Turn off or unplug sensitive equipment on the circuit
Wear appropriate safety gear
Identify the breaker you want to test
Switch the breaker fully to the OFF position
Switch the breaker back to the ON position
Use a multimeter to check for voltage at the breaker if qualified to do so
Press the breaker’s TEST button if it has one
Confirm the breaker trips when the TEST button is pressed
Reset the breaker by moving it fully to OFF, then back to ON
Check whether the connected circuit loses power when the breaker trips
Inspect the breaker for signs of damage, burning, or overheating
Replace the breaker if it does not trip properly or shows damage
Contact a licensed electrician if you are unsure or the breaker is in a main panel