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DBUF20/40 20A/40A DIN Rail Buffer Modules

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DBUF20/40 20A/40A DIN Rail Buffer Modules
Issue Time:2020-01-02

The DBUF20/40 can provide similar functions as the DR-UPS40 uninterrupted power backup function. The main feature of the DBUF20/40 is to provide a short buffer time through the internal electrolytic capacitor energy storage. There is no external battery in the system, and the system maintenance costs reduce significantly since no battery replacement is needed. On the other hand, the DC-UPS40 requires an external battery. The backup time can be longer, but the battery needs to be replaced regularly. After the launch of the DBUF20/40 series, MEAN WELL's DIN rail power solutions have been completed, as MEAN WELL can now provide 10~960W DIN rail power supplies and various peripheral accessory modules in one-stop-shop!


  • Buffering with electrolytic capacitors instead of batteries, saves maintenance cost
  • Suitable for 24Vdc systems
  • Buffering time:
    • DBUF20: 350ms at 20A load
    • DBUF40: 250ms at 40A load
  • Buffer mode selectable by switch:
    • 22Vdc (fixed, default setting)
    • Vin-1Vdc (dynamic mode)
  • Supports parallel connection of multiple DBUF20/40 to extend buffering time
  • Operating temperature: -25~+70℃
  • LED indicator for operation status
  • Protections: short circuit/overload/over voltage/reverse polarity (no damage)
  • Class I installation available (includes grounding pin)
  • Passes CB/UL/CUL/EAC//CE international safety approval
  • Dimensions (WxHxD): 63 x 125.2 x 114.9 mm
  • 3 years warranty

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