What is the function of a circuit breaker?

The function of a circuit breaker is to protect circuits from overload and short circuits by interrupting the flow of electricity when a fault condition is detected. When the current flowing through a circuit exceeds a preset limit due to overload or a short circuit, the circuit breaker automatically switches off to prevent damage to the wiring or devices on the circuit. This interruption is a crucial safety feature that helps prevent fires, electrical shocks, and other hazards related to excessive current flow.

Understanding this function highlights the importance of circuit breakers in electrical systems. They serve as safety devices that enhance the reliability and integrity of electrical circuits. In contrast, the other options describe functions that are not applicable to a circuit breaker. For example, increasing voltage supply is the role of transformers, regulating electrical currents relates more to devices like resistors or regulators, and providing a continuous power source pertains to power supply units or batteries.