The characteristics of industrial plug show that it has reliable characteristics. 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. 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. CEE connector CEE standard industrial plug socket is an explosion-proof socket, and the temperature is limited below 32 degrees. For example, at the beginning of product design, it clearly indicates which colors represent the rated voltage, for example, dark blue is the rated voltage of 220 volts and bright red is the rated voltage of 380 volts, which will give customers more visual data information, and it is easy to distinguish the differences of industrial plugs and it is not easy to make mistakes. Secondly, the main parameters of different types of industrial plugs are also different, including the diameter, a small number of circuit breaker components of their grounding devices, which can only be inserted in the specifications of the same model, and then the occurrence of incorrect plugs can be avoided to ensure the safety of application.In addition, the product also has the maintenance function of avoiding electric shock accidents of actual operators. The grounding plug sleeves of power plugs or power sockets are generally much longer than those of phase poles and central line poles, which thoroughly ensures that the grounding poles are connected before connecting the connected phase poles with each other, and can be safely removed when the product is pulled out. The product has a very high level of safety maintenance, and has various functional power plugs of different grades and main uses, which can not only maintain a part of the body that is not easy to touch the electricity, but also ensure safety in different natural environment standards.The industrial plug of the utility model has an improved sleeve, the sleeve is retractable, and the adjustable plug is more compact and firm when inserted, with better conductivity and longer service life. The product is also designed to keep the devices from falling off after being plugged with each other, so as to further improve the stability. The internal industrial plug also has cable clamp equipment, which makes it easier to clamp to the cable skin, because it is fixed and not easy to be pulled apart to ensure the application safety.