Which of the following best describes how circuit breakers function?

Circuit breakers are designed to protect electrical circuits from damage caused by overloads and short circuits. They accomplish this by automatically interrupting the flow of electricity when the current exceeds a predetermined level, which can happen during an overload condition. This interruption occurs rapidly to prevent overheating and potential fires, safeguarding appliances and wiring from damage.

The function of a circuit breaker is crucial because it ensures that electrical systems operate safely within their design limits. It's important to maintain appropriate current levels in any electrical system, and circuit breakers are an essential component in achieving this safety margin.

In contrast, increasing current flow under load would pose a risk of overheating and equipment failure, while allowing all current to pass without restriction would eliminate the safety mechanism that circuit breakers provide. Stabilizing voltage levels is a different function typically associated with voltage regulators or transformers, not circuit breakers.