SouthWire Corp. Power Transfer Switch - 30 Amp Shore And RV Generator - 41300-001This Surge Guard model is a basic automatic transfer switch. It is generator dominant and transfers to generator power automatically when energized after 30 second delay. Once the generator is shut down, shore power activates after a 3 to 4 second delay. Type: Automatic Function: Transfer Power Between Shore And RV Generator Voltage: 120 Volt AC Ampere Rating: 30 Amp Terminal Type: Screw Length (IN): 5. 58 Inch Width (IN): 3. 31 Inch Height (IN): 7.