Parallax | 50 Amp Transfer Switch | ATS501 | 120VAC / 240VAC | 50 Amps | Screw TerminalsSwitch power sources seamlessly with the Parallax ATS501 50 Amp Automatic Transfer Switch, a dependable 120 240V solution built to handle the rigorous demands of RV, marine, and off grid electrical setups. The ATS501 automatically routes power between your active sources typically shore power and generator without any manual intervention, so your appliances and onboard systems keep running without missing a beat. Reliable, Automatic Power Management