BGH-1120A
ActiveVariable Speed Trigger Switch 20.1A 42V DC
Defond variable speed trigger switch — found in most power tools globally.
Common Applications
Defond is the worlds largest trigger switch manufacturer — if your power tool was made in China (most are), the trigger is almost certainly Defond. 20A continuous rating handles the heaviest cordless tools. Variable speed with electronic speed control integration. Found in Black+Decker, DeWalt (TTI), Ryobi, and hundreds of other brands.
Specifications
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Contact Configuration
The electrical switching arrangement.
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Variable speed (electronic)
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Current rating
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20.1A
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Mechanical Life
How many press cycles before mechanical failure. Higher is better — 10M cycles at 100 presses/day = 274 years.
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50,000 cycles (5E4)
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Voltage
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42V DC
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Installation Quick Reference
Panel cutout: 22mm. Insert from the front of the panel, secure with mounting nut from behind (tighten to 2-3 Nm).
Contact block: Snap or screw the contact block onto the rear of the button body. Ensure the contact block orientation matches the wiring diagram — NO terminals are usually marked.
Wiring: Use 0.5-2.5mm² stranded wire with ferrules. Tighten screw terminals to 0.8 Nm. Test the button function before energizing the circuit.
Dimensions
Wiring Diagram
Troubleshooting
Button doesn't respond when pressed
Check the contact block first — it's the most common failure point. Test continuity across the NO or NC terminals with a multimeter. If no click is felt, the return spring in the head may be broken.
Works intermittently
Contact block contacts are pitted or burned. Replace the contact block — don't try to file the contacts. Check if the rated cycle count has been exceeded.
Button feels mushy or doesn't click
The spring return mechanism in the button head is worn. Replace the head. The contact block can usually be reused if it tests OK.
Where to Buy
Price range
$32.32 — $42.09
across 2 distributors
Quick Specs
- Contact Configuration
- Variable speed (electronic)
- Current rating
- 20.1A
- Mechanical Life
- 50,000 cycles (5E4)
- Voltage
- 42V DC
What People Are Saying
“Defond is the worlds largest trigger switch manufacturer — if your power tool was made in China (most are), the trigger is almost certainly Defond. 20A continuous rating handles the heaviest cordless ”