Dimension Sheet
29-1 70M
Page 2
Westinghouse Series C® Molded Case Circuit Breakers, M-Frame, 400-800 Amperes
Type MD Two- and Three-Pole Breakers, Drilling Plans
For Plug-In Block
.375(9.52)
Diameter
5 500
(6) Holes
I--
... 2 7520).j.(69 82)
(41 26)
(69 8
'
+-- L_
I
I
11 500
I
I
1.625
(41.26)
I
(114.26)
r-·--
1 .063 R
(26.98) R
I
j
�
1.375
�
(34.91)
2.750
(69.82)
Terminal Arrangements
Cable
Catalog
Ampere
N umber
Rating
For use With Copper Cable Only
Single
T350MA
125-350
Double
T600MA1
400-600
Triple
T800MA1
700-800
For Use With AI/Cu Cable
Double
TA700MA1 1 25-600
Triple
TA800MA2 700-800
Reproduced from drawing
4570265
Cutler-Hammer
Westinghouse
&
Cutler-Hammer Products
Five Parkway Center
Wire
Size
#1-600 MCM
2/0-500 MCM
3/0-300 MCM
#1-500 MCM
3/0-400 MCM
Pittsburgh, Pennsylvania, U .S.A. 1 5220
I'!Y•N
For Rear Connected Studs
(For Non-Conductive Panels)
'
'
7.00
I
{177.73)
Handle
�
,
_
�
_
eli
I
4.500
I
(114.26)
For Mounting Bolts
1
...
2.750 1-
1 .375 (69.82)
.375 (9.52)
(34.91) ,
1.375
4-
(4) Holes
(34.91)
I
I
-i
I
. I .
I
·
I
8.625
I
1
I
(218 99)
'I I I'
. a;l '
Front Cover Cutout
7.750
(196.77)
(�nk-�
3.500
Cutout for
(88.87)
Saf-T-Vue Cover
1.625
(If Required)
__
(41
r
l
-
_
3.938
(99.97)
_j__
Recommend
.750 ( 1 9.04)
Diameter Hole
tel
Show Ampere
Rating
I !I
i �. I
Location of .313(7.93) Diameter
Megger Holes ( If Required)
.563 ( 1 4.28) Diameter Hole
for 125to225Amps
.813 (20.63) Diameter Hole
for 250to400Amps
1 .063(26.98) Diameter Hole
for 450to600Amps
Rear Connected Studs
1 . 1 88 (30.1 5) Diameter Hole
for 700 to800Amps
6 Holes for 3 Pole Breaker
4 Holes for 2 Pole Breaker
Omit 2 Center Holes
for 2 Pole Breaker
Plug-In Adapter Kit
Stud Ampere
Stud Style
Thread
Dimension
Poles
Ampere
Rating
Number
Size
1 25-225
31 4C960G01
'/,-13
250-400
31 4C960G04
'/,-1 6
250-400
31 4C960G05
'/,-1 6
250-400
31 4C960G06
'/,-1 6
450·600
31 4C960G07
1 - 1 2
450-600
31 4C960G08
1 - 1 2
450-600
31 4C960G09
1 - 1 2
700-800
31 4C960G 1 0
1 '/,-1 2
700-800
3 1 4C960G 1 1
1 '/,-12
700-800
3 1 4C960G 1 2
1 '/,-12
.375(9.52)
·
24 Thread
A
321/32
529/32
813/32
1 029/32
529/32
813/32
1 029/32
529/32
813/32
1029/32
Rating
2
125-600
3
125-600
2
700-800
3
700-800
.375(9.52) · 24 Thread
Figure
1
(Plug-In Type)
Do Not Use More
Than 25 Ft. Lbs.
Torque To Tighten
Nuts
Kit Style
Number
31 3C644G27
31 3C644G28
176C544G01
176C544G02
Dimensions in parentheses in millimeters
Figure 2
(Front Removable Bolted Type)
Thread
Size
1 '/,-12
1 '/,-12
1 '/,-1 2
1 '/,-12
Fig.
Printed in U.S.A.
January 1995
www
. ElectricalPartManuals
. com
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