Which device is used to start and protect electric motors?

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Multiple Choice

Which device is used to start and protect electric motors?

Explanation:
Starting and protecting a motor is handled by a motor starter. It combines the means to energize the motor (often via a contactor that closes when you press start) with protection that disconnects power if something goes wrong, such as an overload relay tripping if the motor draws too much current or overheats. The other items don’t fulfill both roles: an overload by itself only stops the motor when current is excessive, bearings are just mechanical supports, and an encoder is a speed/position sensor for control systems, not a starting or protection device.

Starting and protecting a motor is handled by a motor starter. It combines the means to energize the motor (often via a contactor that closes when you press start) with protection that disconnects power if something goes wrong, such as an overload relay tripping if the motor draws too much current or overheats. The other items don’t fulfill both roles: an overload by itself only stops the motor when current is excessive, bearings are just mechanical supports, and an encoder is a speed/position sensor for control systems, not a starting or protection device.

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