The characteristics of industrial plug show that, firstly, it has safe and reliable performance. NEMA wiring device must be as small as possible in order to realize frequent commutation, but also to realize braking during commutation and acceleration after commutation. Therefore, it is necessary to adopt commutation device quickly and braking device effectively. A switch is arranged between the weatherproof socket resistor and the electromagnetic switch, the fuse and the electromagnetic switch are connected with a power line, the power line is provided with a normally open switch of the electromagnetic switch, and the normally open switch of the electromagnetic switch is connected with the jack. IP54, that is, dust prevention is level 5: dust intrusion cannot be completely prevented, but the amount of dust intrusion will not affect the normal operation of the product; Waterproof grade 4: prevent splashing water from invading, and prevent splashing water from all directions from invading. For example, at the beginning of product design, determine what color represents the rated voltage, such as the rated voltage of 220 volts for blue and 380 volts for red, which can provide users with more intuitive data, and it is easy to distinguish the differences between industrial plugs without mistakes. In addition, different specifications of industrial plugs have different parameters, including plug diameter, plug number, grounding position and so on, so they can only be plugged into the same specification and model, thus preventing the occurrence of wrong wiring and ensuring the safe use. At the same time, this product also has the function of preventing electric shock of operators. Whether it is a plug or a socket, the socket of the grounding electrode is generally much longer than that of the phase electrode and the neutral electrode, which fully ensures that when connecting the interconnection electrode, the grounding electrode is well connected before connecting the interconnection electrode, and the product can be safely removed when being pulled out. This product has a high level of safety protection, and has a variety of functional plugs with different levels and uses, which not only protects the human body from touching live parts, but also can be used under different environmental conditions to ensure safety. The industrial plug has an extra elastic ring at the top of the socket, which can adjust the plug to make the contact closer and firmer, make the electrical conductivity better and prolong the service life. The product is also designed to be fixed after the devices are inserted into each other to prevent them from falling off, thus greatly improving the reliability of performance. There is a cable retaining device inside the industrial plug, which makes it easier to keep the cable sheath in place without pulling it out for safe use.