This Surge Guard model is a basic automatic transfer switch. Basic automatic transfer switch automatically transfers RV to generator power 30 seconds after generator start-up to ensure generator output voltage is stable before powering appliances and accessories. Transfers to shore power after 3-4 second delay after generator shuts down when you are connected to shore power pedestal. 120 volts, 30 amps, 60 Hz. | Southwire TRC 30 Amp Automatic Transfer Switch