The VDRUS20Z420ByE from Vishay is a Varistor with AC Voltage Rating 420 V, DC Voltage Rating 560 V, Clamping Voltage 1120 V, Capacitance 510 pF, Temperature Operating Range -40 to 125 ºC. Tags: Through Hole. More details for VDRUS20Z420ByE can be seen below.