The ERZC20EK621 from Panasonic Corporation is a Varistor with AC Voltage Rating 385 V, DC Voltage Rating 505 V, Clamping Voltage 1025 V, Capacitance 900 pF, Temperature Operating Range -40 to 85 Degree C. Tags: Chassis Mount. More details for ERZC20EK621 can be seen below.