What does a circuit breaker do?

A circuit breaker is an essential safety device in electrical systems that functions to protect circuits from overloads and short circuits. When excessive current flows through a circuit due to a fault or an overload condition, the breaker automatically interrupts the electrical flow. This interruption prevents damage to wiring, devices, and appliances, as well as mitigating the risk of fire hazards that can occur from overheating.

The circuit breaker acts as a switch that can reset after the fault has been resolved, unlike a fuse which must be replaced when it blows. By providing this protective mechanism, circuit breakers help ensure the safety and reliability of electrical systems in residential, commercial, and industrial applications.

In contrast, providing additional voltage, increasing current, or controlling the speed of electrical devices are not functions associated with a circuit breaker. These tasks are handled by other components in an electrical system, illustrating the specific role and importance of the circuit breaker in electrical safety.