The B72220U3171K502 from TDK Corporation is a Varistor with AC Voltage Rating 175 V, DC Voltage Rating 225 V, Clamping Voltage 455 V, Capacitance 1800 pF, Temperature Operating Range -40 to 125 Degree C. Tags: Through Hole. More details for B72220U3171K502 can be seen below.