The produced industrial plug is widely used in the drainage treatment of steel-making, petrochemical, construction sites and other factories that need a lot of power or various industrial and mining enterprises, and is the next generation power supply. IP54, that is, dustproof level 5: it cannot completely prevent dust intrusion, 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. Industrial plugs are applicable to industry, generally divided into 3-core, 4-core, 5-core, etc. Current is generally divided into 16A, 32A, 63A, 125A, 250A, 420A, etc. The protection level can be divided into IP44 and IP67, which are relatively conventional. Generally, it is used with industrial sockets and connectors. Industrial plugs can be used in various environments. The whole plug is sealed by rubber, which has good sealing effect and strong waterproof performance. There is no problem in outdoor use, and the weather can be normal after long-term use. Industrial plugs are divided into sockets and electrical input sockets. Their common feature is that they can be fixed on walls and plugged-in devices. The fixing method is the same, all of which are fixed by flanges. Different addresses, socket contacts are sockets, and household appliances input socket contacts are plugs.I. Classification(1) classified by purpose. Used for power lines, usually called sockets; The other is on the power supply equipment, the equipment input socket.(2) According to the protection level, it can be classified into splash protection (ip44) and immersion protection (ip67).(3) Classification according to the structure of grounding contacts. There are polar regions and polar regions. All sockets and appliances with rated voltage greater than 50V have earth poles, and those with rated voltage less than or equal to 50V have no earth poles.(4) Classification according to installation method. It is divided into concealed hanging type (also called embedded type) and open type (also called wall hanging type).(5) Classification according to interlocking structure. The utility model is a mechanical interlocking socket and an interlocking socket respectively. Figure 2. 1 specifications. rated currentAccording to gb/t 11919-2001, domestic I series, namely 16,32,63,125 a.2. Rated voltageThe voltage specifications are divided into two categories (the voltage level is shown in the color of the shell):(1)≤50v: 20 ~ 25v (purple), 40 ~ 50v (white);(2) > 50v: 100 ~ 130v (yellow), 200 ~ 250v (blue), 380 ~ 480v (red) and 500 ~ 690v (black).Ac 220v and 380v are commonly used AC power sources in domestic power grids.3. Rated frequencyThere are 50 and 60, 100 ~ 300 and so on. 50Hz is commonly used in domestic power grid.4. Small keys or keywaysThe rated voltage is 50v, and the keyway position is determined by the working voltage and frequency.5. Location of grounding contactWhen the rated voltage is greater than 50v and the earth pole is 1 ~ 12o', the rated voltage and frequency are determined.The usual pole position is six o'clock.6. Pole number(1) when the rated voltage is less than or equal to 50V, there are 2 poles (2P) and 3 poles (3P).(2) When the rated voltage is greater than 50v, the number of single-phase and three-phase power supply poles is different, and the number of sockets or sockets is divided into 3 poles (2p), 4 poles (3p) and 5 poles (3p n).7. Appearance and modelingIn order to meet various needs, the outlet shapes are straight inclined, square, small flange, etc.8. Input socket of phase inverterThe rated current is 16 ~ 32a with inverter input socket, which can change the phase at any time.