Generac RTSW100A3 100-Amp 120-240V Single Phase Nexus Automatic Transfer Switch with Service Disconnect, Rated NEMA 3R 100-amp 120-240-volt single phase nexus transfer switch with service disconnect NEMA 3R rated aluminum enclosure Transfer switch connects through the utility meter for easy installation Engineered with Generac's digital load management (DLM) technology Comes with a 2-year limited warranty