What is the main purpose of a circuit breaker?

The main purpose of a circuit breaker is to interrupt the flow of electricity during overload or short circuits. Circuit breakers are designed as safety devices that protect electrical circuits from damage caused by excessive current. When the current exceeds a predetermined limit, the circuit breaker automatically detects this condition and opens the circuit, stopping the flow of electricity. This helps prevent overheating, potential fires, and damage to electrical equipment that can occur as a result of prolonged overcurrent conditions.

In essence, circuit breakers function as a safeguard, ensuring that electrical systems operate safely and preventing hazards that could arise from electrical faults. The ability to reset a circuit breaker after it trips makes it a practical choice over fuses, which need replacing once they blow.