October, 1 977
Westinghouse Electric Corporation
Low Voltage B reaker D ivision
Beaver, Pen nsylvania 1 5009
Type N B and M A R K 7 5® Type H N B
D i mension Sheet
29-1 70
Page 3 5
S u persedes D i mension Sheet 2 9 - 1 70
all previous issues.
Page 35: Type N B, M A R K 7 5® Type H N B
Page 36: M o u nting B lock for Type N B,
M A R K 7 5 H N B, S E LT R O N I C™ Types NC,
M A R K 7 5 H N C
AB DE
-
ION
®
Ci rcuit Brea kers
M a i led to: E, D, C/1 901 , 1 928, 1 929/ P L
Type N B, MARK 75® Type H N B B reakers
9!
4
14
�
I
16
I
2�
3
2;;
!a
'
�
-
--
-· ···•
.
'
'
0
"
I
"
32
�-13 Tap
1
3
16
M
o
gn
e
11
c
f
Current Corry1nq Parts
Om1tled from
Center
Pole
for
2
Po
l
e Breaker
Drilling Plans
For Mounting Bolts
( F ront Connected Terminals)
3
or
-<1
,
;
4
18
Top
Line End
r·
F
I
I
,
'!_ Hoodle
L
I
I
Load End
ct.
Breaker
Reproduced F rom Drawing 371 0578
F ront Connected Terminals
Ampere
Catalog No.
Wrre Srze
Rating
For Copper Cable Only (Supplied as Standard)
700- 1 000 T 1 000 N 8 1
Tnple Cable 3/0- 500 MCM
1 200 T 1 200 N B 1
Four
C a ble
3 / 0 - 400 M C M
For AL/CU C a ble ( M u st Be S pecified)
700- 1 000 TA 1 000 N 8 1
Tr�ple C a ble
3 / 0 - 400
MCM
1 200 TA 1 200 NB1 Four Cable 4/0- 500 MCM
1 200 TA 1 20 1
N B
1 Tnple Cable- 500-750 MCM
For Rear Connected Studs
( Insulated Panel)
2 Pole Breaker
Line End
I
I I
7
I
I I
'
I
i l l
l
--Ti'i_Hoodle
Load End
-<!r--� ._1
t_
Breaker
Style No
A
6238222G01
5V,
6238222G02
8
623822 2G03 1
O V,
B olted Rear Connected Studs
For
700
to
800
Amps
Omrt from Center Pole
for
2
Pole Breaker
Style No
A
623B222G01
5V,
623B22 2G02 8
6238222G03 1
O Y,
1�·12
Threads
For
900
to
1 200
Amps Only
r -
l inch
Mtntmum
Insulated
Panel
Oulstde Poles Stud
Style Number
3738375G04
Cente• Pole Stud
Numbe r 3 7 3 8 375G03
( Omtt for
2
Pole Breaker)
Front C over C utout
3:t
L_
Recommend
�
----
Q,ameter Hole
ta St1aw
Amp
3
t_Breoker
�
Dtameter Megqer Holes
of
Requored
't_
Handle
Load End
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