Although a phase failure relay would be the optimal choice to protect a motor from overheating when a phase failure occurs, some motors have some protection provided by ___.

In the context of motor protection, both inherent overload (OL) protectors and properly sized overload protection in the starter contribute to safeguarding a motor from overheating in the event of a phase failure.

Inherent OL protectors are built into the motor. They detect excessive current that results from overload conditions, which can occur due to phase failures or other issues. When such an overload condition is detected, these protectors can automatically interrupt the power supply to the motor, preventing overheating and potential damage.

On the other hand, properly sized overload protection in the starter works by monitoring the current drawn by the motor. If the current exceeds a predetermined level for a set amount of time, the starter's OL protection interrupts the circuit, similarly preventing overheating. Having the correct size for this protection is essential to ensure that it operates effectively, as incorrectly sized protection could either trip too easily or fail to protect the motor adequately.

Thus, both types of protection can help mitigate the risks associated with overheating during a phase failure, making the answer that acknowledges either of these protective measures as suitable a valid choice.