What is the primary function of a circuit breaker?

The primary function of a circuit breaker is to limit current flow during an overload. A circuit breaker is designed to automatically interrupt the flow of electricity in a circuit when it detects a fault condition, such as an overload or short circuit. In situations where too much current flows through the circuit, the breaker trips, which prevents wiring damage, reduces fire risks, and enhances safety by protecting both the electrical system and connected devices.

This function is crucial for maintaining the integrity of electrical systems, as excessive current can cause overheating, which could lead to fires or damage to appliances. Therefore, the circuit breaker plays a vital protective role in homes and buildings.

In contrast, options related to converting AC to DC, acting as a ground reference, or measuring voltage serve different purposes within electrical systems. Although these functions are relevant in various contexts, they do not capture the primary role of a circuit breaker in managing current flow during fault conditions.