The 7D821K is a variable resistor manufactured by Hongzhi that is made for through-hole mounting. It has a breakdown voltage of 670V to 1355V and a current rating of 1.2KA. This part has been manufactured to comply with the RoHS (Restriction of Hazardous Substances) directive, which ensures that it does not contain any hazardous materials or substances. It is ideal for use in energy-handling applications, such as voltage and current regulation, filtering, and surge protection.