The ZVX 30 S 0603 300 from Bourns is a Varistor with AC Voltage Rating 30 V, DC Voltage Rating 38 V, Clamping Voltage 77 V, Capacitance 80 pF, Temperature Operating Range -55 to 125 Degree C. Tags: Surface Mount. More details for ZVX 30 S 0603 300 can be seen below.