The difference between a contactor and a motor starter is

The difference between a contactor and a motor starter is

• A. They control speed
• B. They protect against short circuits
• C. Overload protection
• D. They control motor direction

Answer: (C)

The essential difference is that a motor starter includes overload protection in addition to switching, while a bare contactor is only a heavy-duty switch. A contactor simply closes or opens the circuit to start or stop the motor. A motor starter adds an overload relay that monitors current and will trip if the motor overheats or stalls, protecting the windings. This is why overload protection is the best answer. Other roles like speed control (handled by drives), short-circuit protection (handled by fuses/buses), and motor direction (determined by wiring/configuration) are separate considerations and not the defining difference between the two.

The essential difference is that a motor starter includes overload protection in addition to switching, while a bare contactor is only a heavy-duty switch. A contactor simply closes or opens the circuit to start or stop the motor. A motor starter adds an overload relay that monitors current and will trip if the motor overheats or stalls, protecting the windings. This is why overload protection is the best answer. Other roles like speed control (handled by drives), short-circuit protection (handled by fuses/buses), and motor direction (determined by wiring/configuration) are separate considerations and not the defining difference between the two.