Answer / asif mansoori

As for SFU is concerned, TPN will mean triple pole with
Neutral. For MCB, MCCBs, TPN will mean a 4Pole device with
4th Pole as Neutral. In TPN, opening & closing of the
device will open & close the Neutral. While in SFU,
Neutral doesn't automatically opens or closes as it does in
case of MCBs or MCCBs. In MCBs & MCCBs, protection is only
on Three poles & Neutral is just a isolating pole. For
application where TP MCCB or MCB is used in 3ph4wire
system, it is denoted as TP+N which will mean a three pole
device with external neutral link which can be isolated if
required.

Answer / eknath

T.P.N. is a type of s.f.u. triple pole unit with nuetral.

Answer / 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

Answer / nick j

TP&N in Switchgear when reffering to a switch, MCCB,ACB, Disconnector means triple pole device with fixed neutral link
which Isolatable by removing the link in the neutral
4 pole means all poles of switch open when operated

Answer / ali

630A TPN ISO and 125A,25KA TPN MCCB

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