The B72220U3421K502 from TDK Corporation is a Varistor with AC Voltage Rating 420 V, DC Voltage Rating 560 V, Clamping Voltage 1120 V, Capacitance 730 pF, Temperature Operating Range -40 to 125 Degree C. Tags: Through Hole. More details for B72220U3421K502 can be seen below.