The RV621K20_-HE from Stackpole Electronics is a Varistor with AC Voltage Rating 385 V, DC Voltage Rating 505 V, Clamping Voltage 1025 V, Capacitance 490 pF, Temperature Operating Range -40 to 85 Degree C. Tags: Through Hole. More details for RV621K20_-HE can be seen below.