Which safety device is designed to automatically shut off power due to overload?

The fuse is a critical safety device used in electrical systems to prevent damage and maintain safety by interrupting the flow of current in the event of an overload. When the electrical current exceeds the rated capacity of the fuse, the internal element of the fuse melts, thereby breaking the circuit and stopping the flow of electricity. This mechanism effectively protects the wiring and connected devices from overheating and potential fire hazards associated with overload conditions.

Fuses are designed to be a one-time use device, requiring replacement once they have operated. This fundamental principle makes them reliable for safeguarding electrical installations against overcurrent situations by ensuring that power is cut off before any damage can occur.