The MVR40D821K-S from Meritek Electronics Corporation is a Varistor with AC Voltage Rating 510 V, DC Voltage Rating 670 V, Clamping Voltage 1355 V, Capacitance 2900 pF, Temperature Operating Range -40 to 105 Degree C. Tags: Through Hole. More details for MVR40D821K-S can be seen below.