What component is used to protect electric circuits from overheating?

Fuses are devices specifically designed to protect electrical circuits from overheating and potential damage caused by excessive current flow. When the current exceeds a predetermined level, the fuse contains a metal strip that melts, effectively breaking the circuit and stopping the flow of electricity. This safeguard prevents overheating, which could lead to circuit failure, fire hazards, or damage to connected components.

In contrast, resistors are used to limit current and divide voltages, capacitors store and release electrical energy, and diodes allow current to flow in one direction while blocking it in the opposite direction. While these components have their own important functions in a circuit, they do not provide the same protective function that fuses do, which is critical for preventing overheating and ensuring circuit safety.