What is the main function of a circuit breaker?

The main function of a circuit breaker is to interrupt the flow of current during faults. Circuit breakers are essential safety devices used in electrical systems to protect circuits from overcurrent situations caused by short circuits, overloads, or ground faults. When a fault occurs, the circuit breaker detects the abnormal current levels and automatically disconnects the circuit to prevent damage to electrical components, minimize the risk of fire, and ensure safety for people using the electrical system. This interruption is crucial for maintaining the overall integrity and functionality of the electrical system.

The other functions mentioned in the choices, such as amplifying signals, increasing power factor, and regulating voltage, are not within the scope of a circuit breaker's responsibilities. Amplifying electrical signals is a function typically associated with amplifiers, while power factor correction involves devices designed to improve the efficiency of electrical systems. Voltage regulation is usually the job of voltage regulators or transformers. Hence, the role of a circuit breaker is specifically focused on protecting electrical systems by stopping current flow to prevent damage during fault conditions.