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Is it possible to feed the supply from top (upstream) and bottom ( downstream ) in M asterpact NW range of ACB.

Masterpact NW (AC version) can be supplied either from the top or from the bottom without reduction in performance, in order to facilitate connection when installed in a switchboard. 
As per the design of the ACB, the internal CTs are designed in like this way that they can sense the current flow in both direction. So there is no influence of electrical characteristic for Masterpact NW in any direction of connection.
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