What is the primary function of a fuse?

The primary function of a fuse is to provide overcurrent protection by melting a wire. Fuses are designed to protect electrical circuits from excessive current flow, which can result from overloads or short circuits. When the current exceeds a predetermined level, the metal wire or strip within the fuse heats up and eventually melts, breaking the circuit and stopping the flow of electricity. This action prevents damage to the electrical devices connected to the circuit, thereby ensuring safety and preventing potential fires caused by overheating.

Fuses do not store electrical energy, increase circuit voltage, or directly regulate power supply. Their specific role is critical in safeguarding electrical systems by ensuring that the circuit is interrupted when current levels become unsafe, thus preventing damage and hazards.