This kit may help to extend the life of a drive where large amounts of ripple current or regenerated power is present. The kit includes one 100V 470µF Capacitor and one 1N5375B Diode. The capacitor helps to protect the drive from ripple current from the power supply. Should there be too much regenerated power be created from a decelerating step motor, the zener diode will be sacrificed instead of the drive.