The B72230M0321M401 from TDK Corporation is a Varistor with AC Voltage Rating 320 V, DC Voltage Rating 420 V, Clamping Voltage 1400 V, Capacitance 1600 pF, Temperature Operating Range -40 to 85 Degree C. Tags: PCB Mount, Through Hole. More details for B72230M0321M401 can be seen below.