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Silver rectangular rack-mountable redundant server power supply unit

Supermicro

Supermicro PWS-1K21P-1RProduct 1200W redundant server power supply

SKU CH-SG5W-P6702 MPN PWS-1K21P-1RProduct

Redundant 1200 W server power supply with 91.1 % efficiency and 80 Plus certification

  • Max wattage1200 W
  • Main power connector24Pin
  • Output current+12 V@83/100A, +5VSB@4A
  • Product typeRedundant Power Supply
  • 1200 W output powers demanding server workloads
  • Redundant design maintains uptime if a module fails
  • 1 % efficiency cuts energy waste and heat
  • Wide 110 V to 220 V AC input suits global deployments
  • Rack-mountable form factor simplifies data-centre integration

1200W redundant server power supply

The Supermicro PWS-1K21P-1R delivers up to 1200W of AC power in a rack-mountable form factor. It operates at 91.1% efficiency and meets 80 Plus certification. The unit supports 110 V AC and 220 V AC input ranges. It is built for enterprise server deployments requiring high availability.

Check existing setup

Verify that your chassis accepts this specific redundant form factor and provides the correct backplane connections. Confirm the 24Pin main connector matches your motherboard power input. Ensure the +12V rail capacity of 83A or 100A aligns with your component load. The +5VSB rail supplies up to 4A for standby functions.

Suits high-density rack servers

This unit suits administrators running redundant power configurations in compatible Supermicro rack systems. It is not for desktop PC builds or enclosures lacking a redundant power bay. Buyers needing non-redundant ATX supplies or different wattage ratings should look at other form factors.

How it compares

Measured against everything we stock in Server & Hot-Plug PSUs, at today’s prices. Recalculated every night.

Price $44.99
Cheaper than about 88% of the 3,798 comparable items (median $131.99).
Max wattage 1200 W
Higher than about 80% of the 235 comparable items (median 668 W).

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Specifications

Product
Brand nameSuperMicro
Product line80 Plus
Product typeRedundant Power Supply
Power
Max wattage1200 W
Main power connector24Pin
Output current+12 V@83/100A, +5VSB@4A

Questions about this item

Does the PWS-1K21P-1R come with the redundant frame and power cables, or must I buy them separately?

The unit is a redundant AC power supply module with a 24-pin main connector; the rack-mountable redundant frame and AC power cords are sold separately.

Should I choose the 110 V or 220 V input version for my rack?

The supply auto-ranges across 110 V AC and 220 V AC, so a single model covers both input voltages.

What does the 1200 W rating mean for actual +12 V delivery in my server?

The +12 V rail provides up to 83 A at 110 V input and 100 A at 220 V input, giving the full 1200 W only on the higher voltage.

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