Which electrical device functions to prevent short circuits?

Fuses are designed specifically to protect electrical circuits from overheating and potential short circuits. When excessive current flows through a circuit, fuses will blow by melting a thin filament inside them, effectively breaking the circuit and stopping the flow of electricity. This action prevents damage to wiring and devices, and potential fire hazards that can occur with a short circuit. Each fuse is rated for a specific amperage, so if the current exceeds this rating, the fuse activates to protect the rest of the electrical system.

Other options may have their roles in electrical systems, such as resistors, which limit or regulate current flow, or relays, which control power in a circuit by acting as switches. Grounded outlets provide safety by directing excess electricity to the ground but do not inherently prevent short circuits. However, these devices do not serve the same protective function against excessive current flow as fuses do.