Install a ZPCT (Zero Phase Current Transformer). It is very good and able to protect your system from short circuited. Any unbalance current will trip your MCCB.
It also able to protect your earth leakage current due to unbalance current in your 4 wire system. Installation is easy and simple.
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Management is just like a bunch of Monkey sitting on a tall tree. Some climb to the highest branch and some at the lowest branch. The highest Monkey look down and see a lot of happy faces but the lower Monkey looks up and see nothing but all the....
Yes there are, but can you explain your application more clearly (especially since you answered the first part of your question yourself in the title of your thread).