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Small rectangular trigger switch with lock button, grey plastic body, metal terminals visible

Superior Electric

Superior Electric SW54L Trigger Switch with Lock 10A 125V

SKU CH-NC05-58106

Trigger switch with lock, 10 A 125 V, four internal terminals, replaces Milwaukee 14-78-0550

  • Trigger lock enables secure continuous operation
  • 10 A 125 V rating matches original tool specs
  • Four internal terminals simplify wiring replacement
  • Direct replacement for Milwaukee 14-78-0550 switch
  • Integrated dust proofing extends service life

Replacement trigger switch for Milwaukee tools

The Superior Electric SW54L is an aftermarket trigger switch with lock designed to replace Milwaukee 14-78-0550 units. It handles on/off, variable speed and electric braking functions for high-rated bench-top and power tools.

Straightforward installation with basic tools

The switch uses four internal terminals that connect directly to the tool's existing wiring harness. Common issues include worn mechanical contacts causing intermittent operation or loss of variable speed control, which this replacement resolves.

Verify your tool uses the 14-78-0550 switch

Confirm the original part number matches before ordering. Check that your tool operates at 10A and 125V and requires an over-hang trigger style with integrated dust proofing and lock function.

How it compares

Measured against everything we stock in Air & Hydraulic Power Tools, at today’s prices. Recalculated every night.

Price $10.99
Cheaper than about 93% of the 243 comparable items (median $61.99).

Specifications

Product
Brand nameSUPERIOR ELECTRIC

Questions about this item

How can I confirm the SW54L trigger switch is working correctly after installation?

After fitting the switch, squeeze the trigger and verify the tool starts immediately; engage the lock button and confirm the tool stays running without holding the trigger; release the lock and ensure the tool stops cleanly when the trigger returns.

What comes with the SW54L switch and what must I source separately?

The package contains the trigger switch with lock and its four internal terminals; you will need to supply your own wire connectors, heat-shrink or electrical tape, and any mounting screws required by your specific tool housing.

Which version of this switch should I choose for a Milwaukee tool using part 14-78-0550?

The SW54L is the direct aftermarket replacement for Milwaukee 14-78-0550, rated 10A at 125V with an over-hang trigger, lock function and integrated dust proofing; select this model when your tool specifies that exact Milwaukee part number.

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