Ruth's sister R320 R420 550W M95X4 L550E-S0 internal power cable

Redundant server power supply

This 550 W unit fits Dell PowerEdge R320 and R420 chassis as a hot-swap redundant module. It delivers active PFC across a 100-264 V input range for worldwide rack deployments. The non-modular cable harness is fixed to the housing. Buyers needing a single non-redundant PSU or a different form factor cannot use this module.

Sustained-load behaviour

Rated for continuous 550 W output in server duty cycles rather than short peaks. Active PFC maintains power-factor stability during prolonged compute workloads. The redundant architecture shares load with a second unit so neither module runs at its thermal limit alone. Systems without a matching redundant bay or backplane cannot take advantage of this design.

Thermals noise and power

Internal 80 mm fan spins to match inlet temperature and combined load across both bays. At typical rack airflow the unit meets its certified efficiency target without audible whine. Power draw at the wall follows the 100-264 V input spec with active correction. Environments lacking forced front-to-rear airflow will see higher fan speeds and temperatures.