Generac RXG16EZA3 100 Amp Automatic Transfer Switch NEMA 3R With 16 Circuit Load Center NewThis Generac automatic transfer switch is designed to operate with air cooled generators. It has an integrated load center to allow for essential circuit backup. It is especially useful where the main service is large and only a portion of the building will be served by the generator or when the main electrical breaker panel is located outdoors. Comes standard with a 16 circuit breaker panel that can be populated with the appropriately sized breakers