The Southwire Surge Guard 40430RVC1 Transfer Switch is a permanent switch that connects to your power box that changes the power load between two sources. Featuring shore power sensing, this switch transfers to generator power automatically when energized after 30 second delay (generator mode). When both shore and generator power are available, generator dominates after a 30 second delay. Once generator shuts down, shore power activates after 3 second delay.• Total electrical protection from faulty park power.• Provides protection against power surges, open ground, open neutral, low and high voltage, reverse polarity, and high and low frequency.• Multi-mode surge suppression.• RVC communications allow instant display of voltage, current, and fault conditions on an RVC compatible device• RVC network communication of both generator and shore power availability through exclusive shore power sensing technology• Allows the RVC network to better control the power source of the RV and reconnect with shore power when it's available• Fault log retrieval through RVC network• Indicator lights on front of ATS indicate presence of input power for L1 and L2• Voltage and current continuously monitored and indicated• UL approved 1008 full transfer switch rating and UL/CUL listedSpecificationsAmps: 30AHertz: 60 HzMax Spike Current: 134, 000AMis-Wired Indication: YesOver/Under Voltage: YesReverse Polarity Protect: YesRVC Compatible: YesTime Delay at Power Up: 2 min. 15 sec. UL Approval: UL 1008Voltage: 120V Once generator shuts down, shore power activates after 3 sec. delay Total electrical protection from faulty park power Multi-mode surge suppression | Southwire 40430RVC1 30A Automatic Transfer Switch