What is the function of a circuit breaker?

The function of a circuit breaker is to protect an electrical circuit from damage caused by overload or short circuit. When the electrical flow exceeds the safe limit, a circuit breaker automatically interrupts the current, preventing overheating, potential fires, or damage to appliances and wiring. This protective action ensures safety by providing a quick disconnection method to stop the flow of electricity in hazardous conditions, thereby mitigating risks associated with electrical faults.

In contrast, creating a shortcut in the circuit would lead to increased current flow and potentially dangerous situations, which is contrary to the protective role of a circuit breaker. Increasing the voltage in a circuit is the function of devices like transformers and does not relate to the protective features of circuit breakers. Similarly, converting alternating current (AC) to direct current (DC) is done by rectifiers, not circuit breakers, which specifically serve to disconnect circuits during overloads or faults.