Siemens GMI Series

Overhaul
9.4
Circuit
breakers
rated
2000
and
3000
amp
using
the
VS
10028
Interrupter
(
Figure
49
)
.
Remove
four
hex
socket
flat
head
screws
joining
the
insulating
support
plate
to
the
upper
primary
stab
sup
-
port
.
A
5
/
32
(
0.156
)
hex
key
and
7
/
16
back
up
wrench
will
be
required
(
hex
key
socket
preferred
)
.
These
screws
have
been
secured
with
a
thread
locking
adhe
-
sive
.
Preheating
the
fasteners
to
350
°
F
using
a
hot
air
gun
prior
to
breaking
them
free
is
recommended
.
Re
-
move
,
rejoin
and
save
fasteners
for
future
use
.
Using
a
24
mm
socket
and
extension
,
loosen
and
remove
the
hex
bolt
joining
the
tubes
stationary
contact
to
the
primary
extensions
.
Using
9
/
16
socket
and
extension
,
remove
four
3
/
8
hex
bolts
fastening
the
upper
primary
stab
support
to
the
red
post
insulator
Lift
and
remove
,
set
aside
with
care
.
This
item
is
heavy
,
and
two
people
may
be
required
to
safely
remove
.
10
,
Check
the
clamp
on
the
movable
contact
to
ensure
that
it
will
slide
freely
from
the
tubes
movable
stem
.
The
clamp
may
have
to
be
wedged
or
worked
open
in
order
to
slide
freely
from
the
tube
.
With
the
clamp
free
,
the
vacuum
tube
may
be
lifted
clear
of
the
clamp
and
pole
unit
structure
.
Note
:
Stationary
contact
is
annealed
copper
.
Thread
damage
will
occur
if
threads
are
crossed
.
Be
sure
the
bolt
can
be
fully
engaged
with
light
manual
torque
.
14.2
VS
10006
and
VS
10028
Interrupters
in
breakers
rated
1200
amp
(
Figure
47
)
.
With
the
tube
in
alignment
under
stab
support
,
place
the
primary
extension
into
the
gap
between
stab
support
and
tubes
stationary
contact
.
Make
sure
contact
sur
-
faces
are
wiped
clean
.
Replace
,
finger
tight
,
two
3
/
8
fasteners
joining
the
pri
-
mary
extension
to
the
stab
support
.
Insert
an
M
16
hex
bolt
through
lockwasher
,
washer
,
stab
support
and
primary
extension
Align
tube
stationary
contact
,
and
(
by
hand
)
engage
the
M
16
bolt
.
Note
:
Stationary
contact
is
annealed
copper
.
Thread
damage
will
occur
if
threads
are
crossed
.
Be
sure
the
bolt
can
be
fully
engaged
with
light
manual
torque
.
Vacuum
Tube
Replacement
11
.
Inspect
all
silver
plated
surfaces
for
cleanliness
.
Wipe
clean
with
solvent
and
clean
rag
.
Do
not
abrade
.
12
.
Insert
vacuum
tube
replacements
into
the
lower
stab
sup
-
port
with
the
evacuation
nipple
or
tubulation
oriented
as
follows
:
VS
12015
VS
25002
VS
10006
VS
10028
Fasten
two
3
/
8
fasteners
securing
the
primary
exten
-
sions
(
26
-
36
ft
-
lbs
.
)
14.3
VS
10006
Interrupter
in
2000
Amp
Breakers
(
Figure
50
)
,
With
tube
aligned
under
the
primary
stab
,
place
the
3
/
8
'
copper
spacer
between
primary
extensions
and
station
-
ary
contact
of
the
vacuum
tube
.
Insert
the
M
16
hex
bolt
through
a
lockwasher
,
washer
,
stab
support
,
primary
extension
and
3
/
8
"
copper
spacer
.
Align
vacuum
tube
stationary
contact
,
and
(
by
hand
)
engage
the
M
16
bolt
.
Tubulation
toward
primary
fingers
Tubulation
toward
primary
fingers
Tubulation
toward
mechanism
housing
Tubulation
toward
mechanism
housing
13
.
Slip
the
flexible
shunt
clamp
over
the
movable
contact
stem
of
the
interrupter
Replace
clamp
hardware
;
bolt
(
s
)
,
washer
(
s
)
,
and
nut
(
s
)
.
Raise
clamp
until
it
bears
on
step
or
retaining
ring
33
to
48
mm
up
from
the
end
of
the
stem
.
Note
;
Stationary
contact
is
annealed
copper
.
Thread
damage
will
occur
if
threads
are
crossed
.
Be
sure
the
bolt
can
be
fully
engaged
with
light
manual
torque
Note
:
Finger
tighten
only
I
Excessive
clamping
force
at
this
time
may
deform
movable
contact
stem
.
Later
in
this
procedure
a
trunnion
bolt
will
be
inserted
and
secured
.
After
this
bolts
insertion
and
adjustment
the
clamp
may
then
be
tightened
14.4
VS
10028
Vacuum
Interrupter
Applied
in
Breakers
Rated
2000
and
3000
Amperes
(
Figure
49
)
.
Allow
tube
to
rest
on
the
lower
stab
support
.
Replace
upper
primary
stab
support
with
primary
bus
extensions
.
Fasten
with
four
3
/
8
"
hex
bolts
to
the
primary
insulator
.
Use
3
/
8
bolt
,
lockwasher
and
washer
torqued
20
-
25
ft
-
lbs
.
Align
vacuum
tube
stationary
contact
.
Insert
M
16
hex
bolt
through
lockwasher
,
washer
,
upper
stab
support
and
primary
bus
extensions
.
Manually
engage
bolt
into
tube
by
applying
hand
torque
only
.
14
.
Stationary
Contact
Assembly
.
14.1
VS
12015
and
VS
25002
Interrupters
.
Align
copper
spacer
bar
with
large
hole
in
stab
support
.
Insert
long
M
12
bolt
through
lockwasher
,
washer
,
stab
support
and
copper
spacer
.
Align
tube
stationary
contact
and
(
by
hand
)
engage
the
M
12
bolt
(
Figure
48
)
.
32
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