The ATR is a three-insulator double center break, outdoor, air disconnect switch con- structed primarily of aluminum; available in ratings from 138kV through 500kV nominal (145kV through 550kV maximum) at 2000 and 3000 continuous amperes. This unique design incorporates triple insulator rotation for better weight distribution along with our “tried and true” center break blade contact assembly found on our AGCH5 unit