GE AK-50 Series - Operating Mechanisms; Electrically and Manual Operating Mechanisms

Low
Voltage
Power
Circuit
Breakers
GEK
-
7303
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i
—
2
—
L
9
3
-
—
j
4
i
8
5
-
3
^
fVlO
,
6
J
i
.
.
.
'
3
3
Fig
.
8
(
8014678
)
Front
view
of
back
frame
assembly
-
AK
-
2
-
50
6
.
Crossbar
7
.
Series
Overcurrent
Device
8
.
Movable
Inter
-
mediate
Contact
9
.
Stationary
Inter
-
mediate
Contact
1
.
Stationary
Arcing
Contact
2
.
Movable
Arcing
Contact
3
.
Stationary
Main
Contact
4
.
Clamp
5
.
Movable
Main
Contact
Fig
.
9
(
8039669
)
Front
view
of
back
frame
assembly
-
AK
-
3
-
50
1
.
Power
Sensor
Coil
Assembly
2
.
Disconnect
Plug
3
.
Transformer
Taps
in
Amperes
spring
load
on
pin
(
25
)
is
relieved
.
5
.
Remove
pin
(
25
)
and
screws
(
27
)
and
lift
out
contacts
.
ing
contact
replacement
.
(
See
ADJUSTING
CONTACT
WIPE
AND
PRESSURE
)
.
OPERATING
MECHANISMS
ELECTRICALLY
OPERATED
AK
-
50
,
-
75
and
-
100
;
MANUAL
AK
-
50
The
electrically
operated
mechanism
includes
a
motor
and
a
gear
reduction
unit
,
which
charges
the
closing
springs
(
16
,
Fig
.
10
)
through
a
crank
shaft
(
14
,
Fig
.
10
)
.
The
crank
shaft
has
an
arm
with
a
roller
(
12
,
Fig
.
10
)
which
rides
on
the
closing
cam
(
2
,
Fig
.
11
)
.
closing
cam
roller
is
shown
in
Fig
.
11
A
,
11
B
,
and
11
C
.
center
-
pole
unit
through
a
clevis
and
through
a
crossbar
it
controls
the
opening
and
closing
of
the
contacts
on
all
pole
units
.
Charging
the
Closing
Springs
(
Fig
.
10
)
6
o
Reassemble
contacts
in
reverse
order
,
being
careful
to
replace
the
intermediate
contact
in
the
proper
position
.
Movable
Intermediate
and
Main
Contacts
(
Fig
.
6
)
1
.
Remove
the
movable
arcing
contacts
as
described
above
.
The
position
of
this
2
.
Loosen
spring
(
17
)
.
3
.
Remove
braid
if
present
by
removing
screw
at
bottom
of
contact
.
The
closing
cam
is
connected
to
the
4
.
Slide
link
(
12
)
to
the
side
and
off
of
pin
(
7
)
.
The
mechanism
in
position
is
shown
in
1
.
5
.
Slide
pins
(
7
)
and
(
18
)
far
enough
to
the
side
to
allow
the
movable
intermediate
contacts
to
be
replaced
.
Fig
.
11
A
.
2
.
The
motor
turns
the
crank
(
10
)
which
is
mounted
on
the
output
shaft
of
the
gear
reduc
-
tion
unit
.
The
charging
roller
,
which
is
on
the
face
of
the
crank
,
has
paddle
arm
(
11
)
bearing
on
it
.
6
.
Reassemble
parts
in
reverse
order
.
Always
check
contact
wipe
and
pressure
follow
-
13
Courtesy of NationalSwitchgear.com