What is the main function of a circuit breaker?

The main function of a circuit breaker is to prevent overload. A circuit breaker acts as a safety device in an electrical system by monitoring the electrical current flowing through a circuit. If the current exceeds a certain threshold, typically due to an overload or short circuit, the circuit breaker automatically interrupts the flow of electricity. This action prevents potential hazards such as overheating, electrical fires, and damage to electrical appliances or systems.

This functionality is crucial for maintaining the safety and integrity of the electrical system. It ensures that circuits can be reset after they trip, allowing for safe operation once the issue has been resolved. In contrast, other options such as regulating voltage, providing illumination, or increasing current do not accurately describe the primary role of a circuit breaker, which is specifically focused on protection against excessive current.