* Square D single pole ground fault breaker
* Phillips head screwdriver
* Flat head screwdriver
* Wire stripper
* Electrical tape
1. Turn off the power to the circuit you will be working on. This can be done by flipping the circuit breaker to the "Off" position or by removing the fuse from the fuse box.
2. Remove the cover plate from the electrical box. There may be one or two screws holding the cover plate in place. Use a Phillips head screwdriver to remove the screws.
3. Remove the old circuit breaker. There will be two screws holding the circuit breaker in place. Use a Phillips head screwdriver to remove the screws. Once the screws are removed, the circuit breaker can be pulled out of the electrical box.
4. Connect the wires to the new circuit breaker. The black wire goes to the "Line" terminal, the white wire goes to the "Load" terminal, and the green or bare wire goes to the "Ground" terminal. Use a flat head screwdriver to loosen the terminal screws, insert the wires, and then tighten the terminal screws.
5. Install the new circuit breaker in the electrical box. Push the circuit breaker into the electrical box until it snaps into place.
6. Replace the cover plate. Use a Phillips head screwdriver to replace the screws that hold the cover plate in place.
7. Turn on the power to the circuit. Flip the circuit breaker to the "On" position or replace the fuse in the fuse box.
8. Test the circuit breaker. Plug a lamp or other appliance into the outlet on the circuit and turn it on. The circuit breaker should trip if there is a ground fault.
* If you are not comfortable working with electricity, hire an electrician to install the circuit breaker for you.
* Make sure the circuit breaker you are installing is the correct size for the circuit. The circuit breaker should be rated for at least the same amperage as the circuit it is protecting.
* Never overload a circuit breaker. This can cause the circuit breaker to trip or even catch fire.
* If you are replacing a circuit breaker in an old electrical box, you may need to replace the electrical box as well. Old electrical boxes may not be big enough to accommodate modern circuit breakers.