This is an automotive-grade, volumetrically small, radial-leaded varistor manufactured by Hongzhi Electronic Co, Ltd. The part has a 10D330K marking on it and is rated for 26V – 66V, 500A, with a through-hole build. It is compliant with the Restriction of Hazardous Substances (RoHS) directive for use in automotive and electric applications. The part is designed to protect circuits against transient overvoltages, also known as surge protection.