The VDRS20W510ByE from Vishay is a Varistor with AC Voltage Rating 510 V, DC Voltage Rating 670 V, Clamping Voltage 1355 V, Capacitance 450 pF, Temperature Operating Range -40 to 85 ºC. Tags: Through Hole. More details for VDRS20W510ByE can be seen below.