The potential relay places the start capacitor in series with the start winding. It senses the voltage developed across the start winding (C-S). It is designed to pick up, open its contacts and disconnect the start capacitor from the start winding, when sufficient voltage is generated. The relay will open when the motor has started and is approaching normal running speed.
 

Feature

• Self adjusting to motor current – no manual adjustment or calibration necessary
• Thyristor protected contactor for long life
• No extra motor contactor needed
• Self diagnostics