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A circuit breaker cuts off an electrical circuit in building wiring any time that electrical current goes above a safe level. Its function is similar to a fuse, although circuit breakers can be used more than once.


To change a circuit breaker, switch off the main circuit breaker, and unscrew the load terminal wire. Remove the old breaker, and reverse the sequence used to remove it to install the new one. Use a voltage tester, a screw driver, and a new circuit breaker to complete t...


Relectric Supply sells ITE circuit breakers online via the company website and AllBreakers.com. Electric Motor Supply Company and Bay Breakers also offer ITE-Siemens circuit breakers. Electric Control Equipment Company is another source for ITE circuit breakers.


To test a circuit breaker using a multimeter, remove the circuit breaker box cover and turn the switch on. Using the multimeter's red prong, touch the screw that connects to the breaker. Touch the grounded box using the black prong. If there's no voltage reading, then t...


The function of a circuit breaker is to cut off electrical power if wiring is overloaded with current. They help prevent fires that can result when wires are overloaded with electricity.


Standard, GFCI and AFCI are the three different types of circuit breakers. The one needed for a particular project is dependent on what wattage goes through it.


Ensure the circuit breaker is to the Off position, then connect the wires to the terminals, the ground screw and the neutral screw. Install the breaker in the breaker box, and test it by turning the power on. If the breaker trips instantly, clear any short circuits.