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Rectangular metal AT power supply with fan grille and LED indicator

Mean Well

Mean Well EPP-300-12 12V 25A 300W AT power supply

SKU CH-K6CT-TT10H

Delivers 12V at 25A with active PFC, high efficiency up to 94%, and a built-in 12V/0.5A auxiliary output

  • Product typeAT
  • Active PFC function improves power factor efficiency
  • Universal AC full-range input works worldwide
  • High efficiency up to 94 percent reduces waste heat
  • Built-in 12V 0.5A auxiliary output powers peripherals
  • LED power indicator shows status at a glance

Mean Well EPP-300-12 AT power supply

This 300W AT power supply delivers a single 12V output at 25A for industrial or legacy systems that require the older form factor. It includes a built-in active PFC function and universal AC input for worldwide mains compatibility.

300W capacity with 12V auxiliary output

The main rail provides 300W continuous power while a 12V auxiliary output supplies 0.5A for standby or control circuits. Standby 5V delivers 1A with a fan connected or 0.6A without, and no-load consumption stays below 0.5W.

Built-in protections and remote sense

Short-circuit, overload, over-voltage and over-temperature protections safeguard connected equipment. A remote sense function compensates for voltage drop across long cables, and an LED indicator confirms power-on status at a glance.

How it compares

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

Price $132.99
Typical for this category: the median of 10,869 items is $142.99.

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Specifications

Product
Product typeAT

Questions about this item

Will the 12V 25A main output and the 12V 0.5A auxiliary output both power my legacy AT motherboard and ISA cards?

The main 12V 25A rail delivers 300W for the board and expansion cards, while the built-in 12V 0.5A auxiliary output can run a fan or low-draw peripheral without an extra adapter.

How do I confirm the unit is operating correctly once installed?

The front LED lights when the supply is on, and the standby rail provides 5V at 1A with a fan fitted or 0.6A without, letting you verify both main and auxiliary voltages with a multimeter.

Does the package include the AC power cord and mounting screws, or must I source them separately?

The supply itself is supplied new; an IEC mains lead and case mounting hardware are not included and must be purchased separately.

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