Which device is primarily used to protect electrical circuits from overloads?

A fuse is primarily used to protect electrical circuits from overloads by breaking the circuit when the current exceeds a specified level. When an overload occurs, the fuse element heats up due to the excess current and eventually melts, interrupting the circuit. This action prevents damage to wiring and connected devices, effectively safeguarding against potential hazards such as fires or equipment failure.

In contrast, a relay is primarily used to control the flow of electricity in a circuit by opening or closing contacts in response to an external control signal. While relays can provide some level of protection by switching off a circuit under specific conditions, they are not designed solely for overload protection.

Capacitors and inductors serve different functions within electrical circuits. Capacitors store and release electrical energy and are often utilized for filtering or smoothing purposes, while inductors store energy in a magnetic field and are used in applications like transformers and filters. Neither component serves to protect circuits from overload conditions. Therefore, the fuse is the most appropriate choice for providing overload protection.