GE AK-50 - Movable Contacts and Auxiliary Switch; Movable Contact Replacement; Auxiliary Switch Function and Replacement; AK Breaker Auxiliary Switch

GEI
-
74600
Low
-
voltage
Power
Circuit
Breakers
Movable
Confects
(
Fig
.
16
)
1
.
Remove
arc
quencher
(
see
ARC
QUENCHER
)
.
8
I
-
16
V
9
\
15
7
2
7
D
;
s
)
10
§
s
'
i
3
N
2
.
Remove
tru
-
arc
retainers
on
right
side
of
pins
(
7
)
and
(
16
)
.
3
.
Drift
pins
(
7
)
and
(
16
)
to
the
left
far
enough
to
free
movable
contacts
.
i
3
II
o
J
)
12
*
»
-
14
0
i
4
V
3
)
>
4
V
.
13
j
4
.
Reassemble
in
reverse
order
with
new
contacts
.
6
5
13
.
'
b
1
Contacts
14
.
’
b
'
Terminals
15
.
‘
a
*
Terminals
16
.
Barrier
9
.
Contact
Spring
10
.
Rocker
Arm
11
.
Pin
12
.
Cam
5
.
Check
contact
overlap
and
wipe
and
readjust
if
necessary
(
see
above
)
.
5
.
Bottom
Cover
6
.
End
Plate
7
.
Top
Cover
8
.
'
a
'
Contacts
Fig
.
18
.
Auxiliary
switch
—
standard
breaker
1
.
Mounting
Bolt
2
.
Tie
Bolt
3
.
Shaft
4
.
Screw
AUXILIARY
SWITCH
AK
BREAKERS
(
Fig
.
17
)
4
.
Set
arrow
on
new
auxiliary
switch
The
top
terminals
of
the
switch
are
"
a
”
contacts
(
open
when
the
breaker
is
open
)
and
the
bottom
terminals
areMb
”
contacts
(
closed
when
the
breaker
is
open
)
.
shaft
.
The
auxiliary
switch
is
used
to
make
and
break
various
control
cir
-
cuits
as
the
circuit
breaker
is
opened
and
closed
.
5
.
Push
auxiliary
switch
shaft
(
8
)
into
square
hole
in
link
(
breaker
open
)
.
6
.
Replace
mounting
hardware
and
wiring
.
The
auxiliary
switch
is
mounted
on
the
left
side
of
the
front
frame
.
As
the
crossbar
(
4
)
moves
,
with
the
con
-
tacts
,
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
.
Replacement
(
Fig
.
17
)
1
.
Disconnect
all
leads
to
auxiliary
switch
.
Adjustment
(
Fig
.
17
)
The
"
a
"
contacts
of
the
auxiliary
switch
should
close
before
the
arcing
contacts
of
the
breaker
close
.
This
may
be
checked
by
slowly
closing
the
2
.
Remove
two
mounting
bolts
.
3
.
Disengage
auxiliary
switch
shaft
(
8
)
from
the
triangular
link
(
6
)
.
9
BR EAK ER
OPE N
8
7
6
BREAKER
1
.
Pin
2
.
Switch
Mounting
Bolt
3
.
Auxiliary
Switch
Shaft
4
.
Crossbar
5
.
Operating
Rod
6
.
Link
7
.
Bolt
8
.
Link
9
.
Locknut
10
.
Link
11
.
Triangular
Link
12
.
Link
t
-
/
2
\
,
CL OS ED
—
.
5
-
re
{
/
.
7
.
OPEN
i
)
3
4
/
r
1
.
Frame
2
.
Open
and
Closed
Indicator
3
.
Front
Escutcheon
4
.
Crossbar
5
.
Operating
Rod
6
.
Triangular
Link
7
.
Link
8
.
Operating
Shaft
9
.
Auxiliary
Switch
I
*
Courtesy of NationalSwitchgear.com