The OV 20 K 474 MX 122 from Bourns is a Varistor with AC Voltage Rating 20 V, DC Voltage Rating 26 V, Clamping Voltage 54 V, Capacitance 470 pF, Temperature Operating Range -40 to 125 Degree C. Tags: Through Hole. More details for OV 20 K 474 MX 122 can be seen below.