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Silver rectangular 1U server PSU with modular cable ports and fan grille

Seasonic

Seasonic SS-500L1U 500W server power supply

SKU CH-WCBW-N7BHW MPN SS-500L1U

Delivers 500 W EPS12V power with Active PFC and modular cables for single-server builds

  • Max wattage500 W
  • Power efficiency> 87%
  • Power supply redundancySingle
  • Output type+3.3 V@20A, +5 V@20A, +12 V Combined@40A
  • AC input frequency47–63 Hz
  • Mean time between failures>100,000 h
  • 500W output powers demanding server workloads
  • 87% efficiency reduces energy waste and heat
  • 100,000 hour MTBF indicates long service life
  • Active PFC 99% typical improves power quality
  • Compact 1U form factor fits dense rack deployments

Server power supply for 1U rack builds

The Seasonic SS-500L1U is a new 500W EPS12V unit built for single 1U server installations. It delivers +12V at 40A with +3.3V and +5V each at 20A for balanced rail loading. Active PFC and a DC-to-DC converter design keep efficiency above 87 percent at typical loads.

Practical limits of the EPS12V standard

The form factor measures 235 by 100 by 40mm and fits a single 1U slot with an input range of 47 to 63 Hz. Modular cables are customised for the chassis rather than following a universal pinout, so cable routing must match the server layout. MTBF exceeds 100000 hours with protections for short circuit, over voltage and over power.

Upgrade from lower-efficiency or failed units

Replacing an older supply that lacks 80PLUS Gold certification cuts waste heat and improves rail stability under sustained loads. The jump is worth it when the existing unit shows ripple above one percent or when fan noise becomes intrusive in a quiet rack. Builders needing redundant power or higher wattage should look elsewhere.

How it compares

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

Price $113.99
Cheaper than about 62% of the 3,798 comparable items (median $131.99).
Max wattage 500 W
Lower than about 60% of the 235 comparable items (median 668 W).

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Specifications

Product
Brand nameSeaSonic
Model nameSS-500L1U
Product typeEPS12 V
Ports & slots
Output type+3.3 V@20A, +5 V@20A, +12 V Combined@40A
Power
Max wattage500 W
Power efficiency> 87%
Power supply redundancySingle
AC input frequency47–63 Hz
Built-in protectionShort circuit protection on all outputs
Over voltage protection
Over power protection
Size & build
Product dimensionsL235 × W100 × H40 mm (9.3 in × 3.9 in × 1.6 in)
Shipping weight1.96 kg
Package size257 × 175 × 81 mm
More details
Mean time between failures>100,000 h

Questions about this item

Is this the only capacity available for the SS-500L1U?

The SS-500L1U is offered as a single 500W model with no alternative wattage versions listed.

What does the 500W rating mean for my server build?

It delivers up to 500W total, with the +12V rail supplying a combined 40A for CPU and GPU power.

Does the EPS12V interface limit the 500W output in any way?

The EPS12V design supports the full 500W across all rails, with Active PFC correcting the power factor to 99% typical.

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