What can happen if the selected protective device is rated too high for a motor?

When a protective device is rated too high for a motor, it may not trip in the event of an overcurrent condition. Protective devices, such as circuit breakers and fuses, are designed to interrupt the electrical flow when it exceeds a certain threshold, which helps prevent damage to the motor. If the rating is too high, the device may allow excessive current to pass through the motor for a longer period, leading to increased heat generation. This heat can cause insulation breakdown, overheating, and potentially result in motor failure. Therefore, selecting the appropriate protective device rating is crucial for the safe operation of electrical equipment, particularly to safeguard against overheating and subsequent damage.