a switch that interrupts an electric circuit in the event of an overload

a piece of easily melted metal, which when inserted in an electric circuit, melts when the current becomes too great and blows when overloaded by too much demand

the opening of a switching device to de-energize cable or equipment.

A protective device built into an electrical circuit for the purpose of switching off the current when the load reaches a predetermined number of amps. All Gaugemaster controllers and cased transformers are fitted with these devices on all outputs. They reset automatically when the cause of the overload is removed.

A protective device that switches off the current when the load reaches a predetermined number of amps. This protects the electrical device.

a protective device installed on the primary side of the distribution transformer. It's used to prevent short-circuit currents from damaging the transformer itself or the secondary lines that are connected to the low-voltage side of the transformer. Cutouts are also used as switches to isolate the transformer or a single-line primary run-off to effect repairs on them.