The ERZC20EK511 from Panasonic Corporation is a Varistor with AC Voltage Rating 320 V, DC Voltage Rating 415 V, Clamping Voltage 845 V, Capacitance 930 pF, Temperature Operating Range -40 to 85 Degree C. Tags: Chassis Mount. More details for ERZC20EK511 can be seen below.