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A circuit breaker is an electrical safety device designed to protect an electrical circuit from damage caused by an overcurrent or 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 made in varying sizes, from small devices that protect low-current circuits or individual household appliances, to large switchgear designed to protect high voltage circuits feeding an entire city. The generic function of a circuit breaker, or fuse, as an automatic means of removing power from a faulty system, is often abbreviated as OCPD (Over Current Protection Device). Also, there are many different types of Smart Circuit Breaker, Ewelink WIFI Circuit Breaker, Tuya WIFI Circuit Breaker, RS485 Circuit Breaker, Remote Control Circuit Breaker, Zigbee Circuit Breaker, Solar Systems Circuit Breaker, Automatic Recloser Circuit Breaker, DC WIFI Circuit Breaker, RS485 DC Circuit Breaker, etc.
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