The Quattro can be connected to two independent AC power sources, for example shore power or a generator, or to two generators. It will automatically connect to the active power source. The main output has a "no-break" function. The Quattro takes over power to the connected loads in the event of a blackout or shore power/generator disconnection. This happens so quickly (less than 20 milliseconds) that computers and other electronic equipment continue to operate without interruption. Three units can be configured for three-phase output.