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Green open-frame power supply on a 5 by 3 inch PCB

NShi

NShi EPP-400-12 400W 12V server chassis

SKU CH-NC91-NGV68 MPN EPP-400-12

An open-frame 400 W 12 V industrial power supply with 80–264 VAC input, built-in PFC, up to 94 % efficiency and full protection suite

  • Chassis TypeDesktop
  • Delivers 400 W with 25 CFM forced air
  • Runs 250 W silently by free-air convection
  • Accepts 80–264 VAC worldwide with active PFC
  • Peak efficiency reaches 94 % at typical load
  • Built-in protections cover short circuit, overload, over-voltage and over-temperature

Industrial Open-Frame Power Supply

The NShi EPP-400-12 is a 400W industrial open-frame power supply designed for integration into automation machinery, control systems and electronic instruments. It accepts a full-range 80 to 264VAC input and delivers a regulated 12V DC output. The unit suits engineers building Class I or Class II equipment who need a compact, green PCB power solution.

33.3A Peak Current with Forced Air

The single specification that decides fit is the 33.3A rating at 399.6W, which requires 25CFM of forced airflow to reach the full 400W. Without forced air the supply is rated for 20.8A at 249.6W by free convection. Designers must ensure their enclosure provides the stated airflow or accept the lower continuous power limit.

Convection Cooling to 250W and Low Standby Draw

In normal use the supply runs by free air convection up to 250W, moving to 400W only when 25CFM forced air is present. No-load consumption stays below 0.5W and a built-in 12V 0.5A fan output is available for system cooling. The unit operates at altitudes up to 5000 meters with protections for short circuit, overload, over voltage and over temperature.

Highlights

  • Delivers 400 W with 25 CFM forced air
  • Runs 250 W silently by free-air convection
  • Accepts 80–264 VAC worldwide with active PFC
  • Peak efficiency reaches 94 % at typical load
  • Built-in protections cover short circuit, overload, over-voltage and over-temperature

Specifications

Chassis TypeDesktop

Questions about this item

What does the 400W rating actually deliver once the unit is installed in a system?

With 25 CFM of forced airflow the supply provides 33.3 A at 12 V for 399.6 W; relying on natural convection it delivers 20.8 A at 12 V for 249.6 W.

What input voltage range and power-factor correction does the built-in PFC support?

The unit accepts a full-range 80–264 VAC input and includes active PFC for compliance across 110 V and 220 V mains.

What physical space and mounting does the 5 by 3 inch footprint require?

The open-frame PCB measures 5 x 3 inches, fitting a desktop chassis with standard mounting holes for industrial automation or control equipment.

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