Which statement best describes the difference between a control relay and a contactor?

• A. They switch control circuits
• B. True
• C. They both switch power exactly the same
• D. False

Answer: (C)

The key idea is that both devices are electromechanical switches driven by a coil. When the coil is energized, their contacts close to allow current to flow; when de-energized, the contacts open to interrupt the circuit. This shared switching action is why they’re described as both switching power in a similar way. The difference lies in scale and application: a contactor is designed to handle high-current, high-power loads such as motors and heaters, while a control relay is built for switching smaller control circuits and signals inside a control panel. So, while they’re not identical in size, ratings, or construction, the fundamental function—closing and opening a circuit under coil control—is the same, making that statement the best fit among the options.