Industrial Maintenance Technician Practice Test 2025 – 400 Free Practice Questions to Pass the Exam

The primary function of a circuit breaker is to protect an electrical circuit from damage. This protective device automatically interrupts the flow of electricity when it detects an overload or a fault condition, preventing excessive current from passing through the circuit. By doing so, a circuit breaker safeguards not only the wiring and components of the electrical system but also reduces the risk of electrical fires and other hazards. This crucial function helps maintain the safety and reliability of electrical systems in residential, commercial, and industrial settings.

In contrast, measuring electrical current is not within the circuit breaker's functional capabilities; that task is handled by ammeters and other measuring devices. Converting AC to DC is performed by rectifiers, not circuit breakers, and increasing electrical voltage is the role of transformers. Therefore, the function of a circuit breaker as a protector is vital for ensuring the longevity and safety of electrical installations.