The MVR40D391K-S from Meritek Electronics Corporation is a Varistor with AC Voltage Rating 250 V, DC Voltage Rating 320 V, Clamping Voltage 650 V, Capacitance 5100 pF, Temperature Operating Range -40 to 105 Degree C. Tags: Through Hole. More details for MVR40D391K-S can be seen below.