IBEW Electrical Practice Test 2026 – Complete Exam Preparation

The role of a circuit breaker in an electrical system is primarily to interrupt the flow of current during overload conditions. Circuit breakers are designed as safety devices that protect electrical circuits and equipment from damage caused by excessive current, which can occur during short circuits or overloads. When the current exceeds the predefined limits, the circuit breaker automatically opens (or trips), stopping the flow of electricity to prevent potential hazards such as overheating, fires, or damage to appliances.

This function is crucial in maintaining the integrity of the electrical system and ensuring safety for both users and equipment. By effectively cutting off the current, circuit breakers help prevent catastrophic failures and allow for safe maintenance or troubleshooting of electrical systems.