The Briggs & Stratton 71047 100-Amp 16 Circuit Transfer Switch is for use with Air Cooled Standby Generators. This model features overload protection and lets you control up to two AC Units. Includes (2) 50-Amp, (1) 40-Amp, (1) 30-Amp Double Pole and (8) 20-Amp Single Pole. Patented AC Control Module. For more than a century, Briggs & Stratton branded engines and power equipment have helped consumers get the job done. Known for hard-working, dependable, efficient products, Briggs & Stratton is the world's largest producer of gasoline engines for outdoor power equipment. Briggs & Stratton products are designed, manufactured, marketed and serviced in over 100 countries on all seven continents. Visit www.amazon.com/briggsstratton for more information on Briggs & Stratton and our extensive line of products.