What component of the electrical control box prevents the motor from overload?

• A. Fuse
• B. Circuit breaker
• C. Overload heaters
• D. Relay

Answer: (C)

The overload heaters are specifically designed to protect motors from overload conditions. When a motor operates beyond its rated capacity, the overload heaters absorb heat generated by the excessive current. This heat causes the overload heater elements to expand, leading to a mechanical action that trips the motor's overload protection switch. As a result, the motor is disconnected from power to prevent damage due to overheating, ensuring the longevity of the equipment and maintaining safe operation.

While fuses and circuit breakers also provide protective functions, they primarily focus on overcurrent and short-circuit conditions, cutting off the electrical supply before significant damage occurs. Relays, on the other hand, are devices that control the operation of larger current circuits based on the input signals but do not provide direct protection against overload conditions like the overload heaters do.