What is the function of a circuit breaker in an electrical system?

The function of a circuit breaker in an electrical system is to protect the circuit from overload or short-circuit conditions. When there's an incoming electrical current that exceeds the safe limits due to issues like excessive load or faults, the circuit breaker automatically interrupts the flow of electricity. This prevents overheating and potential damage to circuit components, and it reduces the risk of electrical fires.

In a broader context, circuit breakers are critical safety devices within electrical systems, serving to ensure safe operation. They provide a means for manual control and can be reset after a fault condition has been resolved, offering both protection and convenience.

The other options describe functions that are not performed by circuit breakers. Enhancing electricity flow and regulating voltage levels are typically the functions of electrical equipment such as transformers and capacitors. Measuring current levels is done using ammeters or other types of metering devices, not circuit breakers. Hence, the primary role of a circuit breaker remains focused on protection against electrical hazards.