... highly complex, multi-ATS/generator switchgear systems. Available in sizes ranging from 40 through 4000A, there is a SHX switch to suit ... . Overall features include:Mechanically held contactorAvailable in 2, 3, and 4 pole versionsRating range from 40 to 4000 AmpsNEMA 1, 3R, 4 ... , 4X, and 12 enclosures 40-3200a Automatic Transfer Switch