Hi I wonder if any of the bright sparks (pun) could enlighten me on the settings of a Merlin Gerin NSX 400N Circuit breaker there are 3 settings Io, Ir and Isd the first one is the current setting not too sure what the other two are, could be tripping curves. I have tried to look it up on the net but there are a multitude of options except the one I want
Thanks
Mike
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