The VDRH20X550ByE from Vishay is a Varistor with AC Voltage Rating 550 V, DC Voltage Rating 745 V, Clamping Voltage 1500 V, Capacitance 320 pF, Temperature Operating Range -40 to 125 Degree C. Tags: Through Hole. More details for VDRH20X550ByE can be seen below.