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

The function of a circuit breaker in an electrical engineering system is to automatically stop electrical flow to prevent overload. Circuit breakers are designed to protect electrical circuits and devices from damage caused by excess current, which can occur due to faults, short circuits, or overload conditions. When the current exceeds a pre-set limit, the circuit breaker interrupts the flow of electricity, effectively disconnecting the circuit from the power source. This prevents overheating, potential fires, and other hazards that can result from current surges.

The other functions mentioned do not align with the primary purpose of a circuit breaker. Amplifying electrical signals is typically associated with amplifiers, while converting AC to DC involves rectifiers. Regulating voltage levels usually pertains to voltage regulators, which manage the output voltage in electrical systems. Therefore, the correct answer highlights the essential safety feature of the circuit breaker in safeguarding electrical systems.