The Parallax ATS line generator switches are the strongest in the industry and is the most trusted way to trasfer power between shoreline and RV generators. The ATS301 is specifically designed for 30 Amp, 120V electrical systems. Users benefit from not having to handle plugs or electrial cords to transfer power. Other features include UL type 1-16 GA steel and conforms to UL Std. 1008 (CSA C222#178.AEI)