Which device interrupts a circuit when the current exceeds a specified value?

A circuit breaker is specifically designed to interrupt an electrical circuit when the current exceeds a predetermined value. It serves as an essential safety mechanism, protecting electrical systems from excessive current flow, which can lead to overheating and potentially start a fire. When the current reaches a level that poses a danger, the circuit breaker automatically opens the circuit, stopping the flow of electricity.

Unlike other options, a circuit breaker can be reset after it trips, allowing the circuit to be re-established without needing to replace a part. This feature makes it more convenient for regular use in residential and commercial systems compared to devices like fuses, which must be replaced once they blow. Capacitors and diodes, while important components in circuits, do not serve the function of interrupting current flow due to overload conditions.