TeSys K differential thermal overload relay designed for the protection of AC and DC circuits and motors against overloads, phase failure, and load unbalance. It features an adjustable thermal setting range of 12 to 16 A and is optimized for direct mounting beneath TeSys K contactors (LC1K, LP1K, LP4K, LC7K). The relay includes integrated 1 NO + 1 NC auxiliary contacts and a selector for manual or automatic reset modes, ensuring robust motor safeguarding in a compact design.