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Rectangular metal power supply unit with screw terminals and ventilation slots

myVolts

myVolts AC-DC Switching Power Supply 12V 33A 400W

SKU CH-B6WB-1KNP3

Converts AC 110 V or 240 V to 12 V DC at 33 A with built-in over-voltage, over-current and short-circuit protection

  • Product typeAT
  • Delivers stable 12 V DC at 33 A for 400 W loads
  • Accepts worldwide AC 110 V to 240 V input without manual switching
  • Metal enclosure dissipates heat for reliable indoor operation
  • Built-in over-voltage, over-current and short-circuit protection safeguards connected equipment
  • Certified to CCC, RoHS and CE safety standards

12 V 33 A 400 W Industrial Supply

This AC-DC switching unit converts 110 V or 240 V mains to a regulated 12 V DC output rated at 33 A and 400 W. It is built for indoor equipment that demands steady 12 V power such as LED lighting systems, CCTV installations, or bench test rigs. The metal enclosure aids heat dissipation in continuous-duty applications.

Replacing Lower-Current 12 V Units

The supply steps up from 12 V models rated at 1 A through 30 A when the load exceeds those limits. The jump is worth it when your total 12 V draw approaches 33 A or when you need the 400 W headroom for peak transients. It also supersedes any 12 V brick that lacks built-in over-voltage, over-current and short-circuit protection.

Check Mains Voltage and Mounting Space

Verify that your local mains falls within the 110 V / 220 V ±15 % range before wiring the unit. Confirm the chassis dimensions of 200 mm by 100 mm by 45 mm fit your enclosure and allow airflow for the 0 °C to 40 °C operating window. Ensure the installation stays indoors and humidity remains below 95 % non-condensing.

How it compares

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

Price $65.99
Cheaper than about 81% of the 10,869 comparable items (median $142.99).

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Specifications

Product
Product typeAT

Questions about this item

What clearance do I need for the 200 mm by 100 mm by 45 mm metal case?

The 12 V 33 A unit measures 200 mm long, 100 mm wide and 45 mm high, so allow at least that footprint plus room for cable bends and airflow around the aluminium shell.

Which step do installers most often miss when wiring the AC 110 V/220 V input and the DC 12 V output terminals?

Many forget to verify the selector switch matches the local mains voltage before tightening the input screws, then skip the output polarity check that prevents reverse-voltage damage.

How do I know when the built-in over-voltage, over-current or short-circuit protection has tripped and the unit needs replacement?

If the supply latches off and will not restart after the fault is cleared and AC power is cycled, the internal protection circuit has likely failed and the whole unit must be replaced.

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