Product

Dell 550W Server Power Supply M95X4 | PowerEdge R320 / R420 (Hot-Swap / Redundant)

Key Features

• New original Dell 550W hot-swap server power supply for PowerEdge R320 and R420 rack servers
• Dell part numbers: M95X4
• PSU model numbers: L550E-S0
• Hot-plug / hot-swap capable — PSU can be replaced without server downtime
• Redundant N+1 dual-PSU configuration supported
• 550W stable output for PowerEdge R320 / R420 rack server workloads
• Wide input range: 100–240V AC, 50–60Hz — compatible with MY/SG 240V supply
• Built-in OVP / OCP / SCP protection

Technical Specifications

Compatible Models

Dell PowerEdge Server Series:

• Dell PowerEdge R320
• Dell PowerEdge R420

⚠️ Always verify the part number / model number on your existing PSU label before purchasing.

Package Contents

• 1× Dell 550W Server PSU M95X4 PowerEdge R320 R420 (New Original or identical DPN)

Warranty

• 3-month replacement warranty
• Covers manufacturing defects; physical damage and improper installation not included

Additional Notes

• Hot-swap server PSU — can be swapped while server is running (when redundant PSU is active).
• Enterprise rack server use only — not compatible with desktop or workstation chassis.
• Verify Dell DP/N on existing PSU label matches M95X4 before ordering.
• New original unit — genuine factory Dell unit, not refurbished or aftermarket.