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Answer Posted / vikram singh
TPN means tripple pole + neutral....in case of MCB only, TPN
is call 4 Pole also....but in case of SDFU, MCCB, ACB etc
TPN means 3P+N, which means that 3Pole SDFU, MCCB ACB etc is
taken and nuetral busbar runs as 4th pole with it
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