Contains a bi-metal strip that breaks the circuit when a current exceeds a predetermined rating.
A breaker indicates a broken circuit when the switch is in the mid-point, or tripped, position.
Reset the circuit breaker after correcting the overload problem. Switch it to the off position, then to the on position.
Another type of circuit breaker is a screw-in type that looks similar to a fuse, but has a button on the top. The button pops out when the circuit is broken.