MEAN WELL DBUF40-24 Power Supply Accessory, 24 V, 40 A buffer module

Overview

What it is

The MEAN WELL DBUF40-24 is a power supply accessory from the DBUF40 series (24 V/40 A DIN Rail Type Buffer Module), rated 24 V, 40 A buffer module.

What it is used for

Connects to the output of a regulated 24 V DC power supply and stores energy in capacitors, keeping the 24 V load running through short mains dips and interruptions of up to a few hundred milliseconds at full load. MEAN WELL lists applications such as industrial control systems, semiconductor fabrication equipment, factory automation, electro-mechanical apparatus.

Key features

• Buffers with electrolytic capacitors instead of lead acid batteries.
• Typical buffering time 250 ms 40 A.
• Buffer mode selectable by switch: fixed 22 V DC or dynamic Vin minus 1 V DC.
• LED indicator and signal outputs for status.
• Parallel connection supported to extend buffering time.
• Protections: over voltage, overload, short circuit, reverse polarity.

Key Specifications

• Output Voltage: 24 V DC nominal; buffer mode output 22 V DC or Vin minus 1 V DC (selectable), operating range 22 V to 29 V DC.
• Rated Output Current: 40 A max..
• Buffer Time: 250 ms at 40 A; 500 ms at 20 A; 62 s at 0.1 A (typ., at 22 V DC).
• Charging Voltage: 23 V to 30 V DC.
• Operating Temperature: -25 °C to +75 °C (see derating curve).

Buying considerations

Size the unit with headroom above the connected load and check the derating information in the datasheet for high ambient temperature or low input voltage. Other models in the same series are listed on this page.

Installation considerations

MEAN WELL treats this unit as a component of the final equipment, so approvals and EMC performance should be confirmed for the complete installation. Wiring and safety details are in the official datasheet linked below.