Circuit Breaker: Description and Operation

A circuit breaker is used to protect a powered component (i.e..power windows, seats,....) system circuit. The automatic resetting circuit breaker can protect the system from a short circuit, or from an overload condition caused by an obstructed or stuck powered component.

The circuit breaker cannot be repaired and, if faulty or damaged, it must be replaced.

The circuit breaker contains a bi-metal strip between two contacts forming the link in the circuit. The automatic reset feature is used when the system circuit encounters an overload condition or a short to ground. An overload condition causes the bi-metal strip to heat and bend to the open position, disconnecting current flow to the circuit. Then as the system overload or short circuit is removed, the bi-metal strip cools, re-establishing contact to allow current flow to the circuit.