In different places and natural environments, the regulations of industrial plugs and couplers are different. 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. Industrial plugs are suitable for industry, generally divided into 3-core, 4-core, 5-core, etc. The current is generally divided into 16A, 32A, 63A, 125A, 250A, 420A, etc., and the protection level can be divided into IP44 and IP67, which are relatively conventional. Generally, it is used with industrial sockets and industrial connectors. CEE connector CEE standard industrial plug socket is an explosion-proof socket, and the temperature is limited below 32 degrees. It can be selected according to the main purpose, office environment, specification, size, shape design, installation method, function, etc. Only by choosing the right products can we ensure safe and effective use.I. Route of application(1) The power outlet must be used on the route connected to the power supply system, which needs to be covered to avoid electric shock accidents. For example, you can see all kinds of power plugs and power plug boxes in the production workshop of the processing plant.(2) RF connectors and equipment input power sockets must be used in the middle of the cable. The radio frequency connector is suitable for connecting to the terminal of the power supply system and has a cover to avoid electric shock.(3) On the cable receiving channel, as the key-in socket of power consumption machinery or equipment or connecting the receiving cable, it is necessary to use industrial plug or equipment to key in the power socket.Second, considering the office environment1. Safety protection features(1) Under the general natural environment standard, such as the production workshop of general processing plant, the socket type waterproof case plug can fully meet the requirements.(II) ip67 industrial plugs must be used in extreme natural environment or places that need to be immersed in water, such as concrete production plants, Ningxia construction sites, ports and other places where there is smoke or water infiltration, and their safety protection characteristics meet the requirements.2. Shell safety protection raw materials(1) plastic. Generally, sockets are made of plastic shell, and the characteristics of each layer are very good, which can be used in general work sites.(2) Vulcanized rubber. The medium can use grey-black vulcanized rubber shell plug.(3) Aluminum alloy profiles. There are some production workshops with high operating temperature and sparks, such as iron-making and steel-making workshops, forging workshops, etc. Under the unique natural environment standard of industrial production, aluminum alloy profile shell industrial plugs should be selected.Application of working voltage, current and frequencyThe pole number of the socket plug is determined according to whether the switching power supply of the power consumption machine equipment is single-phase or three-phase. Single-phase switching power supply should be 3 poles, and 3-phase power supply should be grounded with 4 poles, otherwise, it should be 5 poles. Then, select the relative specifications and models according to the rated current of the machine and equipment, the current level and frequency in operation.China's communication AC power grid generally has three-phase 380v, single-phase 220v and frequency 50hz.Or key slot, polar partThe hours of electrical fittings with rated current not more than 50v in keyway or groove are shown in Table 1-5; The hours of electrical fittings with rated current greater than 50v on the pole are shown in Table 1-6. According to rated operating frequency and frequency reference.In China power grid, the working voltage of switching power supply is 380v or 220v, and the frequency is 50hz. Therefore, the rated current of socket plug is 380v or 220v, the frequency is 50hz, and the pole part is 6h, which is the most common one.