The 20E621K is a varistor manufactured by COV with and rated for voltage of 600V to 900V. It is designed for use in through-hole installations and is compliant with RoHS standards. The varistor has a disc shape and a 10mm diameter, with polarized holes for easy installation. The varistor's capacitance rating is 1200pF, with an energy rating of 70J. Additionally, the 20E621K has an AC surge rating of 25A, a peak pulse current rating of 60A, and a rated power dissipation of 0.5W.