Art T8 Transformer Isolator

Is the Art T8 Transformer Isolator good for preventing phantom power getting to my kit? Seems like a 'check the manual' no brainer, but I've read the thing cover to cover and there's no mention of exactly what it isolates - signal, voltage?? I'm sure to a professional it's very obvious, but I can't be sure it'll do the job I want it to do, and to halt phantom power before it gets to my Behringer mixer.
 
I'm planning to use it for four feeds which are directly or indirectly linked between my iem mixer and the venue desk - my keyboards, shimmer, backing vocals and main vocals. The problem has been that when phantom power finds its way to my Behringer Ultralink Pro 882 it completely shuts the channel down! It does not like the phantom power! I also want to protect my Axe Fx from phantom power as I'm sending the desk my acoustic & shimmer sound straight from the balanced outputs. Is this for sure the right piece of kit?
 
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