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Supermicro 1200W 1U Redundant Power Supply (PWS-1K21P-1R)

  • PMBus 1.2 Support for Remote Management
  • Optimized for 1U Server
  • 80 Plus Gold
  • Supermicro Certified
  • Replaced by: PWS-1K23A-1R 
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The Supermicro PWS-1K21P-1R is an 80 Plus Gold power supply capable of supplying 1200W output power at 92% efficiency. Enjoy the simplicity of active power factor correction (PFC) and automatically correct AC input for a full range of voltages. Features a card edge connector for connection with the backplane of compatible Supermicro 1U systems. This power supply is designed to not only provide you reliable power to your Supermicro server but also protects it from over voltage, over current and short circuiting via protective circuitry embedded into the unit. Rest easy knowing your hardware will be up and running with a mean-time between failure (MTBF) of greater than 150,000 hours and an LED indicator to keep you informed on normal/abnormal conditions for your PSU. This power supply is redundant to safe-guard your system from power failure and allows for hot-swap replacement to eliminate system downtime. All materials contained comply with RoHS requirements and is certified by Supermicro.
More Information
Total Power Output1000W / 1200W
Type of Power SupplyPower Supply
Form Factor1U
Dimension (W x H x L)76 x 40.4 x 336 mm
+5V N/A
+12V1000W: 100-140V: 83A; 1200W:180-240: 100A
5V Standby90 to 264Vac: 4.0 / 4.0A
Input Voltage Range1000W: 100-140V; 1200W: 180-240V
Input Frequency Range50-60Hz
Input Current Range1000W: 11.5-8A; 1200W: 8.5-5A
Output TypeGold Finger
8Pin / 4Pin (12V) ConnectorN/A
Voltage / CurrentYes
Energy Efficiency92% Peak
80 Plus Certification80 Plus Gold
Validated SystemsSSG-2026T-DE2R24L
Validated ChassisCSE-216E26-R1200LPB, CSE-745TQ-R1200B, CSE-826E16-R1200LPB, CSE-836A-R1200B, CSE-836E16-R1200B, CSE-836E26-R1200B, CSE-846A-R1200B, CSE-846E16-R1200B, CSE-846E26-R1200B, CSE-846TQ-R1200B
Warranty1 year warranty
Product Environmental ComplianceRoHS and REACH compliant, details available upon request
PWS-1K21P-1R Spec Sheet PDF December 2018
PWS-1K21P-1R 80 PLUS Test Report PDF April 2009

This product can expose you to chemicals including lead, known to the State of California to cause cancer and birth defects or other reproductive harm. For more information, go to