... ,1000A,1600A,3150A 4.Pole:3P,4P MGL Isolation-load switch cab be devided into 18 specs from 125A-4000A,it ... is the bacis type of module design,it has 3poles and 4poles(3poles+switch neutral pole),applied to make ... 8.210.417.8 4P4.54.58.711.320.2 Automatic transfer switch