A circuit breaker is an electrical device that protects electrical circuits from overloads and short circuits. It functions as a switch that can open and close an electrical circuit, ensuring the safe and efficient operation of lighting systems. When electricity enters a home or building, it is distributed through a circuit breaker box or fuse box, where it is divided into multiple circuits. Each circuit is protected by a circuit breaker, which acts as a safeguard against excessive current flow. If the current exceeds the rated capacity of the circuit, the circuit breaker automatically trips or shuts off the circuit, preventing damage to the wiring and connected devices.