When are fuses typically used in electrical systems?

Fuses are specifically designed as safety devices that protect electrical circuits by interrupting the flow of current in cases of overload. When too much current flows through a circuit, the fuse contains a thin metal strip that melts, effectively breaking the circuit and preventing further current from flowing. This interruption helps prevent potential hazards such as electrical fires or damage to electrical appliances and wiring systems.

The other options do not accurately describe the purpose and functionality of fuses. Enhancing current flow is not a function of fuses; rather, they are intended to limit current to safe levels. Fuses do not reduce voltage levels; their role is not related to voltage transformation. Lastly, while a fuse may be a key component in circuit protection, it is not used for repairing damaged wiring; damaged wiring generally requires replacement or proper repairs rather than the use of a fuse.