Electric Motor Control

10th Edition
Publisher: CENGAGE L
ISBN: 9781133702818



Electric Motor Control

10th Edition
Publisher: CENGAGE L
ISBN: 9781133702818
Chapter 2, Problem 10SQ
Textbook Problem

Select the best answer for each of the following.

Thermal overload protection

a. aids motor warm-up.

b. prevents motors from freezing.

c. protects motors and conductors from mechanical damage.

d. provides overcurrent protection for motors.

To determine

Choose the correct option that represents the thermal overload protection.

Explanation of Solution


The over current (excess current) leads to an overload in the system. The motor can be protected from over currents by thermal overload protection.

Fractional horse power (FHP) manual starters have thermal overload protection equipment. The handle of the starter moves to the center position when the load exceeds the normal range in the system.

The contacts gets open and disconnect the motor very quickly from the supply. Therefore, the motor stops its operation. The contacts are advised to close after the overload protection equipment cools completely.

From the explanation, it is clear that, the option (d) is an adequate option...

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