What is the primary function of a circuit breaker?

The primary function of a circuit breaker is to protect electrical circuits from overload. Circuit breakers are critical safety devices that automatically interrupt the flow of electricity in a circuit when they detect a fault, such as an overload or short circuit. This helps to prevent damage to wiring, devices, and equipment, as well as reduce the risk of fires caused by overheating. By rapidly cutting the power supply, circuit breakers ensure that electrical systems operate safely and reliably.

In the context of the other options, while regulating power, converting AC to DC, and amplifying voltage levels are important functions in electrical systems, they are not the primary role of a circuit breaker. The main focus of a circuit breaker is its protective function, which is vital for maintaining the safety and integrity of electrical circuits.