The B72220W2551K501 from TDK Corporation is a Varistor with AC Voltage Rating 550 V, DC Voltage Rating 745 V, Clamping Voltage 1500 V, Capacitance 410 pF, Temperature Operating Range -40 to 85 Degree C. Tags: Through Hole. More details for B72220W2551K501 can be seen below.