The ERZC20EK781Y from Panasonic Corporation is a Varistor with AC Voltage Rating 485 V, DC Voltage Rating 640 V, Clamping Voltage 1290 V, Capacitance 800 pF, Temperature Operating Range -40 to 85 Degree C. Tags: Chassis Mount. More details for ERZC20EK781Y can be seen below.