The Yageo 301KD20J Varistor with Through Hole RoHS is an electronic part that is designed to provide voltage protection in a variety of high-voltage applications. It is composed of a non-linear, semi-conductor material that can resist sudden, large changes in voltage, such as those caused by spikes. The 301KD20J Varistor has a hold current of 18V, a leakage current of 10mA, and a breakdown voltage of 20V. This part is designed for use in applications such as surge and transient protection, as well as EMI filtering. Additionally, it is RoHS compliant, meaning it does not contain hazardous substances over certain limits as set by the Restriction of Hazardous Substances Directive.