What is the primary function of a circuit breaker?

The primary function of a circuit breaker is to automatically stop the flow of current during overloads. Circuit breakers are designed to protect electrical circuits from damage caused by excess current that can arise due to faults, overloads, or short circuits. When the current exceeds a predetermined level, the circuit breaker "trips," interrupting the circuit and thereby preventing potential overheating, fires, or other hazardous situations that could result from prolonged overload conditions. This safety feature is essential in maintaining the integrity and safety of electrical systems.

While measuring current flow, providing a constant voltage, and allowing temporary power interruptions are all important aspects of electrical systems, they do not define the main purpose of a circuit breaker. The core function is primarily centered around the protection of the circuit.