What is the function of a circuit breaker in electrical systems?

The function of a circuit breaker in electrical systems is primarily to interrupt faulty circuits and prevent overheating. Circuit breakers are designed to automatically cut off the flow of electricity in the event of an overload or short circuit. This safety feature is crucial in protecting both the wiring and connected devices from damage due to excessive current, which can lead to overheating and potentially cause fires. By breaking the circuit when it detects a fault, the circuit breaker ensures that power is only restored once the issue has been resolved, thus enhancing the safety and reliability of the electrical system.

In contrast, storing electrical energy, limiting voltage drop, or enhancing signal strength do not accurately describe the role of a circuit breaker—their functions fall under different electrical components and systems.