Terminal is an accessory product used to realize electrical connection, which is divided into the category of connector in industry. With the continuous improvement of industrial automation and stricter and more accurate industrial control requirements, the use of wiring terminals is gradually increasing. With the development of electronic industry, the application scope and types of terminals are increasing. In addition to PCB terminals, there are also hardware terminals, nut terminals, spring terminals and so on. 1928, Phoenix Electric invented the world's first combined terminal, which is the embryonic form of modern terminal and the first invention patent that Phoenix Electric applied for and obtained. Since then, Phoenix Electric has been keen on innovation and devoted to the development of various connection technologies, forming a perfect electrical interface technology system, many of which have become industry application standards.