Hubs can only work with one power supply: standard or alternative (6V PSU (type A), 12V PSU for Hub 2/ReX 2¹ or 12-24V PSU (type A)).
¹ Discontinued product
How to connect the hub so that it works from 110–240 V~ and switches to 6, 12 or 24V⎓ in case of power outage
Updated