What is the purpose of including start and stop controls in a motor control circuit?

• A. To initiate or halt operation of the motor, enabling safe operation.
• B. To adjust motor speed.
• C. To power auxiliary lighting.
• D. To measure motor temperature.

Answer: (B)

Starting and stopping a motor is about giving the operator control to begin or end operation. In a motor control circuit, the start pushbutton energizes a contactor coil, which closes the main power contacts and lets current flow to the motor. The stop pushbutton breaks the coil circuit, dropping the contactor and cutting power to the motor. A holding contact keeps the circuit energized after the start button is released, so the motor keeps running until stop is pressed. This arrangement provides a safe, controllable way to operate the motor and protects both the operator and equipment. Speed control is handled separately by speed controls or drives, and lighting or temperature sensing serve different purposes.