What is the primary function of a circuit breaker?

The primary function of a circuit breaker is to disconnect power during a circuit overload. This safety device automatically interrupts the electrical flow when it detects a fault or an overcurrent condition, preventing damage to the electrical system and minimizing the risk of fire. By interrupting the circuit, it protects wiring, devices, and user safety by ensuring that excessive current does not cause overheating or failures.

When a circuit exceeds its designed load, the circuit breaker will trip, breaking the circuit and stopping the flow of electricity. This rapid response is critical in maintaining the integrity of the electrical system and provides a higher level of safety compared to fuses, which need to be replaced after they blow. Understanding this function highlights the importance of circuit breakers in residential, commercial, and industrial electrical systems.