GE AK-50 Series - Page 21

Low
Voltage
Power
Circuit
Breakers
GEK
-
7303
1
.
With
outside
poles
open
,
loosen
adjustment
plate
(
10
)
of
center
pole
on
crossbar
(
9
)
by
freeing
bolt
locking
tab and
loosening
bolts
(
11
)
.
2
.
If
center
-
pole
wipe
or
overlap
is
to
be
increased
,
move
the
adjustment
plate
to
the
left
;
if
it
is
to
be
decreased
,
move
it
to
the
right
.
3
.
After
proper
adjustment
is
made
,
tighten
adjustment
plate
bolts until
plate
is
snug
.
Then
tap
adjustment
plate
in
such
a
way
as
to
bring
lower
edge
of
slot
in
plate
to
bear
against
bolt
.
Tighten
bolt until lockwasher
is
fully
compressed
.
Then
form
locking
tabs
over
bolt heads
so
that
bolts
are
securely
held
in
place
.
NOTE
:
If
the above
adjustment
has
been made
,
it
is
necessary
to
recheck the
outer
-
pole
wipe
.
If
this
is
outside the
prescribed
limits
,
correct
as
described
in
POLE
UNIT
ASSEMBLY
.
contacts
.
5
.
Check
contact
overlap
and
wipe
,
and
re
-
adjust
if
necessary
(
see
above
)
.
Movable
Contacts
(
Fig
.
17
)
1
.
Remove
arc
quencher
(
see
ARC
QUEN
-
CHER
^
2
.
Remove
tru
-
arc
retainers
on
right
side
of
pins
(
7
)
and
(
16
)
0
30
Drift
pins
(
7
)
and
(
16
)
to
the
left
far
enough
to
free
movable
contacts
, ,
4
.
Reassemble
in
reverse
order with
new
contacts
.
5
.
Check
contact
overlap
and
wipe
and
re
-
adjust
if
necessary
(
see
above
)
.
4
.
If
proper
wipe
cannot
be obtained within
the
range
of
the
adjustment
described
above
,
it
will be
necessary
to
obtain further
adjustment
by
means
of
the
vertical
shims
(
14
)
provided
for
the
purpose
,
as
follows
:
9
BREAKER
OPEN
8
In
order
to
accomplish
this
,
proceed
6
a
.
Separate
the
front frame
from
the back
frame
(
see
SEPARATION OF
FRONT
AND
REAR
FRAMES
)
.
b
.
Loosen
screw
(
13
)
and
remove
bolt
(
15
)
.
c
.
Remove
vertical
shims
(
14
)
to
decrease
wipe
;
add
to
increase
.
d
.
Replace
bolt
(
15
)
and
tighten
screw
(
13
)
.
e
.
Reassemble
front
and back
frame
.
Adjusting
Center
-
pole
Open
Contact
Gap
(
Fig
.
17
)
Improper
open
contact
gap
of
the
center
pole
may
be
adjusted
by
the
following
procedure
.
1
.
Loosen
screw
(
13
)
and
bolt
(
15
)
.
2
.
If
gap
is
to
be increased
,
horizontal shims
(
14
)
should
be
removed
.
If
it
is
to
be decreased
,
they
should be added
.
Shims
may
be
removed
by
sliding
them
to
the
front
of
the
breaker
.
They
are
slotted
for
easy
removal
.
(
Effect
of
this
ad
-
justment
on
contact
wipe
and
overlap
is
negligible
.
)
3
.
Tighten
hardware
.
Contact
Replacement
Stationary
Contacts
(
Fig
.
17
)
1
.
Remove
arc
quencher
(
see
ARC
QUENCHER
)
.
2
.
Remove
screw
(
5
)
from
braid
.
3
.
Drift
out
pin
(
4
)
and
remove
contacts
.
4
.
Reassemble
in
reverse
order with
new
5
CLOSED
OPEN
C
:
3
4
1
.
Frame
2
.
Open
&
Closed
Indicator
3
.
Front
Eschutcheon
4
.
Cross
Bar
5
.
Operating
Rod
6
.
Triangular
Link
7
.
Link
8
.
Operating
Shaft
9
.
Auxiliary
Switch
w
'
Pj
Fig
.
18
(
0133
C
9020
)
Auxiliary
switch
linkage
-
standard breaker
AUXILIARY
SWITCH
AK
BREAKERS
(
Fig
.
18
)
The
auxiliary
switch
is
used
to
make and break
various
control
circuits
as
the circuit breaker is
opened
and
closed
.
The
auxiliary
switch
is
mounted
on
the left side
of
the
front
frame
.
As
the
crossbar
(
4
)
moves
,
with the
contacts
,
to
the
open
or
closed
position
it
operates
a
triangular
link
(
6
)
through
an
operating
rod
(
5
)
.
The
triangular
link
rotates
the
operating
shaft
(
8
)
of
the
auxiliary
switch
,
which
,
through
cams
located
on
this shaft
,
opens
and closes
the
auxiliary
switch
contacts
.
The
top
terminals
of
the
switch
are
"
a
”
contacts
(
open
when
the
breaker is
open
)
and the
bottom
terminals
are
"
b
"
contacts
(
closed
when the breaker
is
open
)
.
Replacement
(
Fig
.
18
)
1
.
Disconnect
all
leads
to
auxiliary
switch
.
21
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