A circuit breaker is an automatically operated electrical switch designed to protect an electrical circuit from damage caused by over-current, typically resulting from an overload or short circuit. Its function is to interrupt current flow after a fault is detected. Circuit breakers are designed to automatically open if the electrical current passing through them exceeds their ratings. Unlike a fuse, a circuit breaker can be reset to resume normal operation.
Circuit breakers primary tasks, when closed, must conduct current as efficiently as possible. When open, they insulate the contacts from one another, and in the event of a malfunction, they must disconnect the fault current as quickly and reliably as possible, thereby protecting equipment.
Circuit breakers are switches designed to automatically open if the electrical current passing through them exceeds their ratings, removing electrical power from a circuit.
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