The B72220S2511K101 with EPCOS TDK Varistors 510V RMS 20MM RADIAL Varistor S20K510E2 is a 20mm surface mounted varistor specifically designed to protect high voltage power lines. It is manufactured by TDK. The device is designed to limit the surge voltage of up to 510 V RMS and can handle up to 2kA peak current. It is made of a non-flammable ceramic core with a UL94-VO flame rating. It features high capacitance stability and fast response. The device is suitable for a wide range of applications in industrial and other high voltage applications.