What is the main function of a circuit breaker?

The main function of a circuit breaker is to protect an electrical circuit from damage caused by overload or short circuit. When too much current flows through a circuit—whether due to an overload of devices drawing power or a fault in the system like a short circuit—the circuit breaker automatically interrupts the current flow. This action prevents overheating and potential fire hazards, thus safeguarding not only the electrical circuit but also the devices connected to it. The mechanism is designed to react quickly to unsafe conditions, ensuring the safety and integrity of the electrical system.

Options focusing on reducing power consumption, providing backup power, or increasing voltage do not accurately describe the purpose of a circuit breaker. Instead, these points relate more to other electrical components or systems that serve those specific functions. Understanding the role of a circuit breaker emphasizes its importance in electrical safety and proper circuit management.