What type of protection on a manual starter will prevent the automatic restart of a motor when recovering from a power loss?

The protection that prevents the automatic restart of a motor when recovering from a power loss is undervoltage protection. This feature is designed to monitor the voltage levels supplied to the motor. When a power loss occurs, the undervoltage protection detects that the voltage has dropped below a predetermined threshold. Once power is restored, the protection mechanism does not allow the motor to restart automatically until the voltage is stable and within the operational range.

This is critical for safety and equipment longevity, as an immediate restart could lead to damage or hazardous conditions if the motor attempts to start under insufficient voltage or unstable power conditions. Therefore, undervoltage protection acts as a safety gate, ensuring that the motor only re-engages when it is safe to do so.