The MOV-20D821K from Bourns is a Varistor with AC Voltage Rating 510 to 670 V, DC Voltage Rating 738 to 902 V, Clamping Voltage 1355 V, Capacitance 600 pF, Temperature Operating Range -40 to 105 ºC. Tags: Through Hole. More details for MOV-20D821K can be seen below.