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Silver metal rectangular server power supply unit with six small cooling fans on the rear face

TOPOWER

TOPOWER TOP-500SSR4B 500W mini redundant server power supply

SKU CH-NXD5-3NAY7

A redundant 500 W server power supply with two hot-swappable modules, 6 × 40 mm forced-air cooling, and ATX 12 V / EPS 12 V output in a compact 199 × 150 × 86 mm PS/2 form factor

  • Max wattage2 × 500 W
  • Power supply redundancyRedundant
  • Main power connector24Pin
  • Output type500 W x 2
  • Supply voltage100–240 V
  • AC input frequency50/60 Hz
  • Redundant dual 500 W modules keep servers running during a unit failure
  • Hot-swappable design lets you replace a module without shutting down the system
  • Six 38 mm fans deliver forced-air cooling across both power units
  • Compact 199 x 150 x 86 mm PS/2 form factor fits dense rack enclosures
  • MTBF exceeds 100000 hours for long-term reliability in continuous operation

Compact redundant power for 1U servers

The TOPOWER TOP-500SSR4B delivers two hot-swappable 500 W modules in a single PS/2-sized chassis. It targets administrators who need N+1 redundancy without sacrificing a second rack unit. The unit accepts 100–240 V input at 50/60 Hz and complies with IEC 62368-1 safety standards.

Installation fits standard PS/2 bays

The 199 x 150 x 86 mm frame slides into typical server bays and uses a 24-pin main connector. Six 38 mm forced-air fans cool the assembly; fan noise rises quickly under load. Hot-swap trays allow module replacement without tools, but the latch mechanism requires firm pressure to seat correctly. Verify cable routing clearance before closing the chassis door.

Sustained load shares current across modules

Power-sharing circuitry balances output between the two 500 W modules during continuous operation. MTBF exceeds 100,000 hours when both modules share the load evenly. Efficiency remains high across the 12 V and EPS 12 V rails during extended runs. The design is not suited for single-module loads approaching the 500 W limit for long periods.

How it compares

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

Price $460.99
Pricier than about 90% of the 3,798 comparable items (median $131.99).

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Specifications

Product
Brand nameTOPOWER
Model nameTOP-500SSR4B
Product typeRedundant Power Supply
Ports & slots
Output type500 W x 2
Power
Max wattage2 × 500 W
Power supply redundancyRedundant
Main power connector24Pin
Supply voltage100–240 V
AC input frequency50/60 Hz
Size & build
Product dimensions199 × 150 × 86 mm
More details
Fan configuration6 × 38 mm
Mean time between failures>100,000 h

Questions about this item

How can I verify the redundant modules are sharing load correctly after installation?

Check that both hot-swappable modules show active status LEDs and the system reports balanced current draw across the two 500 W outputs.

What comes in the box and what must I source separately?

The unit includes the redundant PS/2-size chassis with six 38 mm fans and a 24-pin main connector; power cables and mounting rails are not included.

Which capacity should I choose for a dual-processor server build?

The model delivers 2 x 500 W total, providing full redundancy at 500 W per module for dual-CPU configurations.

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