GE AK-50 - Drawout Mechanism and Shunt-Tripping Device; Secondary Disconnects Replacement; Drawout Mechanism Function and Adjustment; Shunt-Tripping Device Description and Replacement

Low
-
voltage
Power
Circuit
Breakers
GBI
-
74600
r
edge
of
the
trip
interlock
pin
(
3
)
and
the
adjusting
screw
on
the
interlock
trip
paddle
.
SHUNT
-
TRIPPING
DEVICE
(
Fig
.
31
)
The
shunt
tripping
device
is
mounted
on
a
bracket
attached
to
the
left
side
of
the
operating
mechanism
(
looking
from
the
front
)
.
A
remote
switch
or
relay
contacts
are
used
to
close
the
circuit
of
the
de
-
vice
causing
the
armature
(
9
)
to
engage
the
trip
paddle
(
11
)
,
thereby
tripping
the
breaker
.
The
spring
(
2
)
is
used
to
return
the
armature
to
the
neutral
position
after
the
breaker
trips
.
To
prevent
overheating
,
the
coil
(
7
)
is
cut
off
by
contacts
of
the
auxiliary
switch
which
are
open
when
the
breaker
is
open
.
stationary
and
movable
halves
of
the
disconnects
engage
and
disengage
.
For
complete
details
of
inserting
and
with
-
drawing
the
breaker
,
such
as
the
num
-
ber
of
racking
handle
strokes
required
to
install
or
withdraw
the
breaker
,
re
-
fer
to
instruction
GEH
-
2021
furnished
with
the
breaker
.
3
.
Pull
contact
tip
loose
from
hol
-
low
tube
.
4
.
Remove
contact
tip
by
cutting
wire
at
its
base
.
5
.
Push
wire
through
hollow
tube
of
new
disconnect
assembly
.
6
.
Strip
insulation
offend
of
wire
to
about
1
/
4
in
.
from
the
end
.
The
drawout
mechanism
is
equipped
with
a
drawout
trip
interlock
which
prevents
a
racking
operation
from
be
-
ing
performed
when
the
breaker
is
closed
.
Inserting
the
breaker
into
the
housing
causes
the
racking
pins
on
the
housing
to
engage
the
semi
-
circular
slot
.
in
the
racking
cam
(
4
)
.
In
this
position
the
breaker
is
ready
to
be
fully
racked
-
in
by
operating
the
racking
handle
(
1
)
.
The
first
upward
stroke
of
the
racking
handle
causes
the
racking
pin
on
the
housing
to
engage
the
trip
interlock
link
and
pin
assembly
(
2
,
3
)
,
rotating
the
link
(
2
)
and
causing
the
pin
(
3
)
to
move
upward
against
the
ad
-
justing
screw
on
the
interlock
trip
pad
-
dle
.
This
trips
the
breaker
and
holds
it
trip
-
free
during
the
entire
racking
operation
.
The
fifth
and
final
stroke
of
the
racking
handle
releases
the
trip
interlock
and
allows
the
breaker
to
be
closed
,
since
the
breaker
is
now
fully
racked
-
in
.
7
.
Place
new
contact
tip
on
end
of
wire
and
crimp
.
r
8
.
Pull
wire
through
hollow
tube
un
-
til
contact
tip
fits
snugly
against
end
of
hollow
tube
.
9
.
Crimp
tab
on
other
side
of
as
-
sembly
to
hold
wire
in
place
.
10
.
Any
hollow
tubes
which
are
not
used
should
be
pushed
into
the
discon
-
nect
body
and
held
in
that
position
by
placing
fiber
spacers
over
inner
ends
of
tubes
and
spreading
tabs
.
ADJUSTMENTS
From
1
/
32
-
in
.
to
1
/
16
-
in
.
over
-
travel
of
the
armature
is
required
when
the
breaker
is
tripped
.
If
any
adjust
-
ment
is
necessary
to
provide
this
amount
of
overtravel
,
the
trip
lever
is
bent
in
or
out
accordingly
.
11
.
When
all
wires
have
been
con
-
nected
,
refasten
the
body
of
the
mov
-
able
disconnect
assembly
to
the
break
-
er
cross
-
channel
.
DRAWOUT
MECHANISM
(
Fig
.
30
)
Drawout
breakers
are
furnished
with
a
drawout
mechanism
which
facil
-
itates
the
inserting
and
withdrawing
of
the
breaker
from
its
enclosure
.
It
pro
-
vides
a
suitable
means
of
forcing
the
breaker
through
the
part
of
the
insert
-
ing
and
withdrawal
operations
when
the
REPLACEMENT
OF
COIL
(
Fig
.
31
)
1
.
Disconnect
leads
to
coil
(
7
)
.
2
.
Remove
magnet
(
6
)
and
coil
from
frame
(
3
)
.
3
.
Bend
lower
end
of
clamp
(
8
)
straight
and
remove
.
4
.
Remove
coil
and
install
new
coil
in
reverse
order
.
ADJUSTMENTS
(
Fig
.
30
)
One
adjustment
on
the
trip
interlock
is
required
.
With
the
breaker
mecha
-
nism
in
the
reset
position
and
the
rack
-
ing
cam
(
4
)
not
engaging
the
racking
pins
on
the
housing
,
there
should
be
at
least
1
/
8
-
in
.
clearance
between
the
top
O
o
12
a
—
s
-
ii
2
A
r
"
EEJ
B
2
-
o
|
o
o
2
o
c
3
^
o
4
?
3
r
?
Ml
—
i
10
>
4
S
r
9
IS
L
°
r
^
8
TRIP
(
AUX
.
SW
)
c
1
o
Ll
~
0
2.0
ir
*
7
.
;
o
3
c
4
o
I
:
/
0
5
M
2
m
s
o
THT
-
7
05
?
c
l
—
/
•
*
>
6
M
rc
B
1
.
Screws
2
.
Spring
3
.
Frame
4
.
Pin
5
.
Screws
6
.
Magnet
7
.
Coil
8
.
Clamp
9
.
Armature
10
.
Armature
Arm
11
.
Trip
Paddle
12
.
Clamp
1
.
Racking
Handle
2
.
Link
3
.
Pin
4
.
Racking
Cam
Fig
.
37
.
Shunt
tripping
device
Fio
.
30
.
Typico
/
drowout
mechanism
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