1) Automatic Switching Capability This 100 Amp transfer switch automatically switches between power sources, engaging the backup source within 0.5 seconds during power anomalies to provide seamless and uninterrupted power delivery. 2) Manual Control Option Features a manual mode that allows users to easily select between power sources A and B with a userfriendly switch handle, offering flexibility and control for various situations. 3) Voltage Protection Features Equipped with overvoltage and undervoltage protection, this transfer switch automatically disconnects when voltage levels are outside the safe range, safeguarding connected devices and enhancing system reliability. 4) Compatibility Suitable for multiple power sources including mains, generators, and photovoltaic systems, making it for residential homes and RV applications. Use scenarios Home backup during blackout: When utility power fails, the switch automatically transfers to the backup source within 0.5 seconds, maintaining power to essential loads without interruption. RV or offgrid with solar PV: Can automatically or manually select between shore power, generator, or PVpowered sources to keep appliances running while optimizing charging and use. Protection during voltage fluctuations: Detects voltage swings and disconnects to prevent damage to sensitive electronics, then reconnects when voltage stabilizes.