Supermicro PWS-406P-1R 400W server power supply

400W redundant server supply

The Supermicro PWS-406P-1R is a 400W hot-swap power module built for 1U and 2U rackmount servers. It delivers +12V at 33A plus a 5V standby rail at 3A through a single 24-pin main connector. The unit carries 80 Plus certification and active PFC for efficient AC-to-DC conversion in always-on environments.

Redundant form factor and cabling

At 8.66" x 1.97" x 1.57" the supply slides into a standard redundant bay and locks with a thumbscrew, letting technicians swap units without tools or downtime. The 24-pin output mates directly to compatible Supermicro backplanes, so no adapter cables are required. Active PFC and 80 Plus rating reduce waste heat, easing cooling load in dense racks.

Replaces failed or capacity-constrained modules

This unit restores full redundancy when an identical module fails or when a lower-wattage supply can no longer support added drives or CPU upgrades. The jump is worth it when the chassis already accepts the PWS-406P-1R form factor and the 400W ceiling matches the new load calculation. Servers needing higher output or a different connector layout cannot use this module.