What is the purpose of a circuit breaker?

A circuit breaker is a crucial safety device in electrical systems, primarily serving to protect electrical circuits from overloads. It automatically interrupts the flow of electricity when it detects an excessive current, which can occur due to faults such as short circuits or too many appliances drawing power simultaneously. By stopping the current flow, a circuit breaker prevents the risk of overheating and potential fires, ensuring the safety of the entire electrical system.

The other options do not align with the primary purpose of a circuit breaker. Providing insulation is related to preventing electrical leakage, while increasing power supply does not pertain to circuit breakers as their function is not to amplify power but to manage it safely. Additionally, connecting two circuits falls outside the scope of a circuit breaker’s functionality, as its role is more about interruption and protection rather than connectivity. Thus, the function of a circuit breaker is essential in maintaining the integrity and safety of electrical systems by guarding against dangerous overload conditions.