CWEA Maintenance Technologist Practice Test 2026 – Complete Exam Prep

The function of a contactor primarily revolves around switching electrical circuits on and off. A contactor is an electrically controlled switch used for managing a high power circuit with a low power signal. It operates by using electromagnetic coils that, when energized, close or open the circuit.

This ability to control high voltage and high current systems is critical in applications such as motors, lighting systems, and other equipment that require safe and efficient circuit management. The design ensures that they can handle large electrical loads without the operator needing to be directly involved.

The other options describe functions that do not align with the role of a contactor. Regulating current is typically handled by devices like transformers or resistors, generating electrical power is performed by generators or power plants, and measuring voltage levels is the responsibility of voltmeters or similar measuring devices. Each of these functions involves different components and systems distinct from the fundamental operation of a contactor.