Circuit breaker trips only while the garbage disposal is actively running

Symptoms

• Breaker doesn't trip when the disposal is plugged in but off
• Trips within seconds of switching the disposal on
• No trip with other appliances on the same circuit
• Disposal may also feel like it's straining or humming before tripping

Likely causes

• CommonJam causing the motor to draw excess starting currentA stuck flywheel makes the motor pull much more current trying to start.
• PossibleWorn motor bearings or windings increasing current drawAn aging motor can draw more current than it's rated for even without a jam.
• PossibleBreaker sized too small or worn out for the disposal's actual startup currentStartup surge current is higher than running current and can trip a marginal breaker.

What to do

1. Turn off the disposal and check for a jam using the hex wrench with power off first.
2. Clear any debris found, since a jam is the most common reason for a startup current spike.
3. Reset the breaker and try the disposal again with the chamber confirmed empty and free-spinning.
4. If it still trips instantly with a clear chamber, that points to the motor itself or the breaker.
5. Try the disposal on a different circuit briefly if there's an accessible outlet, to help rule out a breaker problem.
6. Avoid repeatedly cycling a breaker that trips instantly; that's a sign of a real fault, not a nuisance trip.

Tools and parts

• 1/4-inch hex wrench
• Flashlight

When to call a pro

If a clear, unjammed disposal still trips the breaker instantly, have an electrician check the breaker and wiring, and plan to replace the disposal if the motor is at fault.

Safety