The 221KD10J with Varistors Through Hole RoHS manufactured by Yageo is a two-terminal surface-mounted avalanche diode that is designed for protecting electrical circuits from surges in voltage and current. It has a 230 V AC rated avalanche voltage and a 10 J energy absorption capabilities. It is constructed with a non-flammable and RoHS-compliant Epoxy coating. The outer diameter of the device measures 22.5 mm, and it features a Through-Hole package for added stability. Due to its reliable performance and compact size, the 221KD10J is an ideal choice for use in a variety of applications, such as overvoltage protection in switches, appliance control circuits, lighting control systems, and many more.