MEAN WELL DUPS40 is a DIN rail DC-UPS controller for 24 V systems, with 24–29 V DC input, 0–40 A battery discharge and 2 A charging. Paired with an external DC power supply and 24 V lead-acid battery, it provides battery backup for the DC load, with bus-status, battery-fail and discharge monitoring. Product Datasheet Download MEAN WELL DUPS Datasheet (PDF) The DUPS section is on PDF pages 20, 21, 22, 23, 24. Refer to the complete mechanical drawings and notes when planning installation. Model and System Function Complete model DUPS40 Model code DUPS identifies the DIN rail DC-UPS module; 40 identifies its 40 A output-current class. Intended system 24 V DC system with an external DC power supply, this UPS controller, an external lead-acid battery and the load. Maximum rated discharge current is 40 A, subject to derating. Applications Industrial control, semiconductor fabrication equipment, factory automation, electromechanical equipment, security, emergency lighting and communications backup. The module connects in parallel with the DC bus and charges the battery during normal operation. When the upstream supply is interrupted, the battery supports the load through the module. Backup duration depends on the battery and load. This is a DC controller requiring an external battery and power supply, not an AC-input UPS or a self-contained capacitor buffer. DC Bus and Battery Ratings Normal DC input 24 V DC nominal; operating input range 24–29 V DC. Rated DC input current 40 A. DC-UPS output-voltage range 21–29 V DC. Confirm that the load accepts this voltage range during backup. Battery-discharge current 0–40 A. Battery-charging current 2 A. Battery chemistry and arrangement 24 V lead-acid battery pack: two 12 V batteries connected in series, or one 24 V battery. External battery capacity 4–135 Ah. Select a compatible battery with suitable discharge capability for the load. Select the external power supply for the DC bus, load and battery-charging demand. The catalogue does not state a separate regulated wattage rating, a numeric transfer-delay guarantee or a complete charging-voltage profile. Battery capacity alone does not guarantee the tabulated backup duration. Battery Protection Reverse battery polarity Internal detection protects against damage; recovery is automatic after the fault is removed. Short-circuit limitation The stated no-damage short-circuit protection works only when batteries are not connected. An external fuse is recommended when a battery is connected. Over-discharge current At 42–46 A, the unit cuts off battery discharge by relay after 3 seconds. This protection threshold is not a continuous-current rating. Deep-discharge protection The battery-discharge path is cut off by relay. No numeric deep-discharge cutoff voltage is specified in these pages. The battery-fail warning threshold below is a monitoring threshold, not a specified deep-discharge cutoff voltage. Select the external fuse for the complete battery circuit according to the installation requirements; the catalogue does not provide an external fuse order code or rating. Internal block-diagram markings must not be used as external fuse-selection instructions. Status Relays and LEDs Contact rating, maximum 30 V DC / 1 A, resistive load. DC BUS OK contact Closed when DC-bus voltage is between 21 and 29 V, with ±2% threshold tolerance. DC BUS OK green LED Lit when the DC bus is OK; dark when the DC bus fails. Battery Fail contact Closed when battery voltage falls below 22 V (±2%) or the battery-test function detects a failure. Battery Fail red LED Lit for an over-discharge warning or a faulty battery; dark when the battery is OK. Automatic battery check The unit tests the battery every 30 seconds. A failed test activates the Battery Fail relay contact and red LED. Battery Discharge contact Closed while the battery is in the discharge condition. Battery Discharge yellow LED Lit when the battery is discharging; dark when it is not discharging or when discharge current is below 2.0 A. A dark yellow LED therefore does not by itself prove zero battery current. The relay contact states and LED indications have separate specified conditions. In particular, do not apply the low-current yellow-LED threshold as an unstated relay switching threshold. Reference Backup Times 2.5 A discharge 6500 s with 7.5 Ah; 14500 s with 12 Ah; 19000 s with 15 Ah. 5 A discharge 3000 s with 7.5 Ah; 7000 s with 12 Ah; 9000 s with 15 Ah. 10 A discharge 1200 s with 7.5 Ah; 2400 s with 12 Ah; 3200 s with 15 Ah. 20 A discharge 400 s with 7.5 Ah; 1100 s with 12 Ah; 1500 s with 15 Ah. 30 A discharge 120 s with 7.5 Ah; 450 s with 12 Ah; 600 s with 15 Ah. 40 A discharge 25 s with 7.5 Ah; 200 s with 12 Ah; 280 s with 15 Ah. These are the catalogue’s reference buffering times for external battery capacities of 7.5, 12 and 15 Ah on PDF page 22. They are not guaranteed runtime values for every battery, temperature, state of charge or age. Keep discharge current within the 40 A rating and the applicable temperature derating. System Wiring and Compatible Modules Basic backup connection The page 24 AC-interruption example connects an external 24 V battery to BAT+ and BAT−, and the external power supply and load in parallel with DC+ and DC−. The illustrated power supply is labelled 24 V / 40 A maximum. Redundancy-module choices DRDN20-24 or DRDN40-24: the 24 V versions of the redundancy modules named in the application diagram. Both accept 19–29 V DC; DRDN20-24 has a 20 A total continuous-output limit and DRDN40-24 has a 40 A limit. The continuous DC power-supply path through DRDN20-24 is limited to 20 A; use DRDN40-24 where that redundant supply path must carry up to 40 A. DUPS40 does not increase either redundancy module’s current rating. The illustrated system uses one redundancy module with two external power supplies. System arrangement The second diagram on page 24 combines the battery-backed DC bus with two power supplies and a redundancy module to address AC interruption or a power-supply failure. Follow the complete positive and negative wiring paths shown. Separate system components The external power supplies, battery, redundancy module and protective fuse must be selected for the application. These diagrams do not identify a complete bundled kit or a battery order code. The named redundancy modules are system-level choices, not direct replacements for the UPS controller. Match voltage, current, wiring and redundancy requirements before connection. The catalogue gives no additional complete connector or battery-accessory order code for this module. Cooling, Derating and Environment Cooling and operating temperature Free-air convection; −30 to +70°C, subject to the derating curve. Temperature derating The catalogue curve marked HORIZONTAL permits 100% load from −30°C through +60°C, falling to 75% at +70°C. Follow the plotted segment and the installation instructions. Working humidity 5–95% RH, non-condensing. Storage temperature −40 to +85°C. Temperature coefficient ±0.03%/°C over 0–60°C. Vibration Component: 10–500 Hz, 2 G, 10 minutes per cycle and 60 minutes on each X, Y and Z axis. Mounting compliance: IEC60068-2-6. Operating altitude / category 2000 m; overvoltage category II. The generic catalogue note specifies a fanless ambient-temperature reduction of 3.5°C per 1000 m above 2000 m; it does not establish a higher approved operating-altitude limit for this module. Keep operation within the stated 2000 m rating. Do not treat +70°C as an unconditional full-current operating point. Dimensions, Terminals and DIN Rail Dimensions, W × H × D 63 × 125.2 × 113.5 mm; drawing tolerance ±1 mm; case 979F. TB1: battery connections Pin 1: BAT INPUT +; pin 2: BAT INPUT −. TB1: DC-bus connections Pin 3: DC INPUT −; pin 4: DC INPUT +. TB2: Battery Discharge Pins 1 and 2: Battery Discharge relay contact; yellow LED. TB2: Battery Fail Pins 3 and 4: Battery Fail relay contact; red LED. TB2: DC OK Pins 5 and 6: DC OK relay contact; green LED. DIN rail Fits 35 mm DIN rail TS35/7.5 or TS35/15. The illustrated rail is for reference and is not included. Use the numbered front-view terminal assignment on PDF page 23. Observe battery and DC-bus polarity. These pages do not specify terminal tightening torque, wire gauge or numeric ventilation clearances; follow the installation manual for those details. Safety, Insulation and EMC Catalogue-listed safety approvals EAC TP TC004 approved. Withstand voltage 0.5 kVAC for input/output to chassis, input/output to relay, and relay to chassis. These test pairs do not state galvanic isolation between DC input and output. Insulation resistance Greater than 100 MΩ for input/output–chassis, input/output–relay and relay–chassis; 500 VDC, 25°C and 70% RH. Radiated emissions BS EN/EN55032 (CISPR32), Class B. Immunity standards BS EN/EN55035, BS EN/EN61000-6-2 and BS EN/EN61204-3. EMC test installation The catalogue tests used a 360 × 720 mm metal plate, 1 mm thick. Verify EMC compliance of the completed equipment after integration. The immunity table specifies EN61000-4-2 ESD at 8 kV air (level 3) / 4 kV contact (level 2), criterion B, and at 4 kV air (level 2) / 2 kV contact (level 1), criterion A. It also lists EN61000-4-3 radiated immunity, 10 V/m (level 3), criterion A; EN61000-4-4 EFT/burst, 2 kV (level 3), criterion A; EN61000-4-5 surge, 0.5 kV at DC input ports (level 3); EN61000-4-6 conducted immunity, 10 V (level 3), criterion A; and EN61000-4-8 magnetic field, 30 A/m (level 4 as printed), criterion A. The conducted-emission, harmonic-current and voltage-flicker entries do not state test levels; the radiated Class B result must not be extended to those unspecified entries. Weight, Reliability and Catalogue Conditions Catalogue unit weight 420 g (0.42 kg), catalogue packing reference per unit from PACKING; not a measured net or shipping weight. Packing reference 20 pieces / 9.4 kg / 1.57 CUFT. MTBF 1376.5 K hours minimum, Telcordia SR-332 (Bellcore); 499.5 K hours minimum, MIL-HDBK-217F at 25°C. Statistical estimates, not guaranteed service life. Manufacturer warranty The catalogue states a three-year warranty; applicable manufacturer terms govern coverage. Default measurement conditions Unless otherwise stated: normal 24 V DC input, rated load and 25°C ambient. Applicable datasheet DUPS40-SPEC, 2026-03-31; combined DBUF/DUPS catalogue pages 20–24.

Read more less

MEAN WELL DUPS20 is a DIN rail DC-UPS controller for 24 V systems, with 24–29 V DC input, 0–20 A battery discharge and 2 A charging. Paired with an external DC power supply and 24 V lead-acid battery, it provides battery backup for the DC load, with bus-status, battery-fail and discharge monitoring. Product Datasheet Download MEAN WELL DUPS Datasheet (PDF) The DUPS section is on PDF pages 15, 16, 17, 18, 19. Refer to the complete mechanical drawings and notes when planning installation. Model and System Function Complete model DUPS20 Model code DUPS identifies the DIN rail DC-UPS module; 20 identifies its 20 A output-current class. Intended system 24 V DC system with an external DC power supply, this UPS controller, an external lead-acid battery and the load. Maximum rated discharge current is 20 A, subject to derating. Applications Industrial control, semiconductor fabrication equipment, factory automation, electromechanical equipment, security, emergency lighting and communications backup. The module connects in parallel with the DC bus and charges the battery during normal operation. When the upstream supply is interrupted, the battery supports the load through the module. Backup duration depends on the battery and load. This is a DC controller requiring an external battery and power supply, not an AC-input UPS or a self-contained capacitor buffer. DC Bus and Battery Ratings Normal DC input 24 V DC nominal; operating input range 24–29 V DC. Rated DC input current 20 A. DC-UPS output-voltage range 21–29 V DC. Confirm that the load accepts this voltage range during backup. Battery-discharge current 0–20 A. Battery-charging current 2 A. Battery chemistry and arrangement 24 V lead-acid battery pack: two 12 V batteries connected in series, or one 24 V battery. External battery capacity 4–135 Ah. Select a compatible battery with suitable discharge capability for the load. Select the external power supply for the DC bus, load and battery-charging demand. The catalogue does not state a separate regulated wattage rating, a numeric transfer-delay guarantee or a complete charging-voltage profile. Battery capacity alone does not guarantee the tabulated backup duration. Battery Protection Reverse battery polarity Internal detection protects against damage; recovery is automatic after the fault is removed. Short-circuit limitation The stated no-damage short-circuit protection works only when batteries are not connected. An external fuse is recommended when a battery is connected. Over-discharge current At 21–23 A, the unit cuts off battery discharge by relay after 3 seconds. This protection threshold is not a continuous-current rating. Deep-discharge protection The battery-discharge path is cut off by relay. No numeric deep-discharge cutoff voltage is specified in these pages. The battery-fail warning threshold below is a monitoring threshold, not a specified deep-discharge cutoff voltage. Select the external fuse for the complete battery circuit according to the installation requirements; the catalogue does not provide an external fuse order code or rating. Internal block-diagram markings must not be used as external fuse-selection instructions. Status Relays and LEDs Contact rating, maximum 30 V DC / 1 A, resistive load. DC BUS OK contact Closed when DC-bus voltage is between 21 and 29 V, with ±2% threshold tolerance. DC BUS OK green LED Lit when the DC bus is OK; dark when the DC bus fails. Battery Fail contact Closed when battery voltage falls below 22 V (±2%) or the battery-test function detects a failure. Battery Fail red LED Lit for an over-discharge warning or a faulty battery; dark when the battery is OK. Automatic battery check The unit tests the battery every 30 seconds. A failed test activates the Battery Fail relay contact and red LED. Battery Discharge contact Closed while the battery is in the discharge condition. Battery Discharge yellow LED Lit when the battery is discharging; dark when it is not discharging or when discharge current is below 1.0 A. A dark yellow LED therefore does not by itself prove zero battery current. The relay contact states and LED indications have separate specified conditions. In particular, do not apply the low-current yellow-LED threshold as an unstated relay switching threshold. Reference Backup Times 2.5 A discharge 6500 s with 7.5 Ah; 14500 s with 12 Ah; 19000 s with 15 Ah. 5 A discharge 3000 s with 7.5 Ah; 7000 s with 12 Ah; 9000 s with 15 Ah. 10 A discharge 1200 s with 7.5 Ah; 2400 s with 12 Ah; 3200 s with 15 Ah. 20 A discharge 400 s with 7.5 Ah; 1100 s with 12 Ah; 1500 s with 15 Ah. These are the catalogue’s reference buffering times for external battery capacities of 7.5, 12 and 15 Ah on PDF page 17. They are not guaranteed runtime values for every battery, temperature, state of charge or age. Keep discharge current within the 20 A rating and the applicable temperature derating. System Wiring and Compatible Modules Basic backup connection The page 19 AC-interruption example connects an external 24 V battery to BAT+ and BAT−, and the external power supply and load in parallel with DC+ and DC−. The illustrated power supply is labelled 24 V / 20 A maximum. Redundancy-module choices DRDN20-24: the 24 V version of the DRDN20 redundancy module named in the application diagram. Its normal input range is 19–29 V DC and its continuous total output limit is 20 A. The illustrated system uses one redundancy module with two external power supplies. System arrangement The second diagram on page 19 combines the battery-backed DC bus with two power supplies and a redundancy module to address AC interruption or a power-supply failure. Follow the complete positive and negative wiring paths shown. Separate system components The external power supplies, battery, redundancy module and protective fuse must be selected for the application. These diagrams do not identify a complete bundled kit or a battery order code. The named redundancy modules are system-level choices, not direct replacements for the UPS controller. Match voltage, current, wiring and redundancy requirements before connection. The catalogue gives no additional complete connector or battery-accessory order code for this module. Cooling, Derating and Environment Cooling and operating temperature Free-air convection; −30 to +70°C, subject to the derating curve. Temperature derating The catalogue curve marked HORIZONTAL permits 100% load from −30°C through +60°C, falling to 75% at +70°C. Follow the plotted segment and the installation instructions. Working humidity 5–95% RH, non-condensing. Storage temperature −40 to +85°C. Temperature coefficient ±0.03%/°C over 0–60°C. Vibration Component: 10–500 Hz, 2 G, 10 minutes per cycle and 60 minutes on each X, Y and Z axis. Mounting compliance: IEC60068-2-6. Operating altitude / category 2000 m; overvoltage category II. The generic catalogue note specifies a fanless ambient-temperature reduction of 3.5°C per 1000 m above 2000 m; it does not establish a higher approved operating-altitude limit for this module. Keep operation within the stated 2000 m rating. Do not treat +70°C as an unconditional full-current operating point. Dimensions, Terminals and DIN Rail Dimensions, W × H × D 40 × 125.2 × 113.5 mm; drawing tolerance ±1 mm; case 992E. TB1: battery connections Pin 1: BAT INPUT +; pin 2: BAT INPUT −. TB1: DC-bus connections Pin 3: DC INPUT −; pin 4: DC INPUT +. TB2: Battery Discharge Pins 1 and 2: Battery Discharge relay contact; yellow LED. TB2: Battery Fail Pins 3 and 4: Battery Fail relay contact; red LED. TB2: DC OK Pins 5 and 6: DC OK relay contact; green LED. DIN rail Fits 35 mm DIN rail TS35/7.5 or TS35/15. The illustrated rail is for reference and is not included. Use the numbered front-view terminal assignment on PDF page 18. Observe battery and DC-bus polarity. These pages do not specify terminal tightening torque, wire gauge or numeric ventilation clearances; follow the installation manual for those details. Safety, Insulation and EMC Catalogue-listed safety approvals UL62368-1, EAC TP TC004 approved. Withstand voltage 0.5 kVAC for input/output to chassis, input/output to relay, and relay to chassis. These test pairs do not state galvanic isolation between DC input and output. Insulation resistance Greater than 100 MΩ for input/output–chassis, input/output–relay and relay–chassis; 500 VDC, 25°C and 70% RH. Radiated emissions BS EN/EN55032 (CISPR32), Class B. Immunity standards BS EN/EN55035, BS EN/EN61000-6-2 and BS EN/EN61204-3. EMC test installation The catalogue tests used a 360 × 720 mm metal plate, 1 mm thick. Verify EMC compliance of the completed equipment after integration. The immunity table specifies EN61000-4-2 ESD at 8 kV air (level 3) / 4 kV contact (level 2), criterion B, and at 4 kV air (level 2) / 2 kV contact (level 1), criterion A. It also lists EN61000-4-3 radiated immunity, 10 V/m (level 3), criterion A; EN61000-4-4 EFT/burst, 2 kV (level 3), criterion A; EN61000-4-5 surge, 0.5 kV at DC input ports (level 3); EN61000-4-6 conducted immunity, 10 V (level 3), criterion A; and EN61000-4-8 magnetic field, 30 A/m (level 4 as printed), criterion A. The conducted-emission, harmonic-current and voltage-flicker entries do not state test levels; the radiated Class B result must not be extended to those unspecified entries. Weight, Reliability and Catalogue Conditions Catalogue unit weight 310 g (0.31 kg), catalogue packing reference per unit from PACKING; not a measured net or shipping weight. Packing reference 20 pieces / 7.2 kg / 1.0 CUFT. MTBF 1252.0 K hours minimum, Telcordia SR-332 (Bellcore); 482.1 K hours minimum, MIL-HDBK-217F at 25°C. Statistical estimates, not guaranteed service life. Manufacturer warranty The catalogue states a three-year warranty; applicable manufacturer terms govern coverage. Default measurement conditions Unless otherwise stated: normal 24 V DC input, rated load and 25°C ambient. Applicable datasheet DUPS20-SPEC, 2026-03-31; combined DBUF/DUPS catalogue pages 15–19.

Read more less

MEAN WELL DBUF40-24 is a DIN rail capacitor buffer module for regulated 24 V DC power supplies. It provides up to 40 A in buffer mode, typically for 250 ms at 22 V/40 A, and bridges short supply interruptions using stored capacitor energy. Select a fixed 22 V or dynamic Vin minus 1 V buffering threshold; it is not a standalone AC/DC power supply. Product Datasheet Download MEAN WELL DBUF40 Datasheet (PDF) The DBUF40 section is on PDF pages 8, 9, 10, 11, 12, 13, 14. Refer to the complete mechanical drawings and notes when planning installation. Model Code and Operating Principle Complete model DBUF40-24 DBUF DIN rail buffer module. 40 40 A maximum buffer-output-current class. 24 24 V DC nominal system operating voltage. Stored energy Electrolytic capacitors rather than lead-acid batteries. Applications Industrial control, semiconductor fabrication equipment, factory automation and electromechanical equipment. The module supplements a regulated DC supply. The block diagram includes reverse-polarity protection, input filtering, a boost converter with inrush limiting, capacitor storage, a buck converter, condition monitoring and optocoupled control/status interfaces. Capacitor buffering avoids periodic lead-acid battery replacement; it does not provide unlimited backup duration. Charging and Standby Nominal system voltage 24 V DC. Charging voltage 23–30 V DC. Charging current, maximum 900 mA. Standby current consumption, maximum 100 mA. Charging time 25 seconds typical; 35 seconds maximum. Allow the capacitor bank to charge before relying on the stated buffering times. The Ready indication distinguishes the charged state from charging or discharged operation. Account for the charging current when selecting the external DC supply. Buffer Output and Hold-up Time Buffer operating voltage 22 V DC in fixed mode, or Vin minus 1 V DC in dynamic mode. Buffer voltage range 22–29 V DC. Output current, maximum 40 A. At 22 V / 40 A 250 ms typical; 160 ms minimum. At 22 V / 20 A 500 ms typical; 320 ms minimum. At 22 V / 0.1 A 62 seconds typical; 42 seconds minimum. Ripple and noise, maximum 350 mVp-p. The typical 22 V buffering curve also marks approximately 1.0 second at 10 A, 0.5 second at 20 A and 0.25 second at 40 A. These are load-dependent typical values; use the separately listed minimum times where a minimum is required. The maximum-current rating does not mean continuous backup without recharging. Ripple and noise are measured with a 20 MHz bandwidth using a 12-inch twisted pair terminated with 0.1 µF and 47 µF capacitors in parallel. Threshold Selection and Status Indication Fixed mode: factory setting Fix 22 V DC. Buffering starts when the terminal voltage falls below 22 V DC. Dynamic mode Vin minus 1 V DC. The specification starts buffering when the terminal voltage decreases by more than 1 V DC. LED steadily on Ready: capacitors fully charged. LED off Capacitors discharged. LED flashes at 1 Hz Charging. LED flashes at 10 Hz Buffering / capacitor discharge. The operating diagram separates charging, standby and buffer modes. Ready is high in the charged standby period and low during charging and buffering; Buffering is high during the buffer period and low in the other modes. The PSU hold-up interval and the module buffer interval are distinct. Control and Signal Electrical Limits Inhibit input I: module on +Vs − V(I) < 6 V DC. Inhibit input I: module off +Vs − V(I) > 10 V DC. Inhibit input rating, maximum 35 V DC / 4 mA. Ready R: charged V(R) > +Vs − 2 V DC. Ready R: unready V(R) < 1 V DC. Ready signal rating, maximum 35 V DC / 10 mA. Buffering B: buffering active V(B) > +Vs − 2 V DC. Buffering B: other modes V(B) < 1 V DC. Buffering signal rating, maximum 35 V DC / 10 mA. Signal supply +Vs 10–35 V DC / 10 mA; connected to module +V or an external voltage source. Signal protection 35 V maximum TVS rating is listed. Use the specified voltage differences when wiring Inhibit; do not treat its on/off limits as an ordinary voltage-to-ground logic input. The catalogue does not assign a logic state to the interval between the two Inhibit thresholds. The schematics show optocoupled control/status circuitry. External relays, lamps or signal interfaces shown in the application diagrams must remain within the signal ratings; they are not built-in dry relay contacts. Follow the full signal schematic and the internal-supply or external-supply wiring diagram. Protection and Recovery Overvoltage 31–37.5 V: output voltage shuts down. Overload in buffer mode 105–125% of rated output power; output voltage shuts down. Re-power on to recover. Short circuit Output voltage shuts down. Re-power on to recover. Reverse polarity Internal MOSFET protection prevents damage; automatic recovery after the fault condition is removed. The overvoltage entry specifies shutdown but does not separately state its recovery method. Use the stated re-power recovery for overload and short circuit; do not substitute a continuous current-limit or hiccup characteristic. System Wiring and Parallel Modules General arrangement Connect the regulated DC supply, load and buffer module to the common DC rails as shown in the application diagram. Signal supply arrangements The catalogue shows signal power from the module +V terminal and a separate arrangement using an external voltage source. Parallel buffer modules Supported to increase output ampacity or hold-up time; follow the complete parallel-module diagram. The parallel example connects both modules to the common DC rails and shows their control/status wiring. The reviewed pages do not specify a maximum module count, a current-sharing multiplier or a guaranteed linear extension of hold-up time; do not infer those limits from the example. Each module and all external supplies, wiring and signal interfaces must remain within their own ratings. Environment and Derating Cooling Free-air convection. Working ambient temperature −25 to +75°C. Temperature curve 100% load throughout −25 to +75°C in the illustrated vertical mounting position. Working humidity 5–95% RH, non-condensing. Storage temperature −25 to +80°C. Temperature coefficient ±0.03%/°C from 0 to 75°C. Operating altitude / category 5000 m maximum; overvoltage category II. Altitude temperature derating For this fanless model, reduce the permissible ambient temperature by 3.5°C per 1000 m above 2000 m (6500 ft). Shock IEC60068-2-27: 30 G (printed as 300 m/s²), 18 ms, once per direction and twice in total. Component vibration 10–500 Hz, 2 G, 10 minutes per cycle; 60 minutes along each X, Y and Z axis. Mounting clip vibration Compliance with IEC60068-2-6 is listed. The flat temperature curve applies to the documented vertical mounting and stated conditions. Apply altitude derating as well; the temperature range is not a substitute for ventilation and correct installation. Terminals, Dimensions and Installation Dimensions (W × H × D) 63 × 125.2 × 114.9 mm; drawing tolerance ±1 mm. Case number 979E. TB1 pins 1 and 2 DC +V. TB1 pins 3 and 4 DC −V. TB2 pin 1 FG. TB2 pin 2 Inhibit (I). TB2 pin 3 Ready (R). TB2 pin 4 Buffering (B). TB2 pin 5 Supply voltage (+Vs). Mounting rail DIN rail TS35/7.5 or TS35/15; rail not included. Keep terminal numbering and polarity consistent with the full mechanical drawing on PDF page 14. Install in the vertical orientation used by the thermal curve and consult the manufacturer installation instructions for mounting and wiring details. Accessories and Scope of Supply Compatible DIN rails TS35/7.5 and TS35/15 are shown for reference and are not supplied with the unit. External system components The DC supply, load, external signal-voltage source, relays, lamps and Inhibit switch shown in the wiring examples are system components, not a bundled set. The reviewed DBUF40 pages provide terminal assignments and wiring diagrams but no separately orderable connector, cable or mounting-kit code. Select installation components against the documented interfaces and ratings rather than assuming compatibility with another family. Safety, Isolation and EMC Listed safety approvals IEC62368-1 and UL62368-1. Withstand voltage IP/OP-to-FG: 2.2 kV DC; Signals-to-FG: 2.2 kV DC. Insulation resistance Greater than 100 MΩ for IP/OP-to-FG and Signals-to-FG, measured at 500 V DC, 25°C and 70% RH. Conducted and radiated emissions BS EN/EN55032, Class B for both. Immunity standards BS EN/EN55035 and BS EN/EN61000-6-2. ESD BS EN/EN61000-4-2: Level 4, 15 kV air; Level 3, 8 kV contact; criterion A. Radiated immunity BS EN/EN61000-4-3: Level 3, 10 V/m; criterion A. EFT / burst BS EN/EN61000-4-4: Level 3, 2 kV; criterion A. Surge BS EN/EN61000-4-5: Level 3, 1 kV line-to-line; Level 3, 2 kV line-line-to-FG; criterion A. Conducted immunity BS EN/EN61000-4-6: Level 3, 10 V; criterion A. Magnetic-field immunity BS EN/EN61000-4-8: Level 4, 30 A/m; criterion A. The isolation figures apply to the named FG boundaries; they do not establish a separate AC input rating or an unlisted input-to-output isolation rating. EMC compliance must be re-confirmed for the completed equipment. Weight, Reliability and Reference Conditions Catalogue unit-weight reference 1062 g, converted from the explicit 1.062 kg per-unit PACKING figure. This is not a measured net weight or shipping-package weight, and is not calculated by dividing carton weight. MTBF at 25°C 162.6 K hours minimum, MIL-HDBK-217F; 1420.2 K hours minimum, Telcordia TR/SR-332 (Bellcore). MTBF at 40°C 106.8 K hours minimum, MIL-HDBK-217F; 717.2 K hours minimum, Telcordia TR/SR-332 (Bellcore). Manufacturer warranty statement The catalogue lists a three-year warranty; manufacturer terms govern coverage. Default test conditions Normal input, rated load and 25°C ambient unless otherwise stated. Datasheet version DBUF40-24-SPEC, 2026-03-31; combined catalogue pages 8–14. MTBF figures are statistical reliability estimates, not a guaranteed service life. The stated hold-up times depend on load and the charged capacitor state.

Read more less

MEAN WELL DBUF40-24 is a DIN rail capacitor buffer module for regulated 24 V DC power supplies. It provides up to 40 A in buffer mode, typically for 250 ms at 22 V/40 A, and bridges short supply interruptions using stored capacitor energy. Select a fixed 22 V or dynamic Vin minus 1 V buffering threshold; it is not a standalone AC/DC power supply. Product Datasheet Download MEAN WELL DBUF40 Datasheet (PDF) The DBUF40 section is on PDF pages 8, 9, 10, 11, 12, 13, 14. Refer to the complete mechanical drawings and notes when planning installation. Model Code and Operating Principle Complete model DBUF40-24 DBUF DIN rail buffer module. 40 40 A maximum buffer-output-current class. 24 24 V DC nominal system operating voltage. Stored energy Electrolytic capacitors rather than lead-acid batteries. Applications Industrial control, semiconductor fabrication equipment, factory automation and electromechanical equipment. The module supplements a regulated DC supply. The block diagram includes reverse-polarity protection, input filtering, a boost converter with inrush limiting, capacitor storage, a buck converter, condition monitoring and optocoupled control/status interfaces. Capacitor buffering avoids periodic lead-acid battery replacement; it does not provide unlimited backup duration. Charging and Standby Nominal system voltage 24 V DC. Charging voltage 23–30 V DC. Charging current, maximum 900 mA. Standby current consumption, maximum 100 mA. Charging time 25 seconds typical; 35 seconds maximum. Allow the capacitor bank to charge before relying on the stated buffering times. The Ready indication distinguishes the charged state from charging or discharged operation. Account for the charging current when selecting the external DC supply. Buffer Output and Hold-up Time Buffer operating voltage 22 V DC in fixed mode, or Vin minus 1 V DC in dynamic mode. Buffer voltage range 22–29 V DC. Output current, maximum 40 A. At 22 V / 40 A 250 ms typical; 160 ms minimum. At 22 V / 20 A 500 ms typical; 320 ms minimum. At 22 V / 0.1 A 62 seconds typical; 42 seconds minimum. Ripple and noise, maximum 350 mVp-p. The typical 22 V buffering curve also marks approximately 1.0 second at 10 A, 0.5 second at 20 A and 0.25 second at 40 A. These are load-dependent typical values; use the separately listed minimum times where a minimum is required. The maximum-current rating does not mean continuous backup without recharging. Ripple and noise are measured with a 20 MHz bandwidth using a 12-inch twisted pair terminated with 0.1 µF and 47 µF capacitors in parallel. Threshold Selection and Status Indication Fixed mode: factory setting Fix 22 V DC. Buffering starts when the terminal voltage falls below 22 V DC. Dynamic mode Vin minus 1 V DC. The specification starts buffering when the terminal voltage decreases by more than 1 V DC. LED steadily on Ready: capacitors fully charged. LED off Capacitors discharged. LED flashes at 1 Hz Charging. LED flashes at 10 Hz Buffering / capacitor discharge. The operating diagram separates charging, standby and buffer modes. Ready is high in the charged standby period and low during charging and buffering; Buffering is high during the buffer period and low in the other modes. The PSU hold-up interval and the module buffer interval are distinct. Control and Signal Electrical Limits Inhibit input I: module on +Vs − V(I) < 6 V DC. Inhibit input I: module off +Vs − V(I) > 10 V DC. Inhibit input rating, maximum 35 V DC / 4 mA. Ready R: charged V(R) > +Vs − 2 V DC. Ready R: unready V(R) < 1 V DC. Ready signal rating, maximum 35 V DC / 10 mA. Buffering B: buffering active V(B) > +Vs − 2 V DC. Buffering B: other modes V(B) < 1 V DC. Buffering signal rating, maximum 35 V DC / 10 mA. Signal supply +Vs 10–35 V DC / 10 mA; connected to module +V or an external voltage source. Signal protection 35 V maximum TVS rating is listed. Use the specified voltage differences when wiring Inhibit; do not treat its on/off limits as an ordinary voltage-to-ground logic input. The catalogue does not assign a logic state to the interval between the two Inhibit thresholds. The schematics show optocoupled control/status circuitry. External relays, lamps or signal interfaces shown in the application diagrams must remain within the signal ratings; they are not built-in dry relay contacts. Follow the full signal schematic and the internal-supply or external-supply wiring diagram. Protection and Recovery Overvoltage 31–37.5 V: output voltage shuts down. Overload in buffer mode 105–125% of rated output power; output voltage shuts down. Re-power on to recover. Short circuit Output voltage shuts down. Re-power on to recover. Reverse polarity Internal MOSFET protection prevents damage; automatic recovery after the fault condition is removed. The overvoltage entry specifies shutdown but does not separately state its recovery method. Use the stated re-power recovery for overload and short circuit; do not substitute a continuous current-limit or hiccup characteristic. System Wiring and Parallel Modules General arrangement Connect the regulated DC supply, load and buffer module to the common DC rails as shown in the application diagram. Signal supply arrangements The catalogue shows signal power from the module +V terminal and a separate arrangement using an external voltage source. Parallel buffer modules Supported to increase output ampacity or hold-up time; follow the complete parallel-module diagram. The parallel example connects both modules to the common DC rails and shows their control/status wiring. The reviewed pages do not specify a maximum module count, a current-sharing multiplier or a guaranteed linear extension of hold-up time; do not infer those limits from the example. Each module and all external supplies, wiring and signal interfaces must remain within their own ratings. Environment and Derating Cooling Free-air convection. Working ambient temperature −25 to +75°C. Temperature curve 100% load throughout −25 to +75°C in the illustrated vertical mounting position. Working humidity 5–95% RH, non-condensing. Storage temperature −25 to +80°C. Temperature coefficient ±0.03%/°C from 0 to 75°C. Operating altitude / category 5000 m maximum; overvoltage category II. Altitude temperature derating For this fanless model, reduce the permissible ambient temperature by 3.5°C per 1000 m above 2000 m (6500 ft). Shock IEC60068-2-27: 30 G (printed as 300 m/s²), 18 ms, once per direction and twice in total. Component vibration 10–500 Hz, 2 G, 10 minutes per cycle; 60 minutes along each X, Y and Z axis. Mounting clip vibration Compliance with IEC60068-2-6 is listed. The flat temperature curve applies to the documented vertical mounting and stated conditions. Apply altitude derating as well; the temperature range is not a substitute for ventilation and correct installation. Terminals, Dimensions and Installation Dimensions (W × H × D) 63 × 125.2 × 114.9 mm; drawing tolerance ±1 mm. Case number 979E. TB1 pins 1 and 2 DC +V. TB1 pins 3 and 4 DC −V. TB2 pin 1 FG. TB2 pin 2 Inhibit (I). TB2 pin 3 Ready (R). TB2 pin 4 Buffering (B). TB2 pin 5 Supply voltage (+Vs). Mounting rail DIN rail TS35/7.5 or TS35/15; rail not included. Keep terminal numbering and polarity consistent with the full mechanical drawing on PDF page 14. Install in the vertical orientation used by the thermal curve and consult the manufacturer installation instructions for mounting and wiring details. Accessories and Scope of Supply Compatible DIN rails TS35/7.5 and TS35/15 are shown for reference and are not supplied with the unit. External system components The DC supply, load, external signal-voltage source, relays, lamps and Inhibit switch shown in the wiring examples are system components, not a bundled set. The reviewed DBUF40 pages provide terminal assignments and wiring diagrams but no separately orderable connector, cable or mounting-kit code. Select installation components against the documented interfaces and ratings rather than assuming compatibility with another family. Safety, Isolation and EMC Listed safety approvals IEC62368-1 and UL62368-1. Withstand voltage IP/OP-to-FG: 2.2 kV DC; Signals-to-FG: 2.2 kV DC. Insulation resistance Greater than 100 MΩ for IP/OP-to-FG and Signals-to-FG, measured at 500 V DC, 25°C and 70% RH. Conducted and radiated emissions BS EN/EN55032, Class B for both. Immunity standards BS EN/EN55035 and BS EN/EN61000-6-2. ESD BS EN/EN61000-4-2: Level 4, 15 kV air; Level 3, 8 kV contact; criterion A. Radiated immunity BS EN/EN61000-4-3: Level 3, 10 V/m; criterion A. EFT / burst BS EN/EN61000-4-4: Level 3, 2 kV; criterion A. Surge BS EN/EN61000-4-5: Level 3, 1 kV line-to-line; Level 3, 2 kV line-line-to-FG; criterion A. Conducted immunity BS EN/EN61000-4-6: Level 3, 10 V; criterion A. Magnetic-field immunity BS EN/EN61000-4-8: Level 4, 30 A/m; criterion A. The isolation figures apply to the named FG boundaries; they do not establish a separate AC input rating or an unlisted input-to-output isolation rating. EMC compliance must be re-confirmed for the completed equipment. Weight, Reliability and Reference Conditions Catalogue unit-weight reference 1062 g, converted from the explicit 1.062 kg per-unit PACKING figure. This is not a measured net weight or shipping-package weight, and is not calculated by dividing carton weight. MTBF at 25°C 162.6 K hours minimum, MIL-HDBK-217F; 1420.2 K hours minimum, Telcordia TR/SR-332 (Bellcore). MTBF at 40°C 106.8 K hours minimum, MIL-HDBK-217F; 717.2 K hours minimum, Telcordia TR/SR-332 (Bellcore). Manufacturer warranty statement The catalogue lists a three-year warranty; manufacturer terms govern coverage. Default test conditions Normal input, rated load and 25°C ambient unless otherwise stated. Datasheet version DBUF40-24-SPEC, 2026-03-31; combined catalogue pages 8–14. MTBF figures are statistical reliability estimates, not a guaranteed service life. The stated hold-up times depend on load and the charged capacitor state.

Read more less

MEAN WELL DBUF40-24 is a DIN rail capacitor buffer module for regulated 24 V DC power supplies. It provides up to 40 A in buffer mode, typically for 250 ms at 22 V/40 A, and bridges short supply interruptions using stored capacitor energy. Select a fixed 22 V or dynamic Vin minus 1 V buffering threshold; it is not a standalone AC/DC power supply. Product Datasheet Download MEAN WELL DBUF40 Datasheet (PDF) The DBUF40 section is on PDF pages 8, 9, 10, 11, 12, 13, 14. Refer to the complete mechanical drawings and notes when planning installation. Model Code and Operating Principle Complete model DBUF40-24 DBUF DIN rail buffer module. 40 40 A maximum buffer-output-current class. 24 24 V DC nominal system operating voltage. Stored energy Electrolytic capacitors rather than lead-acid batteries. Applications Industrial control, semiconductor fabrication equipment, factory automation and electromechanical equipment. The module supplements a regulated DC supply. The block diagram includes reverse-polarity protection, input filtering, a boost converter with inrush limiting, capacitor storage, a buck converter, condition monitoring and optocoupled control/status interfaces. Capacitor buffering avoids periodic lead-acid battery replacement; it does not provide unlimited backup duration. Charging and Standby Nominal system voltage 24 V DC. Charging voltage 23–30 V DC. Charging current, maximum 900 mA. Standby current consumption, maximum 100 mA. Charging time 25 seconds typical; 35 seconds maximum. Allow the capacitor bank to charge before relying on the stated buffering times. The Ready indication distinguishes the charged state from charging or discharged operation. Account for the charging current when selecting the external DC supply. Buffer Output and Hold-up Time Buffer operating voltage 22 V DC in fixed mode, or Vin minus 1 V DC in dynamic mode. Buffer voltage range 22–29 V DC. Output current, maximum 40 A. At 22 V / 40 A 250 ms typical; 160 ms minimum. At 22 V / 20 A 500 ms typical; 320 ms minimum. At 22 V / 0.1 A 62 seconds typical; 42 seconds minimum. Ripple and noise, maximum 350 mVp-p. The typical 22 V buffering curve also marks approximately 1.0 second at 10 A, 0.5 second at 20 A and 0.25 second at 40 A. These are load-dependent typical values; use the separately listed minimum times where a minimum is required. The maximum-current rating does not mean continuous backup without recharging. Ripple and noise are measured with a 20 MHz bandwidth using a 12-inch twisted pair terminated with 0.1 µF and 47 µF capacitors in parallel. Threshold Selection and Status Indication Fixed mode: factory setting Fix 22 V DC. Buffering starts when the terminal voltage falls below 22 V DC. Dynamic mode Vin minus 1 V DC. The specification starts buffering when the terminal voltage decreases by more than 1 V DC. LED steadily on Ready: capacitors fully charged. LED off Capacitors discharged. LED flashes at 1 Hz Charging. LED flashes at 10 Hz Buffering / capacitor discharge. The operating diagram separates charging, standby and buffer modes. Ready is high in the charged standby period and low during charging and buffering; Buffering is high during the buffer period and low in the other modes. The PSU hold-up interval and the module buffer interval are distinct. Control and Signal Electrical Limits Inhibit input I: module on +Vs − V(I) < 6 V DC. Inhibit input I: module off +Vs − V(I) > 10 V DC. Inhibit input rating, maximum 35 V DC / 4 mA. Ready R: charged V(R) > +Vs − 2 V DC. Ready R: unready V(R) < 1 V DC. Ready signal rating, maximum 35 V DC / 10 mA. Buffering B: buffering active V(B) > +Vs − 2 V DC. Buffering B: other modes V(B) < 1 V DC. Buffering signal rating, maximum 35 V DC / 10 mA. Signal supply +Vs 10–35 V DC / 10 mA; connected to module +V or an external voltage source. Signal protection 35 V maximum TVS rating is listed. Use the specified voltage differences when wiring Inhibit; do not treat its on/off limits as an ordinary voltage-to-ground logic input. The catalogue does not assign a logic state to the interval between the two Inhibit thresholds. The schematics show optocoupled control/status circuitry. External relays, lamps or signal interfaces shown in the application diagrams must remain within the signal ratings; they are not built-in dry relay contacts. Follow the full signal schematic and the internal-supply or external-supply wiring diagram. Protection and Recovery Overvoltage 31–37.5 V: output voltage shuts down. Overload in buffer mode 105–125% of rated output power; output voltage shuts down. Re-power on to recover. Short circuit Output voltage shuts down. Re-power on to recover. Reverse polarity Internal MOSFET protection prevents damage; automatic recovery after the fault condition is removed. The overvoltage entry specifies shutdown but does not separately state its recovery method. Use the stated re-power recovery for overload and short circuit; do not substitute a continuous current-limit or hiccup characteristic. System Wiring and Parallel Modules General arrangement Connect the regulated DC supply, load and buffer module to the common DC rails as shown in the application diagram. Signal supply arrangements The catalogue shows signal power from the module +V terminal and a separate arrangement using an external voltage source. Parallel buffer modules Supported to increase output ampacity or hold-up time; follow the complete parallel-module diagram. The parallel example connects both modules to the common DC rails and shows their control/status wiring. The reviewed pages do not specify a maximum module count, a current-sharing multiplier or a guaranteed linear extension of hold-up time; do not infer those limits from the example. Each module and all external supplies, wiring and signal interfaces must remain within their own ratings. Environment and Derating Cooling Free-air convection. Working ambient temperature −25 to +75°C. Temperature curve 100% load throughout −25 to +75°C in the illustrated vertical mounting position. Working humidity 5–95% RH, non-condensing. Storage temperature −25 to +80°C. Temperature coefficient ±0.03%/°C from 0 to 75°C. Operating altitude / category 5000 m maximum; overvoltage category II. Altitude temperature derating For this fanless model, reduce the permissible ambient temperature by 3.5°C per 1000 m above 2000 m (6500 ft). Shock IEC60068-2-27: 30 G (printed as 300 m/s²), 18 ms, once per direction and twice in total. Component vibration 10–500 Hz, 2 G, 10 minutes per cycle; 60 minutes along each X, Y and Z axis. Mounting clip vibration Compliance with IEC60068-2-6 is listed. The flat temperature curve applies to the documented vertical mounting and stated conditions. Apply altitude derating as well; the temperature range is not a substitute for ventilation and correct installation. Terminals, Dimensions and Installation Dimensions (W × H × D) 63 × 125.2 × 114.9 mm; drawing tolerance ±1 mm. Case number 979E. TB1 pins 1 and 2 DC +V. TB1 pins 3 and 4 DC −V. TB2 pin 1 FG. TB2 pin 2 Inhibit (I). TB2 pin 3 Ready (R). TB2 pin 4 Buffering (B). TB2 pin 5 Supply voltage (+Vs). Mounting rail DIN rail TS35/7.5 or TS35/15; rail not included. Keep terminal numbering and polarity consistent with the full mechanical drawing on PDF page 14. Install in the vertical orientation used by the thermal curve and consult the manufacturer installation instructions for mounting and wiring details. Accessories and Scope of Supply Compatible DIN rails TS35/7.5 and TS35/15 are shown for reference and are not supplied with the unit. External system components The DC supply, load, external signal-voltage source, relays, lamps and Inhibit switch shown in the wiring examples are system components, not a bundled set. The reviewed DBUF40 pages provide terminal assignments and wiring diagrams but no separately orderable connector, cable or mounting-kit code. Select installation components against the documented interfaces and ratings rather than assuming compatibility with another family. Safety, Isolation and EMC Listed safety approvals IEC62368-1 and UL62368-1. Withstand voltage IP/OP-to-FG: 2.2 kV DC; Signals-to-FG: 2.2 kV DC. Insulation resistance Greater than 100 MΩ for IP/OP-to-FG and Signals-to-FG, measured at 500 V DC, 25°C and 70% RH. Conducted and radiated emissions BS EN/EN55032, Class B for both. Immunity standards BS EN/EN55035 and BS EN/EN61000-6-2. ESD BS EN/EN61000-4-2: Level 4, 15 kV air; Level 3, 8 kV contact; criterion A. Radiated immunity BS EN/EN61000-4-3: Level 3, 10 V/m; criterion A. EFT / burst BS EN/EN61000-4-4: Level 3, 2 kV; criterion A. Surge BS EN/EN61000-4-5: Level 3, 1 kV line-to-line; Level 3, 2 kV line-line-to-FG; criterion A. Conducted immunity BS EN/EN61000-4-6: Level 3, 10 V; criterion A. Magnetic-field immunity BS EN/EN61000-4-8: Level 4, 30 A/m; criterion A. The isolation figures apply to the named FG boundaries; they do not establish a separate AC input rating or an unlisted input-to-output isolation rating. EMC compliance must be re-confirmed for the completed equipment. Weight, Reliability and Reference Conditions Catalogue unit-weight reference 1062 g, converted from the explicit 1.062 kg per-unit PACKING figure. This is not a measured net weight or shipping-package weight, and is not calculated by dividing carton weight. MTBF at 25°C 162.6 K hours minimum, MIL-HDBK-217F; 1420.2 K hours minimum, Telcordia TR/SR-332 (Bellcore). MTBF at 40°C 106.8 K hours minimum, MIL-HDBK-217F; 717.2 K hours minimum, Telcordia TR/SR-332 (Bellcore). Manufacturer warranty statement The catalogue lists a three-year warranty; manufacturer terms govern coverage. Default test conditions Normal input, rated load and 25°C ambient unless otherwise stated. Datasheet version DBUF40-24-SPEC, 2026-03-31; combined catalogue pages 8–14. MTBF figures are statistical reliability estimates, not a guaranteed service life. The stated hold-up times depend on load and the charged capacitor state.

Read more less

MEAN WELL DBUF20-24 is a DIN rail electrolytic-capacitor buffer module for regulated 24 VDC systems, with a maximum buffer output current of 20 A. At 22 VDC and 20 A it provides 350 ms typical and 250 ms minimum buffering. It supports selectable fixed or dynamic trigger thresholds and status monitoring; duration depends on the load and operating conditions. Product Datasheet Download MEAN WELL DBUF20 Datasheet (PDF) The DBUF20 section is on PDF pages 1, 2, 3, 4, 5, 6, 7. Refer to the complete mechanical drawings and notes when planning installation. Model and Operating Principle Complete model DBUF20-24 Product type DIN rail buffer module for a regulated 24 VDC power supply. Energy is stored in electrolytic capacitors instead of lead-acid batteries. Model code DBUF identifies the DIN rail buffer family; 20 is the 20 A maximum buffer output; 24 is the nominal system voltage. Use Supplementary short-duration support for industrial controls, semiconductor fabrication equipment, factory automation and electromechanical apparatus. The module charges from an existing DC supply and releases stored energy when the selected voltage threshold is reached. It is not an AC-input power supply or a battery UPS with unlimited hold-up time. Charging and DC Buffer Ratings Nominal system voltage 24 VDC. Charging voltage 23–30 VDC. Charging / standby current 900 mA maximum during charging; 100 mA maximum in standby. Allow for this additional demand when sizing the upstream supply. Charging time 15 s typical; 25 s maximum. Buffer operating range 22–29 VDC. Fixed mode uses 22 VDC; dynamic mode follows the Vin−1 V setting described below. Maximum buffer current 20 A per DBUF20-24, subject to the finite buffering time and installation conditions. Buffer time at 20 A At 22 VDC: 350 ms typical; 250 ms minimum. Buffer time at 10 A At 22 VDC: 700 ms typical; 500 ms minimum. Buffer time at 0.1 A At 22 VDC: 45 s typical; 30 s minimum. Additional curve reference The typical 22 VDC buffering curve marks approximately 1.4 s at 5 A. Use the complete curve for intermediate loads; do not treat a typical curve value as a guaranteed minimum. Ripple and noise, maximum 200 mVp-p. Measured at 20 MHz bandwidth using a 12-inch twisted pair terminated by parallel 0.1 µF and 47 µF capacitors. Charging and buffering have different voltage ranges. All three tabulated buffering cases apply to this same complete model; they are operating points, not separate output-channel or power-supply variants. Mode Selector and Status Indication Fixed mode — factory setting With the switch at Fix 22Vdc, buffering starts when terminal voltage falls below 22 VDC. Dynamic mode With the switch at Vin−1Vdc, buffering starts when the input terminal voltage decreases by 1 VDC. LED continuously on Ready: the capacitors are fully charged. LED off The capacitors are discharged. LED flashing at 1 Hz The capacitors are charging. LED flashing at 10 Hz The module is buffering and its capacitors are discharging. The operating diagram shows charging, standby and buffer states separately. After the upstream supply loses AC input, its own hold-up interval precedes the module’s illustrated buffering interval. Control and Monitoring Signals Signal supply +Vs 10–35 VDC / 10 mA as specified. Supply +Vs from the module’s +V or from an external voltage source using the corresponding application wiring. Inhibit input I Buffer module ON when +Vs−V(I) <6 VDC; buffer module OFF when +Vs−V(I) >10 VDC. Maximum: 35 VDC / 4 mA. The intermediate region is not assigned a guaranteed state. Ready output R Charged-ready state: V(R) >+Vs−2 VDC. Unready state: V(R) <1 VDC. Maximum: 35 VDC / 10 mA. Buffering output B Buffering state: V(B) >+Vs−2 VDC. Other modes: V(B) <1 VDC. Maximum: 35 VDC / 10 mA. Signal interface The block and signal diagrams show optocouplers for I, R and B. These monitoring outputs are not specified as potential-free relay contacts. Follow the complete application circuit for signal return paths, external indicators or relay loads and the inhibit switch. The diagrams show both a signal supply taken from the DC rail and a separate external signal supply; do not substitute an AC connection at these signal terminals. Protection Overvoltage 31–37.5 V: output-voltage shutdown. Overload in buffer mode 105–125% of rated output power as specified; output-voltage shutdown, re-power to recover. This is a protection threshold, not an additional continuous-output rating. Short circuit Output-voltage shutdown; re-power to recover. Reverse polarity Internal MOSFET protection; automatic recovery after the fault is removed. Signal TVS rating 35 V maximum, as listed in the protection table. Use the charging, buffer and signal-terminal limits for their respective circuits. Protection does not replace correct polarity, wiring or load sizing. Connection and Parallel Applications Main DC wiring Connect the regulated DC supply, load and buffer module to the same DC rails with the polarities shown in the general wiring diagram. The module’s main terminals are +V and −V; there are no AC L/N input terminals on this module. Parallel buffer units The catalogue allows parallel buffer modules to increase output capacity or extend buffering time and provides a two-unit example. Follow the illustrated main-rail and signal wiring for each unit. Parallel selection limits The assigned catalogue pages do not state a numerical maximum unit count or a guaranteed combined buffer-time formula. Keep each unit within its own ratings and size the upstream supply for charging demand as well as the load. External application components The diagrams show a power supply, load, Ready/Buffering relay or signal loads, an inhibit switch and an optional external signal-voltage source. Complete order codes and included quantities for these external items are not specified. The illustrated application parts are not a promise that relays, indicators, switches or another power supply are supplied with the DBUF20-24. Cooling and Environment Cooling / working temperature Free-air convection; −25 to +75°C. The vertical-installation load curve shows 100% through this range, subject to the other catalogue conditions. Working humidity 5–95% RH, non-condensing. Storage temperature −25 to +80°C. Temperature coefficient ±0.03%/°C over 0–75°C. Operating altitude Up to 5,000 m; overvoltage category II. Above 2,000 m, reduce the permissible ambient temperature by 3.5°C per 1,000 m for this fanless design. Shock test IEC60068-2-27; 30 G (300 m/s²), 18 ms, one time per direction and two times in total as listed. Vibration Component: 10–500 Hz, 2 G, 10 minutes per cycle, 60 minutes each along X, Y and Z. Mounting clip: compliance with IEC60068-2-6. Apply the installation orientation, altitude and DC operating limits together; the ambient-temperature endpoint does not remove the finite-energy buffering limit. Dimensions, Terminals and Mounting Dimensions, W × H × D 63 × 125.2 × 114.9 mm; drawing tolerance ±1 mm; case 979E. TB1 main terminals Pins 1 and 2: DC +V. Pins 3 and 4: DC −V. TB2 signal terminals Pin 1: FG; pin 2: Inhibit (I); pin 3: Ready (R); pin 4: Buffering (B); pin 5: supply voltage (+Vs). Front elements The main terminal block, mode selector and status LED are above the lower signal terminal block, as shown in the mechanical drawing. DIN rail Fits TS35/7.5 or TS35/15. The rail illustrated is for reference and is not included with the unit. Mount vertically and follow the supplied installation instructions. The catalogue does not specify terminal torque, conductor size or a separate complete mounting-accessory order code in these assigned pages; select and install these items using the applicable installation documentation. Safety, EMC and Measurement Conditions Safety approvals IEC62368-1 and UL62368-1 are listed as approved. Withstand voltage Combined input/output circuit to FG: 2.2 kVDC; signals to FG: 2.2 kVDC. No input-to-output isolation rating is inferred. Isolation resistance Greater than 100 MΩ for input/output-to-FG and signals-to-FG, tested at 500 VDC, 25°C and 70% RH. EMC emissions Conducted and radiated emissions: BS EN/EN55032 Class B. No harmonic-current or flicker test level is listed for this DC buffer module. EMC immunity framework BS EN/EN55035 and BS EN/EN61000-6-2. The following listed tests use criterion A. ESD / radiated immunity BS EN/EN61000-4-2: 15 kV air and 8 kV contact discharge. BS EN/EN61000-4-3: 10 V/m. EFT / surge immunity BS EN/EN61000-4-4: 2 kV. BS EN/EN61000-4-5: 1 kV line-to-line and 2 kV line-to-FG. Conducted / magnetic-field immunity BS EN/EN61000-4-6: 10 V. BS EN/EN61000-4-8: 30 A/m. Default measurement conditions Unless stated otherwise: normal input, rated load and 25°C ambient. Reconfirm compliance of the completed equipment and the whole system with the applicable EMC requirements. Weight and Reliability Single-unit catalogue weight 1,062 g (1.062 kg), explicitly stated in the PACKING entry. This is a single-unit catalogue reference, not a shipping-package weight or measured net-weight claim. Packing reference 12 pieces / 12.8 kg / 0.74 CUFT. MTBF estimates at 25°C 164.8 thousand hours minimum by MIL-HDBK-217F; 1,510.0 thousand hours minimum by Telcordia TR/SR-332 (Bellcore). MTBF estimates at 40°C 108.6 thousand hours minimum by MIL-HDBK-217F; 765.8 thousand hours minimum by Telcordia TR/SR-332 (Bellcore). Catalogue warranty The catalogue lists a 3-year manufacturer warranty, subject to the applicable terms. MTBF figures are statistical estimates under the named methods, not guaranteed service life.

Read more less

MEAN WELL DBUF20-24 is a DIN rail electrolytic-capacitor buffer module for regulated 24 VDC systems, with a maximum buffer output current of 20 A. At 22 VDC and 20 A it provides 350 ms typical and 250 ms minimum buffering. It supports selectable fixed or dynamic trigger thresholds and status monitoring; duration depends on the load and operating conditions. Product Datasheet Download MEAN WELL DBUF20 Datasheet (PDF) The DBUF20 section is on PDF pages 1, 2, 3, 4, 5, 6, 7. Refer to the complete mechanical drawings and notes when planning installation. Model and Operating Principle Complete model DBUF20-24 Product type DIN rail buffer module for a regulated 24 VDC power supply. Energy is stored in electrolytic capacitors instead of lead-acid batteries. Model code DBUF identifies the DIN rail buffer family; 20 is the 20 A maximum buffer output; 24 is the nominal system voltage. Use Supplementary short-duration support for industrial controls, semiconductor fabrication equipment, factory automation and electromechanical apparatus. The module charges from an existing DC supply and releases stored energy when the selected voltage threshold is reached. It is not an AC-input power supply or a battery UPS with unlimited hold-up time. Charging and DC Buffer Ratings Nominal system voltage 24 VDC. Charging voltage 23–30 VDC. Charging / standby current 900 mA maximum during charging; 100 mA maximum in standby. Allow for this additional demand when sizing the upstream supply. Charging time 15 s typical; 25 s maximum. Buffer operating range 22–29 VDC. Fixed mode uses 22 VDC; dynamic mode follows the Vin−1 V setting described below. Maximum buffer current 20 A per DBUF20-24, subject to the finite buffering time and installation conditions. Buffer time at 20 A At 22 VDC: 350 ms typical; 250 ms minimum. Buffer time at 10 A At 22 VDC: 700 ms typical; 500 ms minimum. Buffer time at 0.1 A At 22 VDC: 45 s typical; 30 s minimum. Additional curve reference The typical 22 VDC buffering curve marks approximately 1.4 s at 5 A. Use the complete curve for intermediate loads; do not treat a typical curve value as a guaranteed minimum. Ripple and noise, maximum 200 mVp-p. Measured at 20 MHz bandwidth using a 12-inch twisted pair terminated by parallel 0.1 µF and 47 µF capacitors. Charging and buffering have different voltage ranges. All three tabulated buffering cases apply to this same complete model; they are operating points, not separate output-channel or power-supply variants. Mode Selector and Status Indication Fixed mode — factory setting With the switch at Fix 22Vdc, buffering starts when terminal voltage falls below 22 VDC. Dynamic mode With the switch at Vin−1Vdc, buffering starts when the input terminal voltage decreases by 1 VDC. LED continuously on Ready: the capacitors are fully charged. LED off The capacitors are discharged. LED flashing at 1 Hz The capacitors are charging. LED flashing at 10 Hz The module is buffering and its capacitors are discharging. The operating diagram shows charging, standby and buffer states separately. After the upstream supply loses AC input, its own hold-up interval precedes the module’s illustrated buffering interval. Control and Monitoring Signals Signal supply +Vs 10–35 VDC / 10 mA as specified. Supply +Vs from the module’s +V or from an external voltage source using the corresponding application wiring. Inhibit input I Buffer module ON when +Vs−V(I) <6 VDC; buffer module OFF when +Vs−V(I) >10 VDC. Maximum: 35 VDC / 4 mA. The intermediate region is not assigned a guaranteed state. Ready output R Charged-ready state: V(R) >+Vs−2 VDC. Unready state: V(R) <1 VDC. Maximum: 35 VDC / 10 mA. Buffering output B Buffering state: V(B) >+Vs−2 VDC. Other modes: V(B) <1 VDC. Maximum: 35 VDC / 10 mA. Signal interface The block and signal diagrams show optocouplers for I, R and B. These monitoring outputs are not specified as potential-free relay contacts. Follow the complete application circuit for signal return paths, external indicators or relay loads and the inhibit switch. The diagrams show both a signal supply taken from the DC rail and a separate external signal supply; do not substitute an AC connection at these signal terminals. Protection Overvoltage 31–37.5 V: output-voltage shutdown. Overload in buffer mode 105–125% of rated output power as specified; output-voltage shutdown, re-power to recover. This is a protection threshold, not an additional continuous-output rating. Short circuit Output-voltage shutdown; re-power to recover. Reverse polarity Internal MOSFET protection; automatic recovery after the fault is removed. Signal TVS rating 35 V maximum, as listed in the protection table. Use the charging, buffer and signal-terminal limits for their respective circuits. Protection does not replace correct polarity, wiring or load sizing. Connection and Parallel Applications Main DC wiring Connect the regulated DC supply, load and buffer module to the same DC rails with the polarities shown in the general wiring diagram. The module’s main terminals are +V and −V; there are no AC L/N input terminals on this module. Parallel buffer units The catalogue allows parallel buffer modules to increase output capacity or extend buffering time and provides a two-unit example. Follow the illustrated main-rail and signal wiring for each unit. Parallel selection limits The assigned catalogue pages do not state a numerical maximum unit count or a guaranteed combined buffer-time formula. Keep each unit within its own ratings and size the upstream supply for charging demand as well as the load. External application components The diagrams show a power supply, load, Ready/Buffering relay or signal loads, an inhibit switch and an optional external signal-voltage source. Complete order codes and included quantities for these external items are not specified. The illustrated application parts are not a promise that relays, indicators, switches or another power supply are supplied with the DBUF20-24. Cooling and Environment Cooling / working temperature Free-air convection; −25 to +75°C. The vertical-installation load curve shows 100% through this range, subject to the other catalogue conditions. Working humidity 5–95% RH, non-condensing. Storage temperature −25 to +80°C. Temperature coefficient ±0.03%/°C over 0–75°C. Operating altitude Up to 5,000 m; overvoltage category II. Above 2,000 m, reduce the permissible ambient temperature by 3.5°C per 1,000 m for this fanless design. Shock test IEC60068-2-27; 30 G (300 m/s²), 18 ms, one time per direction and two times in total as listed. Vibration Component: 10–500 Hz, 2 G, 10 minutes per cycle, 60 minutes each along X, Y and Z. Mounting clip: compliance with IEC60068-2-6. Apply the installation orientation, altitude and DC operating limits together; the ambient-temperature endpoint does not remove the finite-energy buffering limit. Dimensions, Terminals and Mounting Dimensions, W × H × D 63 × 125.2 × 114.9 mm; drawing tolerance ±1 mm; case 979E. TB1 main terminals Pins 1 and 2: DC +V. Pins 3 and 4: DC −V. TB2 signal terminals Pin 1: FG; pin 2: Inhibit (I); pin 3: Ready (R); pin 4: Buffering (B); pin 5: supply voltage (+Vs). Front elements The main terminal block, mode selector and status LED are above the lower signal terminal block, as shown in the mechanical drawing. DIN rail Fits TS35/7.5 or TS35/15. The rail illustrated is for reference and is not included with the unit. Mount vertically and follow the supplied installation instructions. The catalogue does not specify terminal torque, conductor size or a separate complete mounting-accessory order code in these assigned pages; select and install these items using the applicable installation documentation. Safety, EMC and Measurement Conditions Safety approvals IEC62368-1 and UL62368-1 are listed as approved. Withstand voltage Combined input/output circuit to FG: 2.2 kVDC; signals to FG: 2.2 kVDC. No input-to-output isolation rating is inferred. Isolation resistance Greater than 100 MΩ for input/output-to-FG and signals-to-FG, tested at 500 VDC, 25°C and 70% RH. EMC emissions Conducted and radiated emissions: BS EN/EN55032 Class B. No harmonic-current or flicker test level is listed for this DC buffer module. EMC immunity framework BS EN/EN55035 and BS EN/EN61000-6-2. The following listed tests use criterion A. ESD / radiated immunity BS EN/EN61000-4-2: 15 kV air and 8 kV contact discharge. BS EN/EN61000-4-3: 10 V/m. EFT / surge immunity BS EN/EN61000-4-4: 2 kV. BS EN/EN61000-4-5: 1 kV line-to-line and 2 kV line-to-FG. Conducted / magnetic-field immunity BS EN/EN61000-4-6: 10 V. BS EN/EN61000-4-8: 30 A/m. Default measurement conditions Unless stated otherwise: normal input, rated load and 25°C ambient. Reconfirm compliance of the completed equipment and the whole system with the applicable EMC requirements. Weight and Reliability Single-unit catalogue weight 1,062 g (1.062 kg), explicitly stated in the PACKING entry. This is a single-unit catalogue reference, not a shipping-package weight or measured net-weight claim. Packing reference 12 pieces / 12.8 kg / 0.74 CUFT. MTBF estimates at 25°C 164.8 thousand hours minimum by MIL-HDBK-217F; 1,510.0 thousand hours minimum by Telcordia TR/SR-332 (Bellcore). MTBF estimates at 40°C 108.6 thousand hours minimum by MIL-HDBK-217F; 765.8 thousand hours minimum by Telcordia TR/SR-332 (Bellcore). Catalogue warranty The catalogue lists a 3-year manufacturer warranty, subject to the applicable terms. MTBF figures are statistical estimates under the named methods, not guaranteed service life.

Read more less

MEAN WELL DBUF20-24 is a DIN rail electrolytic-capacitor buffer module for regulated 24 VDC systems, with a maximum buffer output current of 20 A. At 22 VDC and 20 A it provides 350 ms typical and 250 ms minimum buffering. It supports selectable fixed or dynamic trigger thresholds and status monitoring; duration depends on the load and operating conditions. Product Datasheet Download MEAN WELL DBUF20 Datasheet (PDF) The DBUF20 section is on PDF pages 1, 2, 3, 4, 5, 6, 7. Refer to the complete mechanical drawings and notes when planning installation. Model and Operating Principle Complete model DBUF20-24 Product type DIN rail buffer module for a regulated 24 VDC power supply. Energy is stored in electrolytic capacitors instead of lead-acid batteries. Model code DBUF identifies the DIN rail buffer family; 20 is the 20 A maximum buffer output; 24 is the nominal system voltage. Use Supplementary short-duration support for industrial controls, semiconductor fabrication equipment, factory automation and electromechanical apparatus. The module charges from an existing DC supply and releases stored energy when the selected voltage threshold is reached. It is not an AC-input power supply or a battery UPS with unlimited hold-up time. Charging and DC Buffer Ratings Nominal system voltage 24 VDC. Charging voltage 23–30 VDC. Charging / standby current 900 mA maximum during charging; 100 mA maximum in standby. Allow for this additional demand when sizing the upstream supply. Charging time 15 s typical; 25 s maximum. Buffer operating range 22–29 VDC. Fixed mode uses 22 VDC; dynamic mode follows the Vin−1 V setting described below. Maximum buffer current 20 A per DBUF20-24, subject to the finite buffering time and installation conditions. Buffer time at 20 A At 22 VDC: 350 ms typical; 250 ms minimum. Buffer time at 10 A At 22 VDC: 700 ms typical; 500 ms minimum. Buffer time at 0.1 A At 22 VDC: 45 s typical; 30 s minimum. Additional curve reference The typical 22 VDC buffering curve marks approximately 1.4 s at 5 A. Use the complete curve for intermediate loads; do not treat a typical curve value as a guaranteed minimum. Ripple and noise, maximum 200 mVp-p. Measured at 20 MHz bandwidth using a 12-inch twisted pair terminated by parallel 0.1 µF and 47 µF capacitors. Charging and buffering have different voltage ranges. All three tabulated buffering cases apply to this same complete model; they are operating points, not separate output-channel or power-supply variants. Mode Selector and Status Indication Fixed mode — factory setting With the switch at Fix 22Vdc, buffering starts when terminal voltage falls below 22 VDC. Dynamic mode With the switch at Vin−1Vdc, buffering starts when the input terminal voltage decreases by 1 VDC. LED continuously on Ready: the capacitors are fully charged. LED off The capacitors are discharged. LED flashing at 1 Hz The capacitors are charging. LED flashing at 10 Hz The module is buffering and its capacitors are discharging. The operating diagram shows charging, standby and buffer states separately. After the upstream supply loses AC input, its own hold-up interval precedes the module’s illustrated buffering interval. Control and Monitoring Signals Signal supply +Vs 10–35 VDC / 10 mA as specified. Supply +Vs from the module’s +V or from an external voltage source using the corresponding application wiring. Inhibit input I Buffer module ON when +Vs−V(I) <6 VDC; buffer module OFF when +Vs−V(I) >10 VDC. Maximum: 35 VDC / 4 mA. The intermediate region is not assigned a guaranteed state. Ready output R Charged-ready state: V(R) >+Vs−2 VDC. Unready state: V(R) <1 VDC. Maximum: 35 VDC / 10 mA. Buffering output B Buffering state: V(B) >+Vs−2 VDC. Other modes: V(B) <1 VDC. Maximum: 35 VDC / 10 mA. Signal interface The block and signal diagrams show optocouplers for I, R and B. These monitoring outputs are not specified as potential-free relay contacts. Follow the complete application circuit for signal return paths, external indicators or relay loads and the inhibit switch. The diagrams show both a signal supply taken from the DC rail and a separate external signal supply; do not substitute an AC connection at these signal terminals. Protection Overvoltage 31–37.5 V: output-voltage shutdown. Overload in buffer mode 105–125% of rated output power as specified; output-voltage shutdown, re-power to recover. This is a protection threshold, not an additional continuous-output rating. Short circuit Output-voltage shutdown; re-power to recover. Reverse polarity Internal MOSFET protection; automatic recovery after the fault is removed. Signal TVS rating 35 V maximum, as listed in the protection table. Use the charging, buffer and signal-terminal limits for their respective circuits. Protection does not replace correct polarity, wiring or load sizing. Connection and Parallel Applications Main DC wiring Connect the regulated DC supply, load and buffer module to the same DC rails with the polarities shown in the general wiring diagram. The module’s main terminals are +V and −V; there are no AC L/N input terminals on this module. Parallel buffer units The catalogue allows parallel buffer modules to increase output capacity or extend buffering time and provides a two-unit example. Follow the illustrated main-rail and signal wiring for each unit. Parallel selection limits The assigned catalogue pages do not state a numerical maximum unit count or a guaranteed combined buffer-time formula. Keep each unit within its own ratings and size the upstream supply for charging demand as well as the load. External application components The diagrams show a power supply, load, Ready/Buffering relay or signal loads, an inhibit switch and an optional external signal-voltage source. Complete order codes and included quantities for these external items are not specified. The illustrated application parts are not a promise that relays, indicators, switches or another power supply are supplied with the DBUF20-24. Cooling and Environment Cooling / working temperature Free-air convection; −25 to +75°C. The vertical-installation load curve shows 100% through this range, subject to the other catalogue conditions. Working humidity 5–95% RH, non-condensing. Storage temperature −25 to +80°C. Temperature coefficient ±0.03%/°C over 0–75°C. Operating altitude Up to 5,000 m; overvoltage category II. Above 2,000 m, reduce the permissible ambient temperature by 3.5°C per 1,000 m for this fanless design. Shock test IEC60068-2-27; 30 G (300 m/s²), 18 ms, one time per direction and two times in total as listed. Vibration Component: 10–500 Hz, 2 G, 10 minutes per cycle, 60 minutes each along X, Y and Z. Mounting clip: compliance with IEC60068-2-6. Apply the installation orientation, altitude and DC operating limits together; the ambient-temperature endpoint does not remove the finite-energy buffering limit. Dimensions, Terminals and Mounting Dimensions, W × H × D 63 × 125.2 × 114.9 mm; drawing tolerance ±1 mm; case 979E. TB1 main terminals Pins 1 and 2: DC +V. Pins 3 and 4: DC −V. TB2 signal terminals Pin 1: FG; pin 2: Inhibit (I); pin 3: Ready (R); pin 4: Buffering (B); pin 5: supply voltage (+Vs). Front elements The main terminal block, mode selector and status LED are above the lower signal terminal block, as shown in the mechanical drawing. DIN rail Fits TS35/7.5 or TS35/15. The rail illustrated is for reference and is not included with the unit. Mount vertically and follow the supplied installation instructions. The catalogue does not specify terminal torque, conductor size or a separate complete mounting-accessory order code in these assigned pages; select and install these items using the applicable installation documentation. Safety, EMC and Measurement Conditions Safety approvals IEC62368-1 and UL62368-1 are listed as approved. Withstand voltage Combined input/output circuit to FG: 2.2 kVDC; signals to FG: 2.2 kVDC. No input-to-output isolation rating is inferred. Isolation resistance Greater than 100 MΩ for input/output-to-FG and signals-to-FG, tested at 500 VDC, 25°C and 70% RH. EMC emissions Conducted and radiated emissions: BS EN/EN55032 Class B. No harmonic-current or flicker test level is listed for this DC buffer module. EMC immunity framework BS EN/EN55035 and BS EN/EN61000-6-2. The following listed tests use criterion A. ESD / radiated immunity BS EN/EN61000-4-2: 15 kV air and 8 kV contact discharge. BS EN/EN61000-4-3: 10 V/m. EFT / surge immunity BS EN/EN61000-4-4: 2 kV. BS EN/EN61000-4-5: 1 kV line-to-line and 2 kV line-to-FG. Conducted / magnetic-field immunity BS EN/EN61000-4-6: 10 V. BS EN/EN61000-4-8: 30 A/m. Default measurement conditions Unless stated otherwise: normal input, rated load and 25°C ambient. Reconfirm compliance of the completed equipment and the whole system with the applicable EMC requirements. Weight and Reliability Single-unit catalogue weight 1,062 g (1.062 kg), explicitly stated in the PACKING entry. This is a single-unit catalogue reference, not a shipping-package weight or measured net-weight claim. Packing reference 12 pieces / 12.8 kg / 0.74 CUFT. MTBF estimates at 25°C 164.8 thousand hours minimum by MIL-HDBK-217F; 1,510.0 thousand hours minimum by Telcordia TR/SR-332 (Bellcore). MTBF estimates at 40°C 108.6 thousand hours minimum by MIL-HDBK-217F; 765.8 thousand hours minimum by Telcordia TR/SR-332 (Bellcore). Catalogue warranty The catalogue lists a 3-year manufacturer warranty, subject to the applicable terms. MTBF figures are statistical estimates under the named methods, not guaranteed service life.

Read more less