Delta DPS-250AB-44D 250W Flex ATX Power Supply — Replacement PSU for NAS, Servers and Compact Systems

The correct Delta 250W Flex supply to restore a NAS or compact server.

The Delta DPS-250AB-44D is a 250W 1U/Flex ATX power supply used in NAS devices, compact servers and small-form-factor systems. It accepts 100–240V AC input and provides ATX motherboard and drive power. It suits IT administrators and repair shops replacing a failed Delta supply in storage and server equipment.

Getting a NAS Back Online After a Power Supply Failure

In a NAS or compact server, a failed power supply takes all the stored data offline, even though the drives are fine. Waiting for a model-specific part from the original vendor can take days.

The DPS-250AB-44D is the Delta unit used in many of these systems. It fits the same narrow Flex/1U opening and connects to the existing motherboard and drive cables, so the array comes back online as soon as the swap is done.

Compact Flex Form Factor

The narrow 1U/Flex housing fits NAS enclosures and short-depth rackmount chassis where standard ATX supplies do not fit. Mounting points match the original Delta unit.

Stable Power for Drives and Boards

A 250W rating covers multi-drive NAS units and low-power server boards with headroom for drive spin-up. Universal input supports office and data center power worldwide.

Setup Instructions

How to Replace the Delta DPS-250AB-44D

1. Shut down the NAS or server, unplug the AC cord and press the power button for a few seconds to drain residual power.
2. Open the side panel, photograph the cable routing, then disconnect the power cables from the motherboard, drives and any graphics card.
3. Remove the mounting screws or release latch, take out the old unit and install the replacement in the same position.
4. Reconnect every cable, close the case, plug in the AC cord and power on to confirm the system boots and the fan spins.