What is the function of a circuit breaker?

A circuit breaker serves an essential safety function by interrupting the flow of electricity during instances of overload or fault conditions, such as short circuits. When the electrical current exceeds a set limit, the circuit breaker automatically opens the circuit, halting the flow of electricity. This is crucial for preventing potential hazards such as electrical fires, equipment damage, and electrical shock.

The capability of a circuit breaker to detect faults and respond quickly helps protect both the electrical system and the devices connected to it. Unlike fuses, which must be replaced after they blow, circuit breakers can be reset, making them a convenient and reusable safety device. By fulfilling this role, circuit breakers are integral components in residential, commercial, and industrial electrical systems, ensuring safe operation and compliance with electrical codes and standards.