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Anonymous
Basically tpn means the tripple pole + nutral protectin mbc .
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diffrence between 1 pole and 2 pole mcb is one pole is extra in 2 pole
Diffrence between TPN MCCB and 4P MCCB
TPN is same as 4P MCB TPN means Three Pole and Neutral - four pole MCB. 4P is four pole MCB