GE AK-50 Series - Quick Close Breaker Adjustments

GEK
-
7303
Low
Voltage
Power
Circuit
Breakers
reduction
unit
and
through
a
worm
gear
and
a
planetary
gear
train
drives
the
crank
(
10
,
Fig
.
10
)
with
a
reduction
1000
:
1
.
To
remove
the
motor
and
gear
-
reduction
unit
,
proceed
as
follows
:
1
.
Remove
the
front
frame
(
see
SEPARATION
OF
FRONT
AND
REAR
FRAME
.
)
2
.
Remove
closing
springs
and
crank
-
shaft
as
illustrated
in
Fig
.
12
and
13
.
3
.
Disconnect
the
leads
from
motor
and
remove
the
wires
attached
to
gear
unit
housing
.
4
.
Remove
four
bolts
at
the
bottom
of
the
front
frame
and
one
bolt
at
top
of
gear
reduction
unit
.
The
motor
and
gear
unit
may
now
be
removed
.
NOTE
:
If
it
is
desired
to
replace
only
the
motor
unit
,
disconnect
the
motor
leads
and
remove
only
the
hardware
fastening
it
to
the
gear
-
reduction
unit
.
When
removing
the
motor
only
,
the
front
frame
should
be
placed
front
side
down
to
prevent
the
oil
escaping
from
the
gear
unit
.
"
B
'
A
"
O
LATCH
ROLLER
Fig
.
14
A
The
gear
reduction
unit
contains
4
ounces
of
oil
similar
to
Atlantic
Refining
Company
’
s
Grade
HFS
No
.
3
.
'
It
should
not
be
necessary
to
add
or
change
oil
except
when
the
gear
-
reduction
unit
and
motor
are
disassembled
.
Quick
-
Closing
Release
Latch
-
Fig
.
14
A
Adjust
the
engagement
of
the
roller
on
the
latch
to
l
/
8
”
±
l
/
64
”
by
turning
the
screw
"
A
”
.
After
adjustment
is
set
,
lock
the
bolt
with
the
hex
nut
TfBTT
.
Adjust
the
clearance
between
the
latch
and
the
roller
to
1
/
32
+
0
-
1
/
64
by
turning
the
screw
TTCTT
.
QUICK
CLOSE
BREAKER
ADJUSTMENTS
The
quick
close
breaker
basically
differs
from
the
standard
breaker
in
that
the
precharging
operation
is
extended
to
and
slightly
past
the
top
dead
center
position
of
the
closing
spring
assembly
.
As
the
springs
start
to
discharge
to
close
the
breaker
,
the
discharge
operation
is
arrested
by
a
prop
and
latch
arrangement
.
The
subsequent
closing
operation
is
accomplished
by
tripping
the
latch
to
release
the
prop
which
in
turn
allows
the
springs
to
continue
the
interrupted
discharging
operation
and
close
the
breaker
.
The
gear
reduction
unit
for
the
standard
breaker
is
not
interchangeable
with
the
gear
reduction
unit
-
on
the
quick
close
unit
because
the
quick
close
gear
reduction
unit
employs
a
slip
clutch
to
relieve
the
pressure
that
would
otherwise
be
exerted
between
the
output
crank
plate
and
the
prop
.
After
the
closing
springs
have
been
completely
charged
and
the
prop
and
latch
system
are
pre
-
venting
closure
of
the
breaker
,
the
closing
opera
-
tion
may
be
accomplished
by
energizing
the
closing
relay
thru
the
control
relay
contacts
,
or
man
-
ually
by
depressing
the
push
to
close
lever
which
mechanically
displaces
the
latch
to
allow
the
breaker
to
close
.
MAGNET
SPACER
jm
A
ROLLER
RELEASE
ARM
O
ARMATURE
32
^
0
;
GO
[
*
“
I
Fig
.
14
B
Release
Arm
Adjusting
-
Fig
.
14
B
Adjust
release
arm
screw
”
D
”
so
that
the
stroke
of
the
armature
of
the
closing
solenoid
releases
the
roller
from
the
latch
with
a
minimum
of
1
/
32
”
over
-
travel
.
Check
by
using
1
/
32
”
GO
and
3
/
32
”
NO
GO
gauge
between
armature
and
magnet
.
On
drawout
breakers
an
interlock
between
the
breaker
and
enclosure
requires
the
springs
to
be
discharged
before
the
breaker
can
be
removed
from
the
enclosure
.
16
Courtesy of NationalSwitchgear.com