The B72220W2421K501 from TDK Corporation is a Varistor with AC Voltage Rating 420 V, DC Voltage Rating 560 V, Clamping Voltage 1120 V, Capacitance 550 pF, Temperature Operating Range -40 to 85 Degree C. Tags: Through Hole. More details for B72220W2421K501 can be seen below.