What is the primary function of a circuit breaker in an electrical system?

The primary function of a circuit breaker is to limit current in the circuit automatically. Circuit breakers are designed to protect electrical circuits by interrupting the flow of electricity when they detect an overload or short circuit condition. This interruption helps prevent damage to wiring and equipment, as well as reducing the risk of fire or hazards caused by overheating.

When excessive current flows through the circuit, the circuit breaker trips, opening the circuit and stopping the flow of electricity. This safe disconnection is crucial in maintaining the integrity of the electrical system and ensuring the safety of users. By automatically limiting current when it exceeds safe levels, circuit breakers serve as a vital protective mechanism in electrical systems.