Victron Energy VE Transfer Switch 5KVA, 1ph automatically switches between different power sources: between a generator and shore power, between an inverter and a generator or between an inverter and shore power.
The VE Transfer Switch has two inputs and one output, it automatically transfers the available AC power to the output.
The VE Transfer Switch is available in two models:
5KVA, single phase, 200-250Vac
10KVA, single phase, 200-250Vac
See manual here.