Between the 3 phases it only allows to get maximum 220V so it is a device for 3x110-120V. It is NOT meant for real 3x220V (380V) or 3x230V (400V). It do NOT match with the European voltage standards, despite the customer support statement. After the confirmation of the customer support, I have tried to connect that to 3x230V and it exploded. Overvoltage protection reach for only +15%.