The ERZC20EK391 from Panasonic Corporation is a Varistor with AC Voltage Rating 250 V, DC Voltage Rating 320 V, Clamping Voltage 650 V, Capacitance 1200 pF, Temperature Operating Range -40 to 85 Degree C. Tags: Chassis Mount. More details for ERZC20EK391 can be seen below.