What best describes the purpose of circuit breakers in electrical installations?

The primary purpose of circuit breakers in electrical installations is to prevent overload and protect the circuit. Circuit breakers serve as safety devices designed to automatically interrupt the flow of electricity in the event of an overload or fault condition, such as a short circuit. This action helps prevent potential dangers, including electrical fires, equipment damage, and personal injury.

When the electrical current exceeds the rated capacity of the circuit, the circuit breaker trips, breaking the circuit and stopping the flow of electricity. This protective function is crucial in maintaining the safety and reliability of electrical systems. In contrast, other options such as enhancing power supply, boosting signal strength, or converting electrical currents do not accurately represent the role of circuit breakers, as these functions are related to different components or systems within electrical engineering.