What happens to a fuse when it operates?

When a fuse operates, it reacts to an overcurrent situation by melting and breaking the electrical circuit. This is a safety mechanism designed to prevent damage to the wiring and electrical devices connected to the circuit. Because it fundamentally alters its physical state to interrupt the flow of electricity, a fuse cannot be reset or repaired. Instead, once it has blown, it must be replaced with a new fuse to restore functionality to the circuit. This characteristic ensures that the protection mechanism remains effective against future overloads, emphasizing the importance of regular checks and maintenance of fuses within an electrical system.