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Supermicro PWS-521-1H 1U server power supply, silver metal enclosure, rear fan grille, 24-pin connector visible

Supermicro

Supermicro PWS-521-1H 520W 1U server power supply

SKU CH-E8ER-P8CDN MPN PWS-521-1H

1U server power supply delivering 520 W through a 24-pin connector with +12 V at 39 A, +5 V at 20 A, +3.3 V at 16 A and +5 VSB at 3 A

  • Max wattage520 W
  • Main power connector24Pin
  • Output current+12 V@39A, +5 V@20A, +3.3 V@16A, +5VSB@3A
  • Product dimensions9.45 in × 3.94 in × 1.57 in
  • Product weight3.3 lb (1.5 kg)
  • 520 W output powers dense 1U servers
  • 24-pin main connector fits standard server boards
  • +12 V rail delivers 39 A for CPU loads
  • +5 V and +3.3 V rails supply 20 A and 16 A for peripherals
  • Compact 9.45" × 3.94" × 1.57" form factor saves rack space

520W 1U server power supply

The Supermicro PWS-521-1H delivers 520W in a 1U form factor for rack-mount servers. It provides multi-output rails including +12V at 39A, +5V at 20A, +3.3V at 16A and +5VSB at 3A. A 24Pin main connector feeds the motherboard directly. This unit suits administrators refreshing or repairing compatible Supermicro chassis. It is not for builders needing ATX dimensions, higher wattage or modular cabling.

Thermals noise and power draw

The supply fits a 9.45" x 3.94" x 1.57" enclosure weighing 3.3 lbs, matching standard 1U server bays. Internal fans draw cool air through the chassis front and exhaust at the rear under system fan control. Acoustic output varies with server load and chassis fan curves rather than the supply alone. Power conversion follows the rated rail limits without extra headroom beyond 520W.

Bundled accessories and software

The unit ships as a standalone power supply module without cables, rails or mounting screws. No configuration utility, monitoring agent or firmware tool is included in the package. Server management features such as IPMI sensor reading depend on the host platform BMC and chassis wiring. Administrators must source any required power cables or mounting hardware separately.

How it compares

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

Price $72.99
Cheaper than about 79% of the 3,798 comparable items (median $131.99).
Max wattage 520 W
Lower than about 59% of the 235 comparable items (median 668 W).

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Specifications

Product
Brand nameSuperMicro
Model namePWS-521-1H
Power
Max wattage520 W
Main power connector24Pin
Output current+12 V@39A, +5 V@20A, +3.3 V@16A, +5VSB@3A
Size & build
Product dimensions9.45 in × 3.94 in × 1.57 in
Product weight3.3 lb (1.5 kg)
Shipping weight1.81 kg
Package size254 × 152 × 51 mm

Questions about this item

How do I install the 24Pin main connector into a 1U chassis?

Align the 24Pin connector with the motherboard socket, press firmly until the latch clicks, then secure the 9.45" x 3.94" x 1.57" unit with the chassis screws; the step often missed is fully seating the latch before tightening screws.

What maintenance will the PWS-521-1H need over time?

Periodically clear dust from the intake and exhaust vents with compressed air while the server is powered off; no user-serviceable parts are inside, so replacement is only required if the unit fails to deliver its rated outputs.

Which rail hits its limit first during sustained full-load operation?

The +12V rail is rated at 39A and carries the bulk of modern server power draw, so it reaches its maximum contribution before the +5V 20A, +3.3V 16A or +5VSB 3A rails.

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