A circuit breaker is an automatically operated electrical switch designed to protect an electrical circuit from damage caused by over load or short circuit. Its basic function is to detect a fault condition and interrupt
current flow. 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 made in varying sizes, from small devices that protect an
individual household appliance up to large switch gear designed to protect high voltage circuits f
eeding an entire city.
eeding an entire city.