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

A circuit breaker serves a crucial role in electrical systems by providing protection against overloads and short circuits. Its primary function is to interrupt the flow of electrical current when it detects conditions that could lead to overheating or damage to electrical components. This interruption helps to prevent potential hazards such as fires, equipment damage, and electrical shocks.

When the current exceeds a predetermined level, indicating an overload situation, the circuit breaker automatically trips, effectively opening the circuit and stopping the flow of electricity. This safety feature ensures that wiring and devices are safeguarded against excessive current that could otherwise cause significant risks.

The other options relate to functions that a circuit breaker does not perform. For instance, increasing voltage, converting AC to DC, or consistently maintaining current flow are tasks associated with other components or devices within an electrical system, but not with the function of a circuit breaker itself.