Adding an MCB to inadequate cable is pretty much useless, your cable and wires must be able to handle more than what the MCB can handle, if you use a 10A cable on S17e then you are simply asking for trouble, the 2700w on Bitmain's website (you pasted the wrong link by the way) is based on 220V which means the miner pulls 12.27A constantly if your voltage drops to say 200 then it will pull 13.5A, and even at 240V which is the max input voltage the miner will still draw 11.25A, by all means unless you underclock the miner then 10A cable isn't what you want to use.