GE AK-50 Series - Stored-Energy Manual Mechanism

Low
Voltage
Power
Circuit
Breakers
GEK
-
7303
used
on
the
AK
-
50
,
-
75
and
-
100
electrical
breakers
.
The
closing
springs
(
5
)
are
charged
by
operating
the
manual
closing
handle
(
22
)
on
the
front of
the
breaker
,
instead
of
the
closing
motor
as
is
the
case
with the electrical breaker
.
Closing
this
breaker
is
accomplished
by pumping
the
operating
handle
four
complete
cycles
,
first
counterclockwise
through
120
degrees
from
its
normal
vertical
position
and then
clockwise
back
through
120
degrees
from
its
normal
vertical
position
and
then
clockwise back
through
120
degrees
.
When
approximately
70
degrees
of
the
fourth
clockwise
stroke
have been
completed
,
the
closing springs
,
which have been
charged during
the
previous
strokes
ot
the
closing
handle
,
are
driven
over
-
center
and the breaker
closes
.
t
RELEASE
ARM
o
/
v
ARMATURE
-
3
J
2
Q
°
4
M
0
G
0
/
LEVER
MAGNET
This mechanism consists
basically
of
a
closing
spring
assembly
,
ratchet
wheel
and
output
crank
assembly
,
handle shaft and
pawl
assembly
,
and
the
closing
handle
.
Fig
.
14
C
Closing
the Breaker
(
Fig
.
15
)
The first
stroke
of
the
closing
handle
causes
the ratchet
pawls
(
21
)
attached
to
the
handle shaft
(
23
)
,
to
engage
the first
tooth
of
the ratchet
wheel
(
17
)
,
thus
beginning
to
charge
the
closing springs
.
The
subsequent
closing
handle
strokes
perform
the
same
function
as
the
pawls
(
21
)
engage
the
teeth
in
the ratchet
wheel
(
17
)
,
thus
rotating
the
ratchet
wheel and
output
crank
(
32
)
and
completely
charging
the
closing
springs
.
This rotation
of
the ratchet
wheel
and
output
crank
is
in
a
counterclockwise
direction
from
the lower
position
,
through
slightly
more
than
180
degrees
,
to
a
position
just
beyond
dead
center
,
In
this
position
the
closing
springs
are
free
to
release their
energy
,
closing
the breaker
at
a
high
speed
.
Release
Shaft
Stop
and
Switchette
-
Fig
.
14
C
Adjust
screw
”
E
”
to
1
/
32
”
clearance
between
screw
and lever with clearance
on
release
arm
taken
up
by
pressing
lever
lightly
forward
.
Adjust
switchette
operation
by
adding
washers
”
F
”
under
cotter
pin
,
so
that
contact
is
made
when
armature
is
adjusted
as
shown
above
.
The
control
relay
or
(
X
)
relay
is
located
on
the
left
side
of
the
front frame
channel
.
It
may
be
removed
by
disconnecting
the
wiring
,
loosening
the
(
3
)
two
mounting
screws
and
lifting
it
slightly
to
admit
the
top
mounting
screw
through
the
keyhole
mounting
,
in
general
,
the
entire
relay
should
be
replaced
rather
than
changing
coils
and
contacts
.
Inserting
the
Safety
Pin
(
Fig
.
15
)
If
it
is
desired
to
slowly
close the breaker
contacts
to
check
contact
wipe
and
sequence
,
operate
the
closing
handle
3
1
/
2
as
described above
,
counterclockwise
stroke and before
performing
the
fourth clockwise
stroke
,
insert the
safety
pin
(
3
)
into
the
hole
(
4
)
in
the
guide
rod
(
6
)
,
thus
preventing
the
closing
springs
(
5
)
from
releasing
their
energy
to
close the breaker
contacts
.
Replacement
(
Fig
.
15
)
If
it
is
necessary
to
replace
any
of
the mech
-
anism
parts
,
the
following
total
procedure
is
recommended
,
at
the
step
required
to
replace
any
particular
part
:
complete
cycles
At
the end
of
the fourth
The
anti
-
pump
relay is
located
on
the
left
side
of
the
front
channel
above the
control
relay
.
The connections
to
this
relay
are
soldered
.
Re
-
moval
of
the
relay
is
straight
forward
.
When
re
-
installing
use
extreme
care
to
avoid
shorting
contact
points
of
different
voltage
potential
with
solder
of
flux
.
This
procedure
may
be
halted
The
closing
control
relay
consists
of
a
strong
box
solenoid
with
sufficient
linkages
to
operate
the
remotely
located
D
switches
.
1
.
Install the
safety
pin
(
3
)
as
described
.
above
.
Stored
-
Energy
Manual Mechanism
(
Fig
.
15
)
2
.
AK
-
50
-
75
-
100
Separate
the
front
and
rear
frames
as
described under
REPARATION
OF
FRONT
AND
REAR
FRAMES
”
in
the
”
MAINTENANCE
”
section
of
these
instructions
.
This
breaker
is
equipped
with
a
spring
-
charged
stored
-
energy
mechanism
similar
to
the
mechanism
17
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