What functions does a circuit breaker serve in an electrical system?

A circuit breaker is a crucial safety device in an electrical system, primarily serving to protect against overloads and short circuits. When an overload occurs, typically due to too many devices drawing more current than the circuit can handle, the circuit breaker interrupts the flow of electricity to prevent overheating and potential fires. Similarly, in the case of a short circuit, which can happen when there's a fault in the wiring or a device, the circuit breaker reacts quickly to cut off the electrical supply, safeguarding equipment and reducing safety hazards.

The design of a circuit breaker allows it to reset after it has trip worked, thus providing continued protection without the need for replacement, which is a significant benefit over traditional fuses. Understanding this function is essential for maintaining safe and reliable electrical systems.