What is the purpose of a circuit breaker?

A circuit breaker is designed specifically to prevent electrical fires and protect the electrical system by interrupting the flow of electricity during overload conditions. When the current exceeds a preset threshold due to faults such as short circuits or overloads, the circuit breaker automatically trips and opens the circuit, stopping the flow of electricity. This critical function prevents wires from overheating, potentially causing fires or damaging appliances and equipment.

The other options do not accurately describe the purpose of a circuit breaker. Increasing current flow is not a function of a circuit breaker; it is meant to limit current flow to safe levels. Stabilizing voltage is typically the role of other devices like voltage regulators or surge protectors. Connecting different circuits is not a circuit breaker's function, as its primary goal is to interrupt the flow of electricity to ensure safety and protection, not to facilitate connectivity between circuits.