The B72220U3321K502 from TDK Corporation is a Varistor with AC Voltage Rating 320 V, DC Voltage Rating 420 V, Clamping Voltage 840 V, Capacitance 1000 pF, Temperature Operating Range -40 to 125 Degree C. Tags: Through Hole. More details for B72220U3321K502 can be seen below.