MEAN WELL NDR-75 series: Slim Industrial DIN Rail Power Supply - NDR-75-24

Description

MEAN WELL NDR-75-24 is a slim, metal-enclosed industrial DIN rail power supply rated at 24 V DC, 3.2 A and 76.8 W. Its 32 mm-wide housing supports compact control cabinets. It uses free-air convection and constant-current overload protection; observe the model-specific input and temperature derating conditions below.

Product Datasheet

Download MEAN WELL NDR-75 Datasheet (PDF)

The NDR-75 section is on PDF pages 1, 2, 3, 4. Refer to the complete mechanical drawings and notes when planning installation.

Model Identification

Complete model NDR-75-24
Series / voltage code NDR-75 is the slim industrial DIN rail family; the final 24 code denotes 24 V nominal DC output. Use the actual rated power below rather than the family number as an output guarantee.
Construction / intended use Metal enclosure with free-air convection, adjustable DC output and constant-current overload limiting. The catalogue lists industrial control, semiconductor fabrication, factory automation and electro-mechanical applications.

DC Output

Nominal output 24 V DC; 3.2 A rated, current range 0–3.2 A; 76.8 W rated power.
Output-voltage adjustment 24–28 V DC using +V ADJ. Stay within the permitted output current and power when adjusting.
Ripple and noise, maximum 120 mVp-p.
Voltage tolerance ±1.0%, including setup tolerance, line regulation and load regulation.
Line / load regulation ±0.5% / ±1.0%.
Efficiency, typical 88% under the stated default catalogue conditions.

Ripple and noise are measured at 20 MHz bandwidth using a 12-inch twisted pair terminated with 0.1 µF and 47 µF parallel capacitors.

Input and Starting

AC input / frequency 90–264 VAC, full range; 47–63 Hz. Apply the low-input derating curve.
DC input and polarity 127–370 VDC. Connect positive DC input to AC/L (+) and negative DC input to AC/N (-); maintain the FG protective-earth connection.
AC current, typical 1.45 A at 115 VAC; 0.9 A at 230 VAC.
Inrush current, typical 20 A at 115 VAC; 35 A at 230 VAC.
Setup / rise time 1200 / 60 ms at 230 VAC; 2000 / 60 ms at 115 VAC, at full load.
Hold-up time, typical 60 ms at 230 VAC; 12 ms at 115 VAC, at full load.
Leakage current Less than 1 mA at 240 VAC.

Protection and Status Indication

Short circuit / overload 105–130% of rated output power. Constant-current limiting; automatic recovery after the fault condition is removed. This is a protection threshold, not an additional continuous or timed-peak output rating.
Overvoltage 29–33 V; output shutdown, re-power to recover.
Overtemperature Output shutdown, re-power to recover. No numerical trip temperature is specified in this model’s table.
Status / adjustment The front drawing identifies a DC OK LED and +V ADJ. The LED is an indicator, not a separately specified DC OK relay contact.

Cooling, Derating and Environment

Operating range / orientation Free-air convection; -20 to +70°C with vertical mounting, subject to all derating curves. The temperature range does not mean full output is available throughout.
Low-temperature curve At 115 VAC, allowable load rises from 80% at -20°C to 100% at -10°C. The 230 VAC curve allows 100% in this low-temperature interval.
High-temperature curve For this output-voltage model, the vertical curve remains at 100% through 50°C, then declines to 50% at 70°C. The separate low-temperature input-voltage condition also applies.
Input-voltage curve, 60 Hz 90% load at 90 VAC, rising to 100% at 100 VAC; the 100% plateau continues through 264 VAC.
Working humidity / storage Working: 20–95% RH, non-condensing. Storage: -40 to +85°C, 10–95% RH.
Temperature coefficient ±0.03%/°C over 0–50°C.
Vibration Component: 10–500 Hz, 2 G, 10 minutes per cycle and 60 minutes along each X, Y and Z axis. Mounting complies with IEC60068-2-6.
High-altitude derating For this fanless supply, reduce the allowable ambient temperature by 3.5°C per additional 1000 m above 2000 m (6500 ft). This note does not specify a maximum operating altitude.

Apply input-voltage and temperature limits together. The published overload range is not a substitute for these operating limits.

Dimensions, Terminals and Installation

Dimensions / case 32 × 125.2 × 102 mm (W × H × D); case 221A, mechanical drawing tolerance ±1 mm.
Compatible DIN rail TS-35/7.5 or TS-35/15; the drawing shows a 35 mm rail profile. The rail is for reference and is not included with the unit.
Input terminal block TB1 Pin 1: FG protective earth; pin 2: AC/N or DC negative; pin 3: AC/L or DC positive.
Output terminal block TB2 Pins 1–2: DC output -V; pins 3–4: DC output +V.
Installation clearances For permanent full-power loading, the catalogue recommends 40 mm above, 20 mm below and 5 mm on each side. Where an adjacent device is a heat source, allow 15 mm clearance.
Installation details Use the complete mechanical drawing, the supplied unit’s markings and the manufacturer’s installation instructions for the rail attachment and wiring.

These model pages do not provide a separate mounting-kit, terminal-kit or connector ordering code. Do not infer that a rail or additional wiring accessory is supplied.

Safety, Insulation and EMC

Catalogue-listed safety UL508 and TUV BS EN/EN62368-1; EAC TP TC004 approved. The table states compliance with BS EN/EN60204-1.
Withstand voltage Input–output: 3 kVAC; input–FG: 2 kVAC; output–FG: 0.5 kVAC.
Insulation resistance More than 100 MΩ for input–output, input–FG and output–FG at 500 VDC, 25°C and 70% RH.
EMC emissions BS EN/EN55032 (CISPR32), BS EN/EN61204-3 Class B, BS EN/EN61000-3-2 and -3; EAC TP TC020.
EMC immunity BS EN/EN61000-4-2, -3, -4, -5, -6, -8 and -11; BS EN/EN55035; BS EN/EN61000-6-2 (BS EN/EN50082-2); BS EN/EN61204-3, heavy-industry level; EAC TP TC020.

The supply is a component to be installed in final equipment. Reconfirm that the completed equipment meets the applicable EMC directives.

Weight, Reliability and Reference Conditions

Catalogue unit weight 510 g, converted from the explicit 0.51 kg PACKING reference per unit; not a measured net weight, shipping weight or carton-weight average.
MTBF 2757.3 K hours minimum, Telcordia SR-332 (Bellcore); 486.2 K hours minimum, MIL-HDBK-217F at 25°C. These are reliability references, not guaranteed operating life.
Manufacturer test / warranty statement The catalogue lists a 100% full-load burn-in test and three-year warranty. Applicable manufacturer terms govern warranty coverage.
Default test conditions Unless otherwise specified: 230 VAC input, rated load and 25°C ambient.
Applicable datasheet NDR-75-SPEC, 2025-06-09; combined NDR/EDR catalogue pages 1–4.

MEAN WELL NDR-75 series: Slim Industrial DIN Rail Power Supply - NDR-75-24

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MEAN WELL NDR-75-24 is a slim, metal-enclosed industrial DIN rail power supply rated at 24 V DC, 3.2 A and... Read more

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    Description

    MEAN WELL NDR-75-24 is a slim, metal-enclosed industrial DIN rail power supply rated at 24 V DC, 3.2 A and 76.8 W. Its 32 mm-wide housing supports compact control cabinets. It uses free-air convection and constant-current overload protection; observe the model-specific input and temperature derating conditions below.

    Product Datasheet

    Download MEAN WELL NDR-75 Datasheet (PDF)

    The NDR-75 section is on PDF pages 1, 2, 3, 4. Refer to the complete mechanical drawings and notes when planning installation.

    Model Identification

    Complete model NDR-75-24
    Series / voltage code NDR-75 is the slim industrial DIN rail family; the final 24 code denotes 24 V nominal DC output. Use the actual rated power below rather than the family number as an output guarantee.
    Construction / intended use Metal enclosure with free-air convection, adjustable DC output and constant-current overload limiting. The catalogue lists industrial control, semiconductor fabrication, factory automation and electro-mechanical applications.

    DC Output

    Nominal output 24 V DC; 3.2 A rated, current range 0–3.2 A; 76.8 W rated power.
    Output-voltage adjustment 24–28 V DC using +V ADJ. Stay within the permitted output current and power when adjusting.
    Ripple and noise, maximum 120 mVp-p.
    Voltage tolerance ±1.0%, including setup tolerance, line regulation and load regulation.
    Line / load regulation ±0.5% / ±1.0%.
    Efficiency, typical 88% under the stated default catalogue conditions.

    Ripple and noise are measured at 20 MHz bandwidth using a 12-inch twisted pair terminated with 0.1 µF and 47 µF parallel capacitors.

    Input and Starting

    AC input / frequency 90–264 VAC, full range; 47–63 Hz. Apply the low-input derating curve.
    DC input and polarity 127–370 VDC. Connect positive DC input to AC/L (+) and negative DC input to AC/N (-); maintain the FG protective-earth connection.
    AC current, typical 1.45 A at 115 VAC; 0.9 A at 230 VAC.
    Inrush current, typical 20 A at 115 VAC; 35 A at 230 VAC.
    Setup / rise time 1200 / 60 ms at 230 VAC; 2000 / 60 ms at 115 VAC, at full load.
    Hold-up time, typical 60 ms at 230 VAC; 12 ms at 115 VAC, at full load.
    Leakage current Less than 1 mA at 240 VAC.

    Protection and Status Indication

    Short circuit / overload 105–130% of rated output power. Constant-current limiting; automatic recovery after the fault condition is removed. This is a protection threshold, not an additional continuous or timed-peak output rating.
    Overvoltage 29–33 V; output shutdown, re-power to recover.
    Overtemperature Output shutdown, re-power to recover. No numerical trip temperature is specified in this model’s table.
    Status / adjustment The front drawing identifies a DC OK LED and +V ADJ. The LED is an indicator, not a separately specified DC OK relay contact.

    Cooling, Derating and Environment

    Operating range / orientation Free-air convection; -20 to +70°C with vertical mounting, subject to all derating curves. The temperature range does not mean full output is available throughout.
    Low-temperature curve At 115 VAC, allowable load rises from 80% at -20°C to 100% at -10°C. The 230 VAC curve allows 100% in this low-temperature interval.
    High-temperature curve For this output-voltage model, the vertical curve remains at 100% through 50°C, then declines to 50% at 70°C. The separate low-temperature input-voltage condition also applies.
    Input-voltage curve, 60 Hz 90% load at 90 VAC, rising to 100% at 100 VAC; the 100% plateau continues through 264 VAC.
    Working humidity / storage Working: 20–95% RH, non-condensing. Storage: -40 to +85°C, 10–95% RH.
    Temperature coefficient ±0.03%/°C over 0–50°C.
    Vibration Component: 10–500 Hz, 2 G, 10 minutes per cycle and 60 minutes along each X, Y and Z axis. Mounting complies with IEC60068-2-6.
    High-altitude derating For this fanless supply, reduce the allowable ambient temperature by 3.5°C per additional 1000 m above 2000 m (6500 ft). This note does not specify a maximum operating altitude.

    Apply input-voltage and temperature limits together. The published overload range is not a substitute for these operating limits.

    Dimensions, Terminals and Installation

    Dimensions / case 32 × 125.2 × 102 mm (W × H × D); case 221A, mechanical drawing tolerance ±1 mm.
    Compatible DIN rail TS-35/7.5 or TS-35/15; the drawing shows a 35 mm rail profile. The rail is for reference and is not included with the unit.
    Input terminal block TB1 Pin 1: FG protective earth; pin 2: AC/N or DC negative; pin 3: AC/L or DC positive.
    Output terminal block TB2 Pins 1–2: DC output -V; pins 3–4: DC output +V.
    Installation clearances For permanent full-power loading, the catalogue recommends 40 mm above, 20 mm below and 5 mm on each side. Where an adjacent device is a heat source, allow 15 mm clearance.
    Installation details Use the complete mechanical drawing, the supplied unit’s markings and the manufacturer’s installation instructions for the rail attachment and wiring.

    These model pages do not provide a separate mounting-kit, terminal-kit or connector ordering code. Do not infer that a rail or additional wiring accessory is supplied.

    Safety, Insulation and EMC

    Catalogue-listed safety UL508 and TUV BS EN/EN62368-1; EAC TP TC004 approved. The table states compliance with BS EN/EN60204-1.
    Withstand voltage Input–output: 3 kVAC; input–FG: 2 kVAC; output–FG: 0.5 kVAC.
    Insulation resistance More than 100 MΩ for input–output, input–FG and output–FG at 500 VDC, 25°C and 70% RH.
    EMC emissions BS EN/EN55032 (CISPR32), BS EN/EN61204-3 Class B, BS EN/EN61000-3-2 and -3; EAC TP TC020.
    EMC immunity BS EN/EN61000-4-2, -3, -4, -5, -6, -8 and -11; BS EN/EN55035; BS EN/EN61000-6-2 (BS EN/EN50082-2); BS EN/EN61204-3, heavy-industry level; EAC TP TC020.

    The supply is a component to be installed in final equipment. Reconfirm that the completed equipment meets the applicable EMC directives.

    Weight, Reliability and Reference Conditions

    Catalogue unit weight 510 g, converted from the explicit 0.51 kg PACKING reference per unit; not a measured net weight, shipping weight or carton-weight average.
    MTBF 2757.3 K hours minimum, Telcordia SR-332 (Bellcore); 486.2 K hours minimum, MIL-HDBK-217F at 25°C. These are reliability references, not guaranteed operating life.
    Manufacturer test / warranty statement The catalogue lists a 100% full-load burn-in test and three-year warranty. Applicable manufacturer terms govern warranty coverage.
    Default test conditions Unless otherwise specified: 230 VAC input, rated load and 25°C ambient.
    Applicable datasheet NDR-75-SPEC, 2025-06-09; combined NDR/EDR catalogue pages 1–4.

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