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Open-frame power supply PCB with multiple solder points and components

Mean Well

Mean Well PT-45B 42.6W Triple Output Power Supply

SKU CH-3G0S-2FN8Z

Open-frame AC-DC unit delivers 42.6 W across 5 V, 12 V and -12 V rails

  • Product typeAT
  • Triple 5V 12V -12V outputs power mixed-voltage circuits
  • 6 W total capacity runs compact industrial loads
  • CH1 3 A CH2 2 A CH3 .3 A delivers balanced rail current
  • Open-frame PCB design fits standard enclosure footprints
  • 100 % original Mean Well unit verified by serial check

Open-frame triple-output PSU

The Mean Well PT-45B is an open-frame switching supply delivering 42.6 W across three rails. It suits industrial equipment, test benches and legacy AT systems that need 5 V at 3 A, 12 V at 2 A and -12 V at .3 A from a single compact PCB. Builders who need higher wattage or additional voltage rails should look elsewhere.

Simple screw-terminal wiring

Mount the board on standoffs and connect the clearly marked screw terminals to your load. No special tools are required, but the lack of power-factor correction means the unit draws a non-sinusoidal current; verify that your upstream circuit can tolerate the resulting harmonic content. Incorrect polarity on any output will trigger protection and may damage sensitive downstream circuitry.

Check AC input and load balance

Confirm that your mains voltage matches the unit’s rated input range before applying power. Ensure the combined draw on all three outputs stays within the 42.6 W total and that each rail remains within its individual current limit. The -12 V rail is limited to .3 A, so it cannot drive heavy negative-voltage loads.

How it compares

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

Price $40.99
Cheaper than about 92% of the 10,869 comparable items (median $142.99).

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Specifications

Product
Product typeAT

Questions about this item

How can I verify the PT-45B is delivering its rated outputs after installation?

Measure 5 V on channel one, 12 V on channel two and -12 V on channel three with a multimeter under load; the rails should stay within tolerance while drawing up to 3 A, 2 A and .3 A respectively.

What ships with the PT-45B and what must I source separately?

The package includes one PT-45B open-frame unit and a free gift; AC input wiring, output connectors, mounting hardware and any required enclosure are not supplied.

Which PT-45 variant should I choose for a 5 V, 12 V and -12 V triple-rail design?

Select the PT-45B model — it is the only version in the PT-45 series that provides the 5 V / 12 V / -12 V combination at 42.6 W total.

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