A circuit breaker is an electrical safety device designed to protect an electrical circuit from damage caused by overcurrent/overloador short circuit. Its basic function is to interrupt current flow to protect equipment and to prevent the risk of fire. Unlike a fuse, which operates once and then must be replaced, a circuit breaker can be reset (either manually or automatically) to resume normal operation.
Circuit breakers are used in a wide variety of applications, from small residential circuits to large industrial and commercial installations. They are available in a variety of sizes and types, depending on the specific application.