What is the main function of a circuit breaker?

The main function of a circuit breaker is to interrupt current flow during faults. When an electrical fault occurs, such as a short circuit or overload condition, the circuit breaker detects the abnormal current flow and automatically opens its contacts, thereby stopping the flow of electricity. This action protects the electrical system and connected devices from damage caused by excessive current, which can lead to overheating, fires, or equipment failure. By ensuring that the circuit is disconnected from the power source during such faults, circuit breakers play a crucial role in safeguarding both people and property.

In contrast, while providing additional outlets, controlling power distribution, or converting energy types are important functions within electrical systems, they do not specifically define the primary role of circuit breakers. The focus on interrupting current flow during faults highlights the safety aspect and protective function that circuit breakers are designed to perform.