The FTR10D390K is an EMI Radial Varistor manufactured by FTR, with a maximum DC voltage of 31V and 77V, and a rated current of 500A. This part is designed to provide surge suppression for sensitive electronics, and it is constructed with a through-hole mounting hole that measures 7.5 mm in diameter. All parts are RoHS compliant, meaning they are made without hazardous materials.