What is the main function of a circuit breaker?

The primary function of a circuit breaker is to interrupt electrical flow in a circuit in the case of an overload or short circuit. This is crucial for protecting both the electrical system and connected devices from damage caused by excessive current that can lead to overheating, electrical fires, or equipment failure. When a circuit detects conditions that exceed its safe limits, the circuit breaker automatically opens, stopping the flow of electricity. This safety mechanism is essential in residential, commercial, and industrial electrical systems, as it helps maintain the integrity of wiring and devices while ensuring the safety of occupants.

In contrast, stabilizing voltage levels or enhancing appliance efficiency are functions related to other devices like voltage regulators or power factor correction equipment. Regulating the frequency of electricity is a function associated with frequency converters and is not the role of a circuit breaker.