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Rectangular metal power supply unit with built-in fan and terminal connections

Mean Well

Mean Well QP-320D 5V +/-12V 24V 316W Quad Output AT Power Supply

SKU CH-W4MM-895VZ

Quad-output AT power supply delivering 5V, ±12V and 24V rails with built-in active PFC and forced-air cooling for 316W continuous load

  • Product typeAT
  • Universal AC input accepts mains worldwide
  • Active PFC function improves power factor efficiency
  • Quad output rails deliver 5V, ±12V and 24V simultaneously
  • Multiple protections guard against short circuit, overload, over voltage and over temperature
  • Forced air cooling with built-in DC fan handles up to 316W continuous load

Quad-output AT supply for industrial systems

The Mean Well QP-320D delivers four regulated rails at 5V, ±12V and 24V from a single AT-form-factor chassis. It suits equipment that still relies on legacy AT wiring rather than modern ATX connectors. Builders maintaining older automation rigs or test benches will find the pin-out familiar and the 316 W combined rating adequate for mixed digital and analogue loads.

Active PFC and tiered cooling reduce integration

Built-in active power-factor correction meets harmonic-current limits without external components. Below 100 W the unit runs by free-air convection; between 150 W and 320 W a built-in DC fan provides forced airflow. Over-temperature protection triggers in the 200–320 W range, with optional lower thresholds at 100 W and 150 W for tighter thermal margins.

316 W total with defined rail limits

The 5 V rail supplies up to 20 A, ±12 V rails deliver 3 A each and the 24 V rail provides 10 A. Continuous operation at all four maximums simultaneously stays within the 316 W envelope. Loads that demand more than 10 A on the 24 V line or more than 20 A on the 5 V line will exceed the rated headroom and require a higher-capacity supply.

How it compares

Measured against everything we stock in ATX Desktop Power Supplies, at today’s prices. Recalculated every night.

Price $300.99
Pricier than about 77% of the 10,869 comparable items (median $142.99).

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Specifications

Product
Product typeAT

Questions about this item

How often will the built-in DC fan need cleaning or replacement under continuous load?

The built-in DC fan provides forced air cooling for the 316W output; dust accumulation over time can reduce airflow, so periodic cleaning with compressed air is recommended and the fan itself is a standard replaceable component if bearings wear out.

Which protection circuit activates first during prolonged maximum-load operation?

Over-temperature protection engages between 200W and 320W, so sustained loads near 316W will trigger thermal shutdown before overload or over-voltage limits are reached.

What is the typical noise level and heat output when the supply runs at full 316W all day?

Forced air cooling by the built-in DC fan operates continuously at 316W, producing audible fan noise and exhausting heat equivalent to the supply's losses at full load.

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