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Enclosed metal power supply unit with label showing 12V 4.2A 50.4W

Mean Well

Mean Well NES-50-12 12V 4.2A 50.4W power supply

SKU CH-YHZ5-Y75VZ

Enclosed 50.4 W AC-DC unit delivers 12 V at 4.2 A for low-power systems

  • TypeAT
  • Delivers 12 V at 4.2 A for stable low-power operation
  • 4 W continuous output handles modest loads reliably
  • Enclosed AT-type chassis protects internals from dust and contact
  • Brand-new unit with original Mean Well serial verification
  • Single-output design simplifies wiring in compact builds

Enclosed 12V 4.2A switching supply

The Mean Well NES-50-12 is an enclosed AT-type switching power supply that delivers a regulated 12 V output at up to 4.2 A. It provides 50.4 W of continuous power for low-wattage industrial, automation or embedded projects that need a compact AC-DC source.

Thermals noise and efficiency

The fully enclosed metal case acts as a heatsink, allowing fanless operation that keeps acoustic noise at zero during normal loads. High switching efficiency reduces wasted energy, so the unit runs warm rather than hot when supplying typical currents.

Sustained load behaviour

Designed for continuous duty, the supply maintains its rated 50.4 W output without derating or thermal shutdown during extended operation. Built-in over-voltage, over-current and short-circuit protection circuits engage cleanly if limits are exceeded, protecting connected equipment.

Highlights

  • Delivers 12 V at 4.2 A for stable low-power operation
  • 4 W continuous output handles modest loads reliably
  • Enclosed AT-type chassis protects internals from dust and contact
  • Brand-new unit with original Mean Well serial verification
  • Single-output design simplifies wiring in compact builds

Specifications

TypeAT

Questions about this item

How do I mount the Mean Well NES-50-12 and wire the AC input safely?

Fix the enclosed chassis to a flat surface using its mounting holes, then connect live, neutral and earth to the labelled input terminals before applying mains voltage.

Which component will need replacement first during continuous operation?

The internal electrolytic capacitors are the typical wear item; their lifespan depends on the operating temperature inside the enclosure.

At what load does the 12 V output reach its continuous limit?

The unit is rated for 4.2 A, giving 50.4 W at 12 V; sustained draw above that level will trigger the over-current protection.

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