NOT KNOWN DETAILS ABOUT 230 TO 12 VOLT TRANSFORMER

This my be my stupid dilemma, he reported the device is 460 s why does he require a 480/277 Wye secondary? He doesn't show needing a neutral, but if he results in it he must operate it. Doesn't make perception to me.I have two European appliances and I am unable to use it in the US. So I acquired this voltage converter from this vendor. Much like T