The Capacitor Start Pool Motor is one of the most common motors found on in-ground pool pumps. This style of motor has a supplemental circuit consisting of a start windings and capacitor to increase the starting torque by 150-175% while decreasing the starting current. When the motor reaches 2/3 to 3/4 of full speed, a start switch will take the start windings and capacitor out of the running circuit. This guide identifies the major parts of this start circuit and explains how it operates. For more information on which motors use capacitors and how a capacitor fails , see our guide on "How To Select the Right Capacitor For Your Pool Pump Motor".