Generac 200Amp Service Entrance Rated Smart Automatic Transfer Switch (RXSW200A3) Voltage: 120/240 Single (1ø) Phase Nema 3R ETL rating: cETLus Featuring a NEMA 3R aluminum enclosure and Heavy Duty Generac Contactor, this Service Entrance switch is designed for use with single phase generators.  Using the integrated load management technology, four individual HVAC loads can be managed with no additional accessories required.This switch features a 5 year limited warranty. Â