GenTran R3020 Power Center For Generators up to 7500 watts Combines a transfer switch and service entry equipment into one for an easy way to distribute generator power to your entire load center Aluminum, weatherproof NEMA 3r-rated cabinet won't rust in elements; distributes power supply to outbuildings such as a barn, dock or detached garage Includes power inlet for easy generator cord connection; distributes power supply to outbuildings such as a barn, dock or detached garage Includes 12 extra spaces to feed other appliances, subpanels or for disconnects Compact, lightweight design is 18-inches in length by 18-inches in width by 4-inches in depth is easier to install than other "knife" type switches