Why are fuse wires designed with a low melting point?

Fuse wires are designed with a low melting point so that they can melt quickly when excessive current flows through a circuit.

During situations like overloading or short circuits, the current increases beyond safe limits. The fuse wire heats up due to the heating effect of current and melts, thereby breaking the circuit.

This interruption stops the flow of current and protects electrical appliances and wiring from damage, as well as reduces the risk of fire.

Thus, a low melting point ensures that the fuse acts as a safety device, responding immediately to abnormal current conditions.