Each circuit group has a switch, which are called ‘circuit breakers’. Labels will usually indicate which part of the house each switch controls. In the event that a circuit is overloaded it could become very hot and pose the risk of starting an electrical fire. The circuit breaker’s job is to stop this happening. If the current flow exceeds the rated amp value of the circuit, the switch is opens, “breaking” the flow of the current, shutting the power off to that circuit in a extremely short amount of time, stopping any chance of an accident happening. The circuit can be connected again simply by closing the switch.