The B72220U3551K502 from TDK Corporation is a Varistor with AC Voltage Rating 550 V, DC Voltage Rating 745 V, Clamping Voltage 1500 V, Capacitance 550 pF, Temperature Operating Range -40 to 125 Degree C. Tags: Through Hole. More details for B72220U3551K502 can be seen below.