What is the function of a circuit breaker?

The function of a circuit breaker is to protect electrical circuits from overloads and short circuits. When the current flowing through a circuit exceeds a certain threshold, indicating a potential hazard such as excessive heat or a fault condition, the circuit breaker automatically interrupts the flow of electricity. This action prevents damage to wiring and connected devices, significantly reducing the risk of electrical fires and equipment failures.

Unlike a connection device, which facilitates the flow of electricity, or a measuring instrument that tracks current levels, the primary role of a circuit breaker is safety-oriented. Additionally, the conversion of AC to DC power is a function performed by power supply devices, not a circuit breaker. Therefore, the role of the circuit breaker is critical in maintaining safe electrical systems by reacting to potentially dangerous conditions in real-time.