Generac RTSW300A3 300 Amp Automatic Transfer Switch 120/240V 1 Phase Service Entrance Rated NewThe 300A Service Entrance Rated Automatic Transfer Switch with NEMA 3R aluminum enclosure and heavy duty Generac contactor, designed for single phase generators. Features service entrance disconnect for safe utility isolation and intelligent load management to control up to four HVAC loads without extra hardware, helping reduce generator size requirements. Outdoor rated for protection against weather and debris