The B72220U3131K502 from TDK Corporation is a Varistor with AC Voltage Rating 130 V, DC Voltage Rating 170 V, Clamping Voltage 340 V, Capacitance 2400 pF, Temperature Operating Range -40 to 125 Degree C. Tags: Through Hole. More details for B72220U3131K502 can be seen below.