I'm in the UK so no issue with the voltage all 240 
Dear All
If thinking of buying this PSU for an S4 with the older M4 ring terminals, this is the reply I received from Bitmain.
Hello sir,
when you are making order,
you need to make a comment that you need M4 ring connectors. that way factory will prepare everything and ship.
but please be sure that they have understood you fully. and that you do not need bunch of 6 pins.
send them a picture if needed, that you require type 1 (m4's with one 6 pin). or red cables.
just be crystal clear. so they do not mix order.
Hope this makes it clear how to order
good luck
I just received my APW3-12-1600 PSU that I want to connect to my S4 that has the M4 ring connectors.
Even though I mentioned this when purchasing as suggested by support the PSU arrived with PCI connectors.
However I did come with a power adaptor board.
Can you send me instructions as to how to connect the original cables to this board.
Also the APW3-12-1600 PSU has 12 PCI connectors and the board has only 8 connectors.
Which ones do I use - some included instructions would be helpful or put it in the manual
Just sent this message to support.
The saga goes on
I knew that would happen with your order about the connectors. That is why I held off. They tell you to let them know that you need the ring term connectors but there is no place to do that when ordering that I'm aware of. And that they would install them for you. Does it fit ok in the case?
The controller is the board that is in front of the psu and has the one pci-e connector.