【High-Quality & Safety】The interlock kit is made of aluminum alloy, the surface is anodized for better corrosion resistance, electrical insulation and heat insulation. Keep the main breaker and generator breaker from being ON at the same time Before buying, make sure the model number and spacing is correct. Generator Backup Power Interlock Generator Interlock Kit Compatible With Eaton Or Cutler Hammer Vertical Throw CH Series 150 Or 200 Amp, 2 1/4" Spacing Between Main And Branch Breakers 150 Amp 200 Amp Interlock This Interlock Kit Compatible with Eaton Cutler Hammer BR and CH Series Main 150 and 200 AMP Panels Interval Space Required:1 1/4 - 1 7/16 Inch Spacing between main and generator breaker Our generator Interlock Kit prevents utility and generator supplies from being on at the same time. 【Install Easily】The generator interlock kit offers a 3/16 drill bit, sturdy steel that goes through breaker panel easily. Diaotec Eaton Cutler Hammer Challenger BR-200 Generator Safely connect a generator to your Eaton CH & BR Series 150/200A breaker panel with this easy-to-install interlock kit! Made from aluminum alloy to prevent... It is truly a great way to safely connect up a generator while assuring that you have access to all of your home electrical appliances. 【100% Service】Any questions feel free to contact us.