What is the function of a circuit breaker in an electrical system?

The function of a circuit breaker in an electrical system is to automatically stop current flow in case of an overload. This safety device is designed to protect electrical circuits from damage caused by excess current that can occur due to faults or malfunctions. When the current exceeds a predetermined limit, the circuit breaker trips, interrupting the flow of electricity and preventing overheating, potential fires, and damage to equipment.

This automatic disconnection is crucial for maintaining the safety and integrity of electrical systems. Additionally, circuit breakers can often be reset after tripping, allowing the system to restore functionality without needing to replace fuses or other components. The other options, such as boosting electrical current, regulating temperature, or transforming voltage levels, do not define the primary role of a circuit breaker, which is fundamentally about protection against excessive electrical flow.