Ruth's sister
Ruth's sister R320 R420 550W M95X4 L550E-S0 internal power cable
A 550W redundant server power supply with active PFC for 100-264V input
- Designed for Dell PowerEdge R320 and R420 servers
- Active power factor correction improves electrical efficiency
- Wide 100–264 V input supports global voltage standards
- 550 W redundant output keeps critical workloads running
- Non-modular design simplifies internal cable routing
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.
Highlights
- Designed for Dell PowerEdge R320 and R420 servers
- Active power factor correction improves electrical efficiency
- Wide 100–264 V input supports global voltage standards
- 550 W redundant output keeps critical workloads running
- Non-modular design simplifies internal cable routing
Specifications
No published specifications for this item yet.
Questions about this item
How loud does the 550W redundant unit get under continuous server load?
Active PFC helps the supply run efficiently from 100-264V input, which typically reduces fan speed and heat during all-day operation.
Which motherboard power connectors must my R320 or R420 already provide for this M95X4 supply?
The non-modular design means all cables are fixed; the unit plugs directly into the server's redundant power backplane using the M95X4 interface.
Will this L550E-S0 supply share load cleanly with an older 320W or 420W module still installed in the same chassis?
Yes, the 550W redundant supply is built for hot-swap parallel operation alongside lower-wattage units in compatible Dell PowerEdge systems.
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