The 20D511K is a varistor with Through Hole RoHS manufactured by SOCAY. It is non-polarized, unidirectional, and designed to provide protection from overvoltage transients. It has a protective voltage from 11V to 510V, with a max peak current of 5.5A and a leakage current of 16µA. It has a maximum capacitance of 25pF, a maximum power rating of 350mW and a maximum operating temperature of +85?. It comes in a TO-226 package with low noise characteristics and a high energy absorption rate.