What is the function of a circuit breaker?

A circuit breaker serves a crucial role in electrical systems by protecting circuits from overloads and short circuits. When the current flowing through a circuit exceeds a certain threshold due to an overload or a short circuit, the circuit breaker automatically interrupts the flow of electricity. This interruption prevents potential hazards, such as overheating of wires or the risk of fire, and ensures the safety of both the electrical system and its users.

Connecting different electrical circuits, measuring electric current, and converting electrical energy into mechanical energy are functions associated with other components in electrical systems. For instance, circuit breakers do not connect circuits; that role is typically fulfilled by switches or junctions. Likewise, measuring electric current is done with ammeters, not circuit breakers. The conversion of electrical energy into mechanical energy is the function of devices like electric motors, further illustrating the specific protective function of a circuit breaker.