terminal is an accessory product used to realize electrical connection, which is divided into the category of connectors in industry. With the increasing degree of industrial automation and the stricter and more accurate industrial control requirements, the usage of terminal blocks is increasing gradually. With the development of electronic industry, the application scope and types of terminal are increasing. Besides PCB board terminals, there are also hardware terminals, nut terminals, spring terminals and so on. In 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 passionate about innovation, devoted to the development of various connection technologies, and formed a perfect electrical interface technology system, many of which have become industry application standards.