The ERZC20EK681 from Panasonic Corporation is a Varistor with AC Voltage Rating 420 V, DC Voltage Rating 560 V, Clamping Voltage 1120 V, Capacitance 850 pF, Temperature Operating Range -40 to 85 Degree C. Tags: Chassis Mount. More details for ERZC20EK681 can be seen below.