GE AM-4.16-250-6 - Page 22

GEI
-
88761
Magne
-
blast
Circuit
Breaker
CONTACTS
Open
the
breaker
and
remove
the box barrier
and
interrupters
as
previously
described
.
To
remove
the
contacts
,
proceed
as
follows
:
A
.
Stationary
Arcing
Contacts
(
10
)
Figure
22
.
1
.
Disconnect
the
contact
braids
(
7
)
from
the
contact
fingers
by
removing
two
bolts and
locking
plates
(
8
)
.
2
.
Grasp
the lower
end
of
the
contact
fingers
with
pliers
and
pull
contact
assembly
downward
to
remove
from
stud
assembly
.
3
.
To
disassemble
braids
from
stud
plate
remove
one
bolt
(
5
)
.
4
.
To
disassemble
stud
plate
from
contact
support
,
remove
two
bolts
(
6
)
.
5
.
Reassemble
in
the
reverse
order
,
make
sure
locking
plates
are
properly
re
-
assembled
with
bolts
(
8
)
.
B
.
Movable
Arcing
Contact
(
14
)
Figure
23
.
1
.
Remove
the
assembly
bolts
(
12
)
making
note
of
quantity
and
location
of
shims
and
spacers
used
between
contacts
and
contact
arms
.
2
.
Reassemble
in
reverse
order
,
re
-
using
the
shims and
spacers
.
3
.
Close
the
breaker
slowly
to
check
that
the
movable
arcing
contact
is
approximately
centered
on
the station
-
ary
arcing
contact
and
that
it
does
not
rub
on
either
side
of
the
throat
barrier
(
9
)
.
NOTE
:
Whenever
it
is
found
necessary
to
replace
arcing
contacts
on
any
pole
of
a
breaker
it
is
recommended
that
both the
stationary
and
movable
con
-
tacts
on
that
pole
be
replaced
at
the
same
time
.
C
.
Stationary
Primary
Contacts
(
9
)
Figure
24
.
1
.
Compress
the
contact
spring
(
6
)
by
use
of
the
spring
compressor
.
2
.
Remove
spring
and
spring guide
(
1
)
.
3
.
Raise
the
contact
finger
to
clear the
primary
contact
stop
plate
(
8
)
and
lift
the
finger
out
of
contact
support
(
7
)
.
Remove
one
contact
finger
at
a
time
.
To
replace
the
Stationary
Primary
Contacts
:
Figure
20
.
(
8039604
)
Interrupter
Assembly
1
.
Upper
Mounting
Support
2
.
Connection
Bolt
3
.
Insulation
Plate
4
.
Upper
Arc
Runner
Assembly
5
.
Side
Shield
6
.
Lower
Arc
Runner
Assembly
7
.
Lower
Coil
Connection
8
.
Connection
Nut
9
.
Lower
Mounting
Support
1
.
Apply
a
thin
coating
of
D
50
H
47
grease
on
the
hinged edge
of
the
finger
(
9
)
then
place
it
on
the
contact
support
(
7
)
so
Figure
21
.
(
8029373
)
Arc
Chute
Fin
Spacing
22
Courtesy of store.ips.us