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

what is a 3 phase power formula ?

5 Answers  

use of PIR in ehv breaker

0 Answers  

1.In two wattmeter method if one wattmeter shows Negative reading then wat is reason? 2.Wat is the reason for low voltage in houses? 3.Wat is meant by current and voltage? wat is difference between the two?

10 Answers   Engineering,

we all know that corona is nothing but ionization of air around the conductor and there by allowing current to pass through ionized air.but we are not getting any short circuit in between the respective phases though the air turned as a conductive media between them??

1 Answers   Siemens,

Advantages of using generator circuit breaker (GCB) scheme in a power station ?

0 Answers   Gridco,

In D O l starter motor starts as a star connected ,then in star delta starter also motor initially starts as star how come star delta is preferred from dol

2 Answers  

How can we prevent the (Home)inverter supply flow to the main supply line?

1 Answers   L&T,

why US countries maintains 110v and 60HZ

0 Answers  

If DG runing time neutral is disconnected what will be the effect in Engine and Electricial panel.

2 Answers   HP,

why normally Generator rating are between 11Kv to 22Kv?

7 Answers   Torrent Power,

what is the safe meggar values for motor, transformer HT, LT and Cables?

12 Answers   IOCL, Jindal, TATA,

i have done diploma and btech in EE and live in Chandigarh so kindly help me how can i make my competency certificate in my area.

0 Answers   Multi Metals, ONGC,