What is a circuit breaker designed to do?

A circuit breaker is designed primarily to protect electrical circuits by interrupting the flow of current in the event of an overload or short circuit. When the current flowing through a circuit exceeds a safe level, the circuit breaker automatically shuts off the electricity to prevent damage to wires, devices, or even potential fire hazards. This interruption is crucial for maintaining safety and preventing electrical failures.

Unlike the options that suggest enhancing current flow or increasing voltage, which would lead to dangerous conditions if not properly controlled, a circuit breaker prioritizes safety by halting the current when necessary. Similarly, regulating temperature in electrical systems is not the primary function of a circuit breaker; rather, it focuses on managing current flow and ensuring that the system operates within safe limits.