550W Server Power Supply DH550E-S0 / DPS-550NB A / AC550E-S0 — Compatible with R420 R320 (4XX1H J6J6M)

Replacement 550W server power supply compatible with model numbers DH550E-S0, DPS-550NB A and AC550E-S0. Built to work with Dell R420 and R320 rack servers and matches part identifiers 4XX1H and J6J6M. Use this unit to restore power functionality in supported systems—confirm your server part number before purchase to ensure compatibility.