How does a fuse protect an electrical circuit?

A fuse protects an electrical circuit by melting and breaking the circuit when the current exceeds a certain level. This mechanism is crucial for preventing damage to both the electrical wiring and connected devices. When the current flowing through the fuse rises above its rated capacity, the fuse wire heats up due to the resistance it encounters. Once the temperature reaches a critical point, the wire melts, creating an open circuit that stops the flow of electricity.

This interruption helps to prevent overheating, potential fire hazards, and equipment damage that could result from excessive current. Fuses act as a safety device by ensuring that the electrical system operates within safe limits, safeguarding both the users and the integrity of the electrical appliances connected to the circuit.