"This Generac Manual Transfer Switch allows you to power the entire load center so you can turn off selected loads. Includes extra spaces for up to 12 branch circuit breakers for feeding generator power to outbuildings. U.S.A. Circuits qty. 12, Amps 200. Installs outside next to utility meter Lockable NEMA 3R aluminum enclosure Includes 200 Amp utility main, 50 Amp generator main and 50 Amp male power inlet"