Supermicro PWS-1K21P-1R 1200W server power supply

1U rack-mount power supply for high-density servers

This 1U server power supply delivers 1200 W of continuous power in a hot-swappable form factor. It targets administrators running dense compute or storage clusters who need redundant, efficient power without sacrificing rack space. The unit accepts 100 V AC to 240 V AC input and meets 80 Plus Gold efficiency at 91.1 %. It is built for environments where uptime and serviceability are mandatory.

Hot-swap design frees rear chassis space

The rack-mountable housing slides directly into a compatible Supermicro chassis, drawing 8 A at 110 V or 5 A at 220 V. Hot-swap capability lets technicians replace a failed unit without powering down the server, keeping critical workloads online. A single 24-pin main connector supplies the motherboard while the internal backplane distributes +12 V at up to 100 A, +5 V at 30 A, +3.3 V at 24 A and 5 V standby at 4 A.

Replaces fixed non-redundant supplies in 1U nodes

The jump is worth it when a deployment moves from single-supply servers to N+1 redundancy or when efficiency gains at scale lower operating costs. It upgrades installations that currently rely on non-hot-swap units requiring full shutdown for service. Buyers who need DC input, higher wattage per slot or proprietary connector layouts should look elsewhere.