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I have Schneider 4P Circuit Breaker Model NSX630H with trip unit Micrologic 2.3 installed on it. I want to use this breaker for the three phase network where Neutral is not applicable.

You can use a 4 pole breaker in a 3 phase 3 wire network leaving the neutral pole blank. Set the Micrologic to ( 4P3D ) setting.
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