What is the function of a circuit breaker?

The function of a circuit breaker is to automatically shut off power in case of overload or short circuit. This safety device protects electrical circuits from damage caused by excess current, which can lead to overheating, electrical fires, or damage to connected devices. When the current flowing through the circuit exceeds its safe capacity, the circuit breaker will trip, interrupting the flow of electricity and preventing potential hazards.

By doing so, circuit breakers ensure the safety of both the wiring and the devices connected to the circuit, making them a crucial component in electrical systems. They can be reset once the issue is resolved, allowing for safe operation without needing to replace a fuse, which is commonly used in older systems. The other options either imply functions that are not relevant to the role of a circuit breaker: increasing output, providing power, or regulating flow are functions associated with different types of electrical equipment.