Main circuit breakers shut off power to the whole house. Individual circuit breakers connect to circuits throughout the house. Each circuit is protected by a circuit breaker (or fuse) at the main panel that will automatically shut off the power to the circuit in the event of a dangerous electrical overload or short circuit. A circuit breaker can also be used manually to disconnect a circuit from incoming power so that you can repair or upgrade your outlets and fixtures. When you work on your home's electrical systems, it's important to shut off the power before handling electrical wires or components. Label circuits to identify which parts of the house they serve.

GFCI Circuit Breakers
Ground-fault circuit interrupters (GFCIs) are outlets or circuit breakers that shut off power instantly when a circuit shorts or overloads. They are often required for kitchen, bathroom, and outdoor circuits.