The VDR-10D821K is an integrated circuit varistor manufactured by VDR. It features a 630V through hole 2.5KA rated Varistor with a rated voltage range of 670V to 1355V. It is RoHS compliant, and is suitable for use in a wide range of applications, including signal protection, ESD protection, communication, and pulse suppression. It consists of sintered ZnO elements encased in a silicone coating, allowing it to achieve superior resilience to high energy transients. The device also features a high insulation resistance, fast response, and a high thermal stability, making it a great choice for high performance applications.