GE AK-50 Series - Open Fuse Lockout Device; Open Fuse Lockout Device Operation; Open Fuse Lockout Device Adjustments

Low
Voltage
Power
Circuit
Breakers
GEK
-
7303
•
2
1
.
Crossbar
Side
-
link Pin
2
.
Operating
Link
3
.
Lockout
Adjusting
Screw
4
.
Device
Latch
5
.
Lockout
Trip
Paddle
6
.
Trip
Shaft
7
.
Latch
Release
Strap
8
.
Shunt
Trip
Armature
Lever
9
.
Shunt
Trip
Armature
10
.
Shunt
Trip
Device
11
.
Bell
Alarm
Plunger
12
.
Device
Adjusting
Screw
13
.
Operating
Arm
14
.
Manual
Trip
Rod
15
.
Catch
16
.
Trip
Rod
Release
Collar
16
3
4
15
5
Z
14
6
8
9
10
!
3
Fig
.
46
(
845
C
278
)
Bell
alarm
and
lockout
device
AK
-
50
,
AK
-
75
and
AK
-
100
breaker
is
tripped
by
an
overcurrent
or
under
-
voltage
condition
,
and
by
the
drawout
trip
inter
-
lock
.
This
device
is
furnished
on
all
AKU
fuses
.
breakers
,
breaker
fuse
combinations
and
LB
-
1
protectors
furnished
after
August
,
1960
.
devices
are
mounted
on
the
left
hand
side
of
the
breaker
(
looking
from front
)
.
The
purpose
of
this
device
is
to
trip
the breaker
upon
the
blowing
of
any
one
of
the
breakers
fuses
.
OPERATION
When
any
one
of
the
breakers
fuses
blow the
coil
(
6
)
,
in
that
particular
phase
,
is
energized
and
tne armature
(
8
)
closes
.
The
armature
(
8
)
moving
to
the
closed
air
gap
position
engages
the
trip
paddle
(
1
)
and
trips
the
breaker
,
the
armature
closed
,
spring
(
13
)
discharges
,
pivot
-
ing
the
arm
(
9
)
in
a
clockwise
direction
and
latches
the
armature
(
9
)
in
the
closed
position
.
This
motion
also
moves
the
reset
button
(
10
)
forward
in
the extended
position
indicating
which
fuse
has blown
.
The
latch
closed
armature
holds
the
breaker
in
the
trip
free
position
until
it
is
released
by
operation
of
the manual
reset
button
(
lO
)
.
The
coil
(
6
)
is
de
-
energized
as
soon
as
the
breaker
is
tripped
open
.
The
3
.
The
lockout
adjusting
screw
(
3
)
should
be
adjusted
so
that
it
engages
the lockout
trip
paddle
(
5
)
and
displaces
the
trip
shaft
(
6
)
when the breaker
is
opened
.
This
assures
that
the
breaker
is
locked
open
until
the
device
is
reset
as
described above
.
The
lockout
adjusting
screw
is
furnished
only
with the lockout
feature
.
4
.
With
the
manual
trip
button
fully
depressed
,
position
the
trip
-
rod release
collar
(
16
)
on
the
trip
rod
(
14
)
so
that
the
latch
(
4
)
and catch
(
15
)
are
disengaged
before the
breaker
opens
.
5
.
This
device
is
equipped
with latch
release
strap
(
7
)
which is
engaged
by
the
shunt
trip
armature
lever
(
8
)
when
the
shunt
trip
device
is
operated
.
This defeats the
device
when the
shunt
trip
device
operates
.
The
latch release
strap
(
7
)
,
which
is
a
part
of
the
device
latch
(
4
)
,
must
be
formed
to
hook
around
the shunt
trip
armature
lever
(
8
)
in
a
manner
that
will
assure
the
device latch
and
catch
are
disengaged
before
the
breaker
opens
.
With
ADJUSTMENTS
From
1
/
32
inch
to
1
/
16
inch
overtravel
of
the
armature
is
required
when
the breaker
is
tripped
.
If
adjustment
is
necessary
,
loosen
lock
-
nut
(
4
)
and
turn
rod
(
3
)
in
or
out
to
obtain
the
proper
overtravel
.
Retighten
lock
nut
(
4
)
.
A
1
/
8
"
Min
.
dimension
should be
maintained
OPEN
FUSE
LOCKOUT
DEVICE
(
Fig
.
47
)
The
open
fuse
lockout
device
consists
of
2
or
3
separately
operated
devices
(
one
per
phase
)
each
wired
in
parallel
to
corresponding
breaker
45
Courtesy of NationalSwitchgear.com