What function does a circuit breaker primarily serve?

A circuit breaker primarily serves multiple critical functions that are essential for electrical safety and system reliability. It is designed to limit current flow to prevent excessive levels that could damage the electrical system or connected devices. When current exceeds the designated limit usual during a fault, such as an overload or short circuit, the breaker responds to contain the situation, effectively preventing potential hazards.

Moreover, circuit breakers provide protection against overloads. An overload occurs when the electrical load surpasses the rated capacity, leading to overheating and potential fire risks. By interrupting the flow of electricity under these conditions, circuit breakers help safeguard equipment and prevent dangerous situations.

Additionally, circuit breakers can act as a switch to turn the power supply on and off. This function allows users to conveniently control power to specific circuits or electrical devices without the need for physical disconnection.

The combination of these functions—limiting current flow, protecting against overloads, and serving as a controllable switch—makes the circuit breaker an integral component of electrical systems, ensuring both safety and functionality.