Generac 100A Indoor & Outdoor Automatic Transfer Switch is compatible with all Generac single phase generators Generac 200A Indoor & Outdoor Automatic Transfer Switch is required to automatically shut off the public utility and send power from the home standby generator to your home or dwelling. This transfer switch is service rated and can be directly connected to utility power. Service rated Automatic Transfer Switch with NEMA 3 standard allows this unit to be used both indoors or outdoors Digital Load Management (DLM) allows switches the capability to manage two air conditioners (heavier loads) with no additional hardware Features load shredding capabilities Ideal for smaller homes and cottages with 100 amp service breaker panel Load transition type - open transition Dimensions: 20" H x 14.6" W x 7.09" D (50.8 x 37 x 18 cm) Specifications: 120/240, single phase NEMA 3R CSA, 100A