The RV821K25_-HE from Stackpole Electronics is a Varistor with AC Voltage Rating 510 V, DC Voltage Rating 670 V, Clamping Voltage 1355 V, Capacitance 750 pF, Temperature Operating Range -40 to 85 Degree C. Tags: Through Hole. More details for RV821K25_-HE can be seen below.