The switch can operate with a single power source or with dual power sources. When both power sources are operational, the switch draws power from the DC source with the higher voltage. If one of the two power sources fail, the other continues to power the switch.
Check the following link for info how to wire the power cable.
I believe that you can use two AC/DC converter. But you have to connect them manually since there is no such DC power clip for the 2nd AC/DC converter.
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