The VDRS20W550ByE from Vishay is a Varistor with AC Voltage Rating 550 V, DC Voltage Rating 745 V, Clamping Voltage 1500 V, Capacitance 370 pF, Temperature Operating Range -40 to 85 ºC. Tags: Through Hole. More details for VDRS20W550ByE can be seen below.