What is the function of a circuit breaker?

The function of a circuit breaker is to protect electrical circuits from overloads or short circuits. When the current in a circuit exceeds a certain level, which can happen due to an overload or a fault in the circuit, the circuit breaker automatically interrupts the flow of electricity. This prevents potential damage to the electrical system, minimizes the risk of fire hazards, and protects connected devices from being damaged by excessive current.

By breaking the circuit, the circuit breaker acts as a safety device. It monitors the electrical current and can trip, or shut off, the power supply when it detects conditions that could lead to overheating or electrical failure. This essential feature supports overall safety and reliability in electrical systems, ensuring that circuits operate within safe limits.

In contrast, the other options describe functions that do not align with what a circuit breaker does. Increasing current flow is not within the purpose of a circuit breaker, and converting AC to DC current refers to rectifiers, while ensuring constant voltage pertains to voltage regulators. The unique protective role of a circuit breaker is vital for maintaining safety and functionality in electrical installations.