interval, constant-current limiting at 105–135% of rated output power; automatic recovery Overvoltage threshold 28.8–33.6 V Overvoltage recovery Output shuts down; reapply input power to recover Input reverse-polarity protection Internal series MOSFET in the negative input opens on reversed polarity; automatic recovery after the fault is removed Input undervoltage protection Output shuts down below the control threshold and restarts automatically when the input voltage recovers Limit planned peak operation to the 3-second maximum stated in the specification note. Do not use the overload-protection delay as a continuous-load rating. Cooling, Derating and Environment Cooling Fanless free-air convection; vertical mounting Working temperature −40 to +70°C, with derating Continuous thermal loading 100% through +55°C; 80% at +60°C; 40% at +70°C, following the linear derating curve Low-input loading 90% in the low-input region below 86.4 VDC; full rated load from 86.4 VDC within the specified range Working humidity 5–95% RH, non-condensing Storage temperature and humidity −40 to +85°C; 5–95% RH, non-condensing Temperature coefficient ±0.03%/°C from 0 to 55°C Operating altitude Up to 5000 m; reduce the allowed ambient temperature by 3.5°C per 1000 m above 2000 m Component vibration test 10–500 Hz, 5 G; 10 minutes per cycle, 60 minutes on each X, Y and Z axis Mounting vibration reference IEC 61373 Apply temperature and low-input derating together. The 70°C operating limit does not mean full continuous power is available at 70°C. Maintain the intended vertical orientation and an unobstructed convection path. Dimensions, Connections and Installation Parts Dimensions, W × H × D 32 × 125.2 × 102 mm Mechanical case 221; drawing tolerance ±1 mm Compatible DIN rails TS-35/7.5 or TS-35/15 Input terminal block TB1 Pin 1: FG; pin 2: DC input −Vin; pin 3: DC input +Vin Output terminal block TB2 Pins 1 and 2: DC output −Vo; pins 3 and 4: DC output +Vo Output adjustment Front-panel voltage adjustment; use the model-specific adjustment range Internal input fuse reference 1 × Conquer MST, 4 A / 250 V; time-lag type Use the terminal numbers on the mechanical drawing on PDF page 22 and observe input/output polarity and frame-ground connections. The two side holes marked “No Use” are not mounting points. TS-35/7.5 and TS-35/15 identify the supported mounting-rail profiles. The catalogue does not state that a rail is supplied. Conquer MST identifies the internal fuse component and rating, not an additional MEAN WELL accessory included with the converter. Isolation and Standards Input-to-output isolation 4 kVDC, reinforced isolation Input-to-FG withstand voltage 2.5 kVDC Output-to-FG withstand voltage 2.5 kVDC Insulation resistance Input–output, input–FG and output–FG: >100 MΩ at 500 VDC, 25°C and 70% RH Catalogue-listed safety approvals IEC 62368-1, UL 62368-1, EAC TP TC 004 and AS/NZS 62368.1 Safety design reference UL 508 EMC emission BS EN / EN 55032: Class B conducted and radiated emissions EMC immunity BS EN / EN 55035 and BS EN / EN 61000-6-2; listed tests use performance criterion A Railway references BS EN / EN 50155; IEC 60571; IEC 61373 shock and vibration; BS EN / EN 45545-2 fire protection Railway EMC reference BS EN / EN 50121-3-2 The final equipment must still be checked for compliance with applicable EMC requirements. PDF page 21 records material-specific EN 45545-2 fire tests and environmental tests; these results do not certify every completed system or installation. Mass and Catalogue References Mass, catalogue PACKING reference per unit 510 g Catalogue packing 510 g; 28 units / 15.3 kg / 1.23 CUFT Minimum MTBF 1769.5K hours, Telcordia SR-332; 214.5K hours, MIL-HDBK-217F at 25°C Catalogue warranty 3 years The stated mass is the single-unit reference in the catalogue PACKING field. It is not a measured shipment weight.

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  MEAN WELL DDR-120 series: DIN Rail DC/DC Converter - DDR-120D-12

  The MEAN WELL DDR-120D-12 is an isolated DIN rail DC/DC converter providing 12 V at up to 10 A (120 W). Its D-code input accepts 67.2–154 VDC. The 32 mm-wide, fanless metal enclosure mounts on TS-35/7.5 or TS-35/15 rail. Adjustable output, 4 kVDC reinforced input-to-output isolation and short-duration peak capability support industrial control, transport and communications equipment within the ratings below. Product Datasheet Download MEAN WELL DDR-120 Datasheet (PDF) The DDR-120 section is on PDF pages 14, 15, 16, 17, 18, 19, 20, 21, 22. Refer to the complete mechanical drawings and notes when planning installation. Model and Output Ratings Full model DDR-120D-12 Series DDR-120 Input code D: 110 VDC nominal test input Output code 12: 12 VDC nominal output DC output voltage 12 V Rated output current 10 A Rated output power 120 W Output current range 0–10 A Output voltage adjustment 9–14 V Maximum ripple and noise 50 mVp-p Voltage tolerance ±1.0% Line regulation ±0.5% Load regulation ±1.0% Choose the load using the ratings of this complete model. The series name does not mean that every input version delivers 120 W. DC Input and Performance Specified DC input range 67.2–154 VDC Typical efficiency 89.5% Typical input current 1.3 A at 110 VDC Typical inrush current 5 A at 110 VDC Set-up / rise time 500 / 60 ms at 110 VDC Input undervoltage thresholds Power on ≥67.2 V; power off ≤65 V Supply-interruption classification EN 50155:2021, S1 Hold-up time Load-dependent; see the DDR-120D-12 curve on PDF page 20 Switching frequency 65 kHz, as shown in the block diagram Unless otherwise specified, catalogue measurements use 110 VDC input, rated load and 25°C ambient. Efficiency and input current are typical values, not guarantees at every operating point. Ripple and noise are measured with 20 MHz bandwidth and a 12-inch twisted pair terminated by 0.1 µF and 47 µF capacitors in parallel. Voltage tolerance includes set-up tolerance, line regulation and load regulation. During start-up, a current-limiting circuit suppresses inrush. A MOSFET bypass reduces losses after start-up. Short-Duration Peak Loads Catalogue peak current 15 A Catalogue peak power 180 W Maximum peak duration 3 seconds; subject to the peak-loading and derating curves Catalogue loading example 1 100% base load for 100 seconds, followed by 150% load for 3 seconds Catalogue loading example 2 40% base load for 10 seconds, followed by 150% load for 3 seconds The peak rating is for short load events, not continuous output. Follow the complete temperature, input-voltage and repetition conditions on PDF page 17. The two loading diagrams are specific examples; they do not establish a universal duty cycle for every application. Protection Short-circuit protection Included Overload protection After the short peak-load interval, constant-current limiting at 105–135% of rated output power; automatic recovery Overvoltage threshold 14.4–16.8 V Overvoltage recovery Output shuts down; reapply input power to recover Input reverse-polarity protection Internal series MOSFET in the negative input opens on reversed polarity; automatic recovery after the fault is removed Input undervoltage protection Output shuts down below the control threshold and restarts automatically when the input voltage recovers Limit planned peak operation to the 3-second maximum stated in the specification note. Do not use the overload-protection delay as a continuous-load rating. Cooling, Derating and Environment Cooling Fanless free-air convection; vertical mounting Working temperature −40 to +70°C, with derating Continuous thermal loading 100% through +55°C; 80% at +60°C; 40% at +70°C, following the linear derating curve Low-input loading 90% in the low-input region below 86.4 VDC; full rated load from 86.4 VDC within the specified range Working humidity 5–95% RH, non-condensing Storage temperature and humidity −40 to +85°C; 5–95% RH, non-condensing Temperature coefficient ±0.03%/°C from 0 to 55°C Operating altitude Up to 5000 m; reduce the allowed ambient temperature by 3.5°C per 1000 m above 2000 m Component vibration test 10–500 Hz, 5 G; 10 minutes per cycle, 60 minutes on each X, Y and Z axis Mounting vibration reference IEC 61373 Apply temperature and low-input derating together. The 70°C operating limit does not mean full continuous power is available at 70°C. Maintain the intended vertical orientation and an unobstructed convection path. Dimensions, Connections and Installation Parts Dimensions, W × H × D 32 × 125.2 × 102 mm Mechanical case 221; drawing tolerance ±1 mm Compatible DIN rails TS-35/7.5 or TS-35/15 Input terminal block TB1 Pin 1: FG; pin 2: DC input −Vin; pin 3: DC input +Vin Output terminal block TB2 Pins 1 and 2: DC output −Vo; pins 3 and 4: DC output +Vo Output adjustment Front-panel voltage adjustment; use the model-specific adjustment range Internal input fuse reference 1 × Conquer MST, 4 A / 250 V; time-lag type Use the terminal numbers on the mechanical drawing on PDF page 22 and observe input/output polarity and frame-ground connections. The two side holes marked “No Use” are not mounting points. TS-35/7.5 and TS-35/15 identify the supported mounting-rail profiles. The catalogue does not state that a rail is supplied. Conquer MST identifies the internal fuse component and rating, not an additional MEAN WELL accessory included with the converter. Isolation and Standards Input-to-output isolation 4 kVDC, reinforced isolation Input-to-FG withstand voltage 2.5 kVDC Output-to-FG withstand voltage 2.5 kVDC Insulation resistance Input–output, input–FG and output–FG: >100 MΩ at 500 VDC, 25°C and 70% RH Catalogue-listed safety approvals IEC 62368-1, UL 62368-1, EAC TP TC 004 and AS/NZS 62368.1 Safety design reference UL 508 EMC emission BS EN / EN 55032: Class B conducted and radiated emissions EMC immunity BS EN / EN 55035 and BS EN / EN 61000-6-2; listed tests use performance criterion A Railway references BS EN / EN 50155; IEC 60571; IEC 61373 shock and vibration; BS EN / EN 45545-2 fire protection Railway EMC reference BS EN / EN 50121-3-2 The final equipment must still be checked for compliance with applicable EMC requirements. PDF page 21 records material-specific EN 45545-2 fire tests and environmental tests; these results do not certify every completed system or installation. Mass and Catalogue References Mass, catalogue PACKING reference per unit 510 g Catalogue packing 510 g; 28 units / 15.3 kg / 1.23 CUFT Minimum MTBF 1769.5K hours, Telcordia SR-332; 214.5K hours, MIL-HDBK-217F at 25°C Catalogue warranty 3 years The stated mass is the single-unit reference in the catalogue PACKING field. It is not a measured shipment weight.

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  MEAN WELL DDR-120 series: DIN Rail DC/DC Converter - DDR-120C-48

  The MEAN WELL DDR-120C-48 is an isolated DIN rail DC/DC converter providing 48 V at up to 2.5 A (120 W). Its C-code input accepts 33.6–67.2 VDC. The 32 mm-wide, fanless metal enclosure mounts on TS-35/7.5 or TS-35/15 rail. Adjustable output, 4 kVDC reinforced input-to-output isolation and short-duration peak capability support industrial control, transport and communications equipment within the ratings below. Product Datasheet Download MEAN WELL DDR-120 Datasheet (PDF) The DDR-120 section is on PDF pages 14, 15, 16, 17, 18, 19, 20, 21, 22. Refer to the complete mechanical drawings and notes when planning installation. Model and Output Ratings Full model DDR-120C-48 Series DDR-120 Input code C: 48 VDC nominal test input Output code 48: 48 VDC nominal output DC output voltage 48 V Rated output current 2.5 A Rated output power 120 W Output current range 0–2.5 A Output voltage adjustment 48–56 V Maximum ripple and noise 50 mVp-p Voltage tolerance ±1.0% Line regulation ±0.5% Load regulation ±1.0% Choose the load using the ratings of this complete model. The series name does not mean that every input version delivers 120 W. DC Input and Performance Specified DC input range 33.6–67.2 VDC Typical efficiency 92% Typical input current 2.8 A at 48 VDC Typical inrush current 5 A at 48 VDC Set-up / rise time 500 / 60 ms at 48 VDC Input undervoltage thresholds Power on ≥33.6 V; power off ≤33 V Supply-interruption classification EN 50155:2021, S1 Hold-up time Load-dependent; see the DDR-120C-48 curve on PDF page 19 Switching frequency 65 kHz, as shown in the block diagram Unless otherwise specified, catalogue measurements use 48 VDC input, rated load and 25°C ambient. Efficiency and input current are typical values, not guarantees at every operating point. Ripple and noise are measured with 20 MHz bandwidth and a 12-inch twisted pair terminated by 0.1 µF and 47 µF capacitors in parallel. Voltage tolerance includes set-up tolerance, line regulation and load regulation. During start-up, a current-limiting circuit suppresses inrush. A MOSFET bypass reduces losses after start-up. Short-Duration Peak Loads Catalogue peak current 3.75 A Catalogue peak power 180 W Maximum peak duration 3 seconds; subject to the peak-loading and derating curves Catalogue loading example 1 100% base load for 100 seconds, followed by 150% load for 3 seconds Catalogue loading example 2 40% base load for 10 seconds, followed by 150% load for 3 seconds The peak rating is for short load events, not continuous output. Follow the complete temperature, input-voltage and repetition conditions on PDF page 17. The two loading diagrams are specific examples; they do not establish a universal duty cycle for every application. Protection Short-circuit protection Included Overload protection After the short peak-load interval, constant-current limiting at 105–135% of rated output power; automatic recovery Overvoltage threshold 57.6–67.2 V Overvoltage recovery Output shuts down; reapply input power to recover Input reverse-polarity protection Internal series MOSFET in the negative input opens on reversed polarity; automatic recovery after the fault is removed Input undervoltage protection Output shuts down below the control threshold and restarts automatically when the input voltage recovers Limit planned peak operation to the 3-second maximum stated in the specification note. Do not use the overload-protection delay as a continuous-load rating. Cooling, Derating and Environment Cooling Fanless free-air convection; vertical mounting Working temperature −40 to +70°C, with derating Continuous thermal loading 100% through +55°C; 80% at +60°C; 40% at +70°C, following the linear derating curve Low-input loading 90% in the low-input region below 43.2 VDC; full rated load from 43.2 VDC within the specified range Working humidity 5–95% RH, non-condensing Storage temperature and humidity −40 to +85°C; 5–95% RH, non-condensing Temperature coefficient ±0.03%/°C from 0 to 55°C Operating altitude Up to 5000 m; reduce the allowed ambient temperature by 3.5°C per 1000 m above 2000 m Component vibration test 10–500 Hz, 5 G; 10 minutes per cycle, 60 minutes on each X, Y and Z axis Mounting vibration reference IEC 61373 Apply temperature and low-input derating together. The 70°C operating limit does not mean full continuous power is available at 70°C. Maintain the intended vertical orientation and an unobstructed convection path. Dimensions, Connections and Installation Parts Dimensions, W × H × D 32 × 125.2 × 102 mm Mechanical case 221; drawing tolerance ±1 mm Compatible DIN rails TS-35/7.5 or TS-35/15 Input terminal block TB1 Pin 1: FG; pin 2: DC input −Vin; pin 3: DC input +Vin Output terminal block TB2 Pins 1 and 2: DC output −Vo; pins 3 and 4: DC output +Vo Output adjustment Front-panel voltage adjustment; use the model-specific adjustment range Internal input fuse reference 1 × Conquer MST, 8 A / 250 V; time-lag type Use the terminal numbers on the mechanical drawing on PDF page 22 and observe input/output polarity and frame-ground connections. The two side holes marked “No Use” are not mounting points. TS-35/7.5 and TS-35/15 identify the supported mounting-rail profiles. The catalogue does not state that a rail is supplied. Conquer MST identifies the internal fuse component and rating, not an additional MEAN WELL accessory included with the converter. Isolation and Standards Input-to-output isolation 4 kVDC, reinforced isolation Input-to-FG withstand voltage 2.5 kVDC Output-to-FG withstand voltage 2.5 kVDC Insulation resistance Input–output, input–FG and output–FG: >100 MΩ at 500 VDC, 25°C and 70% RH Catalogue-listed safety approvals IEC 62368-1, UL 62368-1, EAC TP TC 004 and AS/NZS 62368.1 Safety design reference UL 508 EMC emission BS EN / EN 55032: Class B conducted and radiated emissions EMC immunity BS EN / EN 55035 and BS EN / EN 61000-6-2; listed tests use performance criterion A Railway references BS EN / EN 50155; IEC 60571; IEC 61373 shock and vibration; BS EN / EN 45545-2 fire protection Railway EMC reference BS EN / EN 50121-3-2 The final equipment must still be checked for compliance with applicable EMC requirements. PDF page 21 records material-specific EN 45545-2 fire tests and environmental tests; these results do not certify every completed system or installation. Mass and Catalogue References Mass, catalogue PACKING reference per unit 510 g Catalogue packing 510 g; 28 units / 15.3 kg / 1.23 CUFT Minimum MTBF 1769.5K hours, Telcordia SR-332; 214.5K hours, MIL-HDBK-217F at 25°C Catalogue warranty 3 years The stated mass is the single-unit reference in the catalogue PACKING field. It is not a measured shipment weight.

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  MEAN WELL DDR-120 series: DIN Rail DC/DC Converter - DDR-120C-24

  The MEAN WELL DDR-120C-24 is an isolated DIN rail DC/DC converter providing 24 V at up to 5 A (120 W). Its C-code input accepts 33.6–67.2 VDC. The 32 mm-wide, fanless metal enclosure mounts on TS-35/7.5 or TS-35/15 rail. Adjustable output, 4 kVDC reinforced input-to-output isolation and short-duration peak capability support industrial control, transport and communications equipment within the ratings below. Product Datasheet Download MEAN WELL DDR-120 Datasheet (PDF) The DDR-120 section is on PDF pages 14, 15, 16, 17, 18, 19, 20, 21, 22. Refer to the complete mechanical drawings and notes when planning installation. Model and Output Ratings Full model DDR-120C-24 Series DDR-120 Input code C: 48 VDC nominal test input Output code 24: 24 VDC nominal output DC output voltage 24 V Rated output current 5 A Rated output power 120 W Output current range 0–5 A Output voltage adjustment 24–28 V Maximum ripple and noise 50 mVp-p Voltage tolerance ±1.0% Line regulation ±0.5% Load regulation ±1.0% Choose the load using the ratings of this complete model. The series name does not mean that every input version delivers 120 W. DC Input and Performance Specified DC input range 33.6–67.2 VDC Typical efficiency 91% Typical input current 2.8 A at 48 VDC Typical inrush current 5 A at 48 VDC Set-up / rise time 500 / 60 ms at 48 VDC Input undervoltage thresholds Power on ≥33.6 V; power off ≤33 V Supply-interruption classification EN 50155:2021, S1 Hold-up time Load-dependent; see the DDR-120C-24 curve on PDF page 19 Switching frequency 65 kHz, as shown in the block diagram Unless otherwise specified, catalogue measurements use 48 VDC input, rated load and 25°C ambient. Efficiency and input current are typical values, not guarantees at every operating point. Ripple and noise are measured with 20 MHz bandwidth and a 12-inch twisted pair terminated by 0.1 µF and 47 µF capacitors in parallel. Voltage tolerance includes set-up tolerance, line regulation and load regulation. During start-up, a current-limiting circuit suppresses inrush. A MOSFET bypass reduces losses after start-up. Short-Duration Peak Loads Catalogue peak current 7.5 A Catalogue peak power 180 W Maximum peak duration 3 seconds; subject to the peak-loading and derating curves Catalogue loading example 1 100% base load for 100 seconds, followed by 150% load for 3 seconds Catalogue loading example 2 40% base load for 10 seconds, followed by 150% load for 3 seconds The peak rating is for short load events, not continuous output. Follow the complete temperature, input-voltage and repetition conditions on PDF page 17. The two loading diagrams are specific examples; they do not establish a universal duty cycle for every application. Protection Short-circuit protection Included Overload protection After the short peak-load interval, constant-current limiting at 105–135% of rated output power; automatic recovery Overvoltage threshold 28.8–33.6 V Overvoltage recovery Output shuts down; reapply input power to recover Input reverse-polarity protection Internal series MOSFET in the negative input opens on reversed polarity; automatic recovery after the fault is removed Input undervoltage protection Output shuts down below the control threshold and restarts automatically when the input voltage recovers Limit planned peak operation to the 3-second maximum stated in the specification note. Do not use the overload-protection delay as a continuous-load rating. Cooling, Derating and Environment Cooling Fanless free-air convection; vertical mounting Working temperature −40 to +70°C, with derating Continuous thermal loading 100% through +55°C; 80% at +60°C; 40% at +70°C, following the linear derating curve Low-input loading 90% in the low-input region below 43.2 VDC; full rated load from 43.2 VDC within the specified range Working humidity 5–95% RH, non-condensing Storage temperature and humidity −40 to +85°C; 5–95% RH, non-condensing Temperature coefficient ±0.03%/°C from 0 to 55°C Operating altitude Up to 5000 m; reduce the allowed ambient temperature by 3.5°C per 1000 m above 2000 m Component vibration test 10–500 Hz, 5 G; 10 minutes per cycle, 60 minutes on each X, Y and Z axis Mounting vibration reference IEC 61373 Apply temperature and low-input derating together. The 70°C operating limit does not mean full continuous power is available at 70°C. Maintain the intended vertical orientation and an unobstructed convection path. Dimensions, Connections and Installation Parts Dimensions, W × H × D 32 × 125.2 × 102 mm Mechanical case 221; drawing tolerance ±1 mm Compatible DIN rails TS-35/7.5 or TS-35/15 Input terminal block TB1 Pin 1: FG; pin 2: DC input −Vin; pin 3: DC input +Vin Output terminal block TB2 Pins 1 and 2: DC output −Vo; pins 3 and 4: DC output +Vo Output adjustment Front-panel voltage adjustment; use the model-specific adjustment range Internal input fuse reference 1 × Conquer MST, 8 A / 250 V; time-lag type Use the terminal numbers on the mechanical drawing on PDF page 22 and observe input/output polarity and frame-ground connections. The two side holes marked “No Use” are not mounting points. TS-35/7.5 and TS-35/15 identify the supported mounting-rail profiles. The catalogue does not state that a rail is supplied. Conquer MST identifies the internal fuse component and rating, not an additional MEAN WELL accessory included with the converter. Isolation and Standards Input-to-output isolation 4 kVDC, reinforced isolation Input-to-FG withstand voltage 2.5 kVDC Output-to-FG withstand voltage 2.5 kVDC Insulation resistance Input–output, input–FG and output–FG: >100 MΩ at 500 VDC, 25°C and 70% RH Catalogue-listed safety approvals IEC 62368-1, UL 62368-1, EAC TP TC 004 and AS/NZS 62368.1 Safety design reference UL 508 EMC emission BS EN / EN 55032: Class B conducted and radiated emissions EMC immunity BS EN / EN 55035 and BS EN / EN 61000-6-2; listed tests use performance criterion A Railway references BS EN / EN 50155; IEC 60571; IEC 61373 shock and vibration; BS EN / EN 45545-2 fire protection Railway EMC reference BS EN / EN 50121-3-2 The final equipment must still be checked for compliance with applicable EMC requirements. PDF page 21 records material-specific EN 45545-2 fire tests and environmental tests; these results do not certify every completed system or installation. Mass and Catalogue References Mass, catalogue PACKING reference per unit 510 g Catalogue packing 510 g; 28 units / 15.3 kg / 1.23 CUFT Minimum MTBF 1769.5K hours, Telcordia SR-332; 214.5K hours, MIL-HDBK-217F at 25°C Catalogue warranty 3 years The stated mass is the single-unit reference in the catalogue PACKING field. It is not a measured shipment weight.

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  MEAN WELL DDR-120 series: DIN Rail DC/DC Converter - DDR-120C-12

  The MEAN WELL DDR-120C-12 is an isolated DIN rail DC/DC converter providing 12 V at up to 10 A (120 W). Its C-code input accepts 33.6–67.2 VDC. The 32 mm-wide, fanless metal enclosure mounts on TS-35/7.5 or TS-35/15 rail. Adjustable output, 4 kVDC reinforced input-to-output isolation and short-duration peak capability support industrial control, transport and communications equipment within the ratings below. Product Datasheet Download MEAN WELL DDR-120 Datasheet (PDF) The DDR-120 section is on PDF pages 14, 15, 16, 17, 18, 19, 20, 21, 22. Refer to the complete mechanical drawings and notes when planning installation. Model and Output Ratings Full model DDR-120C-12 Series DDR-120 Input code C: 48 VDC nominal test input Output code 12: 12 VDC nominal output DC output voltage 12 V Rated output current 10 A Rated output power 120 W Output current range 0–10 A Output voltage adjustment 9–14 V Maximum ripple and noise 50 mVp-p Voltage tolerance ±1.0% Line regulation ±0.5% Load regulation ±1.0% Choose the load using the ratings of this complete model. The series name does not mean that every input version delivers 120 W. DC Input and Performance Specified DC input range 33.6–67.2 VDC Typical efficiency 89.5% Typical input current 2.8 A at 48 VDC Typical inrush current 5 A at 48 VDC Set-up / rise time 500 / 60 ms at 48 VDC Input undervoltage thresholds Power on ≥33.6 V; power off ≤33 V Supply-interruption classification EN 50155:2021, S1 Hold-up time Load-dependent; see the DDR-120C-12 curve on PDF page 19 Switching frequency 65 kHz, as shown in the block diagram Unless otherwise specified, catalogue measurements use 48 VDC input, rated load and 25°C ambient. Efficiency and input current are typical values, not guarantees at every operating point. Ripple and noise are measured with 20 MHz bandwidth and a 12-inch twisted pair terminated by 0.1 µF and 47 µF capacitors in parallel. Voltage tolerance includes set-up tolerance, line regulation and load regulation. During start-up, a current-limiting circuit suppresses inrush. A MOSFET bypass reduces losses after start-up. Short-Duration Peak Loads Catalogue peak current 15 A Catalogue peak power 180 W Maximum peak duration 3 seconds; subject to the peak-loading and derating curves Catalogue loading example 1 100% base load for 100 seconds, followed by 150% load for 3 seconds Catalogue loading example 2 40% base load for 10 seconds, followed by 150% load for 3 seconds The peak rating is for short load events, not continuous output. Follow the complete temperature, input-voltage and repetition conditions on PDF page 17. The two loading diagrams are specific examples; they do not establish a universal duty cycle for every application. Protection Short-circuit protection Included Overload protection After the short peak-load interval, constant-current limiting at 105–135% of rated output power; automatic recovery Overvoltage threshold 14.4–16.8 V Overvoltage recovery Output shuts down; reapply input power to recover Input reverse-polarity protection Internal series MOSFET in the negative input opens on reversed polarity; automatic recovery after the fault is removed Input undervoltage protection Output shuts down below the control threshold and restarts automatically when the input voltage recovers Limit planned peak operation to the 3-second maximum stated in the specification note. Do not use the overload-protection delay as a continuous-load rating. Cooling, Derating and Environment Cooling Fanless free-air convection; vertical mounting Working temperature −40 to +70°C, with derating Continuous thermal loading 100% through +55°C; 80% at +60°C; 40% at +70°C, following the linear derating curve Low-input loading 90% in the low-input region below 43.2 VDC; full rated load from 43.2 VDC within the specified range Working humidity 5–95% RH, non-condensing Storage temperature and humidity −40 to +85°C; 5–95% RH, non-condensing Temperature coefficient ±0.03%/°C from 0 to 55°C Operating altitude Up to 5000 m; reduce the allowed ambient temperature by 3.5°C per 1000 m above 2000 m Component vibration test 10–500 Hz, 5 G; 10 minutes per cycle, 60 minutes on each X, Y and Z axis Mounting vibration reference IEC 61373 Apply temperature and low-input derating together. The 70°C operating limit does not mean full continuous power is available at 70°C. Maintain the intended vertical orientation and an unobstructed convection path. Dimensions, Connections and Installation Parts Dimensions, W × H × D 32 × 125.2 × 102 mm Mechanical case 221; drawing tolerance ±1 mm Compatible DIN rails TS-35/7.5 or TS-35/15 Input terminal block TB1 Pin 1: FG; pin 2: DC input −Vin; pin 3: DC input +Vin Output terminal block TB2 Pins 1 and 2: DC output −Vo; pins 3 and 4: DC output +Vo Output adjustment Front-panel voltage adjustment; use the model-specific adjustment range Internal input fuse reference 1 × Conquer MST, 8 A / 250 V; time-lag type Use the terminal numbers on the mechanical drawing on PDF page 22 and observe input/output polarity and frame-ground connections. The two side holes marked “No Use” are not mounting points. TS-35/7.5 and TS-35/15 identify the supported mounting-rail profiles. The catalogue does not state that a rail is supplied. Conquer MST identifies the internal fuse component and rating, not an additional MEAN WELL accessory included with the converter. Isolation and Standards Input-to-output isolation 4 kVDC, reinforced isolation Input-to-FG withstand voltage 2.5 kVDC Output-to-FG withstand voltage 2.5 kVDC Insulation resistance Input–output, input–FG and output–FG: >100 MΩ at 500 VDC, 25°C and 70% RH Catalogue-listed safety approvals IEC 62368-1, UL 62368-1, EAC TP TC 004 and AS/NZS 62368.1 Safety design reference UL 508 EMC emission BS EN / EN 55032: Class B conducted and radiated emissions EMC immunity BS EN / EN 55035 and BS EN / EN 61000-6-2; listed tests use performance criterion A Railway references BS EN / EN 50155; IEC 60571; IEC 61373 shock and vibration; BS EN / EN 45545-2 fire protection Railway EMC reference BS EN / EN 50121-3-2 The final equipment must still be checked for compliance with applicable EMC requirements. PDF page 21 records material-specific EN 45545-2 fire tests and environmental tests; these results do not certify every completed system or installation. Mass and Catalogue References Mass, catalogue PACKING reference per unit 510 g Catalogue packing 510 g; 28 units / 15.3 kg / 1.23 CUFT Minimum MTBF 1769.5K hours, Telcordia SR-332; 214.5K hours, MIL-HDBK-217F at 25°C Catalogue warranty 3 years The stated mass is the single-unit reference in the catalogue PACKING field. It is not a measured shipment weight.

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  MEAN WELL DDR-120 series: DIN Rail DC/DC Converter - DDR-120B-48

  The MEAN WELL DDR-120B-48 is an isolated DIN rail DC/DC converter providing 48 V at up to 2.5 A (120 W). Its B-code input accepts 16.8–33.6 VDC. The 32 mm-wide, fanless metal enclosure mounts on TS-35/7.5 or TS-35/15 rail. Adjustable output, 4 kVDC reinforced input-to-output isolation and short-duration peak capability support industrial control, transport and communications equipment within the ratings below. Product Datasheet Download MEAN WELL DDR-120 Datasheet (PDF) The DDR-120 section is on PDF pages 14, 15, 16, 17, 18, 19, 20, 21, 22. Refer to the complete mechanical drawings and notes when planning installation. Model and Output Ratings Full model DDR-120B-48 Series DDR-120 Input code B: 24 VDC nominal test input Output code 48: 48 VDC nominal output DC output voltage 48 V Rated output current 2.5 A Rated output power 120 W Output current range 0–2.5 A Output voltage adjustment 48–56 V Maximum ripple and noise 50 mVp-p Voltage tolerance ±1.0% Line regulation ±0.5% Load regulation ±1.0% Choose the load using the ratings of this complete model. The series name does not mean that every input version delivers 120 W. DC Input and Performance Specified DC input range 16.8–33.6 VDC Typical efficiency 91% Typical input current 5.6 A at 24 VDC Typical inrush current 5 A at 24 VDC Set-up / rise time 500 / 60 ms at 24 VDC Input undervoltage thresholds Power on ≥16.8 V; power off ≤16.5 V Supply-interruption classification EN 50155:2021, S1 Hold-up time Load-dependent; see the DDR-120B-48 curve on PDF page 19 Switching frequency 65 kHz, as shown in the block diagram Unless otherwise specified, catalogue measurements use 24 VDC input, rated load and 25°C ambient. Efficiency and input current are typical values, not guarantees at every operating point. Ripple and noise are measured with 20 MHz bandwidth and a 12-inch twisted pair terminated by 0.1 µF and 47 µF capacitors in parallel. Voltage tolerance includes set-up tolerance, line regulation and load regulation. During start-up, a current-limiting circuit suppresses inrush. A MOSFET bypass reduces losses after start-up. Short-Duration Peak Loads Catalogue peak current 3.75 A Catalogue peak power 180 W Maximum peak duration 3 seconds; subject to the peak-loading and derating curves Catalogue loading example 1 100% base load for 100 seconds, followed by 150% load for 3 seconds Catalogue loading example 2 40% base load for 10 seconds, followed by 150% load for 3 seconds The peak rating is for short load events, not continuous output. Follow the complete temperature, input-voltage and repetition conditions on PDF page 17. The two loading diagrams are specific examples; they do not establish a universal duty cycle for every application. Protection Short-circuit protection Included Overload protection After the short peak-load interval, constant-current limiting at 105–135% of rated output power; automatic recovery Overvoltage threshold 57.6–67.2 V Overvoltage recovery Output shuts down; reapply input power to recover Input reverse-polarity protection Internal series MOSFET in the negative input opens on reversed polarity; automatic recovery after the fault is removed Input undervoltage protection Output shuts down below the control threshold and restarts automatically when the input voltage recovers Limit planned peak operation to the 3-second maximum stated in the specification note. Do not use the overload-protection delay as a continuous-load rating. Cooling, Derating and Environment Cooling Fanless free-air convection; vertical mounting Working temperature −40 to +70°C, with derating Continuous thermal loading 100% through +55°C; 80% at +60°C; 40% at +70°C, following the linear derating curve Low-input loading 90% in the low-input region below 21.6 VDC; full rated load from 21.6 VDC within the specified range Working humidity 5–95% RH, non-condensing Storage temperature and humidity −40 to +85°C; 5–95% RH, non-condensing Temperature coefficient ±0.03%/°C from 0 to 55°C Operating altitude Up to 5000 m; reduce the allowed ambient temperature by 3.5°C per 1000 m above 2000 m Component vibration test 10–500 Hz, 5 G; 10 minutes per cycle, 60 minutes on each X, Y and Z axis Mounting vibration reference IEC 61373 Apply temperature and low-input derating together. The 70°C operating limit does not mean full continuous power is available at 70°C. Maintain the intended vertical orientation and an unobstructed convection path. Dimensions, Connections and Installation Parts Dimensions, W × H × D 32 × 125.2 × 102 mm Mechanical case 221; drawing tolerance ±1 mm Compatible DIN rails TS-35/7.5 or TS-35/15 Input terminal block TB1 Pin 1: FG; pin 2: DC input −Vin; pin 3: DC input +Vin Output terminal block TB2 Pins 1 and 2: DC output −Vo; pins 3 and 4: DC output +Vo Output adjustment Front-panel voltage adjustment; use the model-specific adjustment range Internal input fuse reference 2 × Conquer MST, 8 A / 250 V each; time-lag type Use the terminal numbers on the mechanical drawing on PDF page 22 and observe input/output polarity and frame-ground connections. The two side holes marked “No Use” are not mounting points. TS-35/7.5 and TS-35/15 identify the supported mounting-rail profiles. The catalogue does not state that a rail is supplied. Conquer MST identifies the internal fuse component and rating, not an additional MEAN WELL accessory included with the converter. Isolation and Standards Input-to-output isolation 4 kVDC, reinforced isolation Input-to-FG withstand voltage 2.5 kVDC Output-to-FG withstand voltage 2.5 kVDC Insulation resistance Input–output, input–FG and output–FG: >100 MΩ at 500 VDC, 25°C and 70% RH Catalogue-listed safety approvals IEC 62368-1, UL 62368-1, EAC TP TC 004 and AS/NZS 62368.1 Safety design reference UL 508 EMC emission BS EN / EN 55032: Class B conducted and radiated emissions EMC immunity BS EN / EN 55035 and BS EN / EN 61000-6-2; listed tests use performance criterion A Railway references BS EN / EN 50155; IEC 60571; IEC 61373 shock and vibration; BS EN / EN 45545-2 fire protection Railway EMC reference BS EN / EN 50121-3-2 The final equipment must still be checked for compliance with applicable EMC requirements. PDF page 21 records material-specific EN 45545-2 fire tests and environmental tests; these results do not certify every completed system or installation. Mass and Catalogue References Mass, catalogue PACKING reference per unit 510 g Catalogue packing 510 g; 28 units / 15.3 kg / 1.23 CUFT Minimum MTBF 1769.5K hours, Telcordia SR-332; 214.5K hours, MIL-HDBK-217F at 25°C Catalogue warranty 3 years The stated mass is the single-unit reference in the catalogue PACKING field. It is not a measured shipment weight.

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