Classification:
¡¡¡¡According to application:single power switch;2-powers or 2-circuits shifting switch(p);3-circuits shifting switch(S) 
4-circuits shifting switch(G);controlling switch for minor capacity motor(N).

According to installation board:wiring before board;wiring behind board.

According to amount of poles:single-pole,2-poles,3-poles,4-poles.

According to amount of joints:1 joint,2 joints, 3 joints, 4 joints, 5 joints, 6 joints.