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The type of motor safety protection is usually the beginning of IP, such as IP54, IP44 and so on, we will use the * number instead of these two numbers, namely: IP**.
0 no protective motor, no special protection, no experiment, but it should be fit for 2.1
1 door more than 50mm solid motor can avoid large area of the human body occasionally accidentally touched or near shell charged or rolling elements. Can avoid the solid foreign body into the shell diameter greater than 50MM
2 protection larger than 12MM solid motor can avoid the diameter greater than 12MM of solid foreign body into the shell
3 door more than 2.5mm solid motor can avoid diameter greater than 2.5mm things or wires touch or near shell in charged or rotating parts
4 door more than 1mm solid motor can avoid the diameter or thickness greater than 1mm wire or strip touching or near shell in charged or rotating parts
5 accept dustproof motor in any direction should be no harmful effects of splash
6 dust completely avoid the intrusion of foreign objects, and can completely avoid dust.