GEK
..
7302
Installation and Operation
of
Type
AK
Power
Circuit
Breakers
Large
drawout
breakers
are
fastened to a
telescoping
tray
which extends out
from
the
enclosure to
receive
the
breaker.
Small
breakers
have guides on
their
side
plates
which
slide
in channels in the
enclosures.
Both
large
and
small
breal.ters have a
test
position in which the
secondary
disconnects
are
engaged, but the prime.ry
d~sconnects
are
not. In
this
position, the
breaker
may
be operated
electrically
without energizing
the load cable
or
bus.
Use
D50H47
lubricant
on
the disconnE!ct
terminals
to reduce the force
required
to
insert
the
breaker.
!~g
Breaker
AK-15 and 25
1.
Trip
the
breaker.
2.
Raise
the break:er unttl the guides
on
the
sides
of
the
breaker
al'e level with
their
mattng supporting channels in the
enclosure, and sllde the
breaker
part
way
into
its
enclosure. (Note - The
breaker
will be obstructed
by
a position stop at the
bottom of the
enclosure
after
the
breaker
has
traveled
only a
short
distance into the
cubicle, Lift the position stop handle,
located
at
the bottom
right
of
the
1
enclosure,
which will
release
the
pos~tion
stop and
allow the
breaker
to
travel
further tnto the
cubicle).
3,
Raise
the rackout handle forward
and
up
as
far
as
its
travel
will
permit
and
push the
breaker
into the enclosure until
the rackout pins . on the handle
assembly
bear
against
the housing rackout cams
on
the
side
of the enclosing
case.
4.
Push
downward on the rackout
hanM
dle forcing the pins on the handle
up
into
the
slot
in the stationary
cam
plate., "!'his
action
forces
the
breaker
through a final
short
portion
of
its
movement into the
enM
closure
and allows the
operator
to provide
the force
necessary
to make the
primary
disconnects engage the stationary studs in
the
enclosure,
In
performing
this
operation,
make
sure
that the handle
is
rotated
down~·
wards
as
far
as
its
free
travel
wUl
permit
and then pull the racking handle
down
to
be
sure
the
trip
interlock
is
released.
(Note
~
When the racking handle
ts
in
any
position other than completely down, the
breakel' cannot be operated and
ls
held
trip-free
by the
trip
interlock. This
ap-
plies
to the
11
fully ln" and
"test"
positions,)
Withdra;_~ing
Breaker
Al_{-15
~..!~.
1.
Trip
the
breaker
open,
If
the
b1•eaker
is
not open, the interlock
lever
of
the drawout mechanism will not
permit
operation
of
the rackout handle.
2.
Pull
the racking handle
up
and
for-
ward
as
far
as
it will
travel,
disengaging
the
primary
disconnects.
3. Slide the l;lreaker out until the
position stop
~ngages
in the front
slot
in
the bottom
of
the
breaker
carriage,
'rhe
breaker
is
now
in the
"test"
position,
where
its
primary
disconnects
are
Bafely
disconnected fl'o1n the line and load
ter-
1ninals
of
the enclosure. (Note - Refer to
section
describing
"Test
Position" in these
instructions,)
4. To remove the -
breaker
from
its
enclosure,
lift the position stop handle and
slide the
breaker
forwa1·d until the position
stop engages the
rear
slot
tn the bottom
of
4
the
breaker
carriage,
This
is
the safety
position stop where both the
primary
and
secondary
conticts
are
disengaged. Again
Uft
the position stop handle, Slide the
brealter
slightly forward to remove it fro1n
the
enclosure,
~ting
Breaker
Al<:-50,
75
and 100
1.
Lift the
breaker
to a position
apM
proximately
six
inches above the height
of
the compartment
tray.
2. Pull the drawout
tray
out under the
breaker
as
far
as
the
tray
will
travel.
NOTE - When installing an individual
skeleton housing for
a
drawoutAK-50or75,
locate a bolt head over the two front bottom
mounting holes.
of
the housing to provide a
Hmtt stop for the drawout
tray.
3. Lower the
breaker
about
1/2"
above
the dowel pins
on
the
tray
and push the
breaker
back into
its
compartment
so
that
the
rear
bottom angle
of
the
breaker
is
against the guides on the
tray
directly back
of
the dowel pins.
4, Slowly lower the
breaker
onto the
tray
and
at
the
same
time guide
it
so
that
the holes in the
rear
angle of the
breaker
flt over the
two
dowel pins
on
the
tray.
If
the b1•eaker
is
correctly
positioned
on
the
dowels,
its
rear
and side bottom
frame
angles will
all
sit
firmly
on
the tl'ay.
5,
Insert
two
3/8
inch hex, head
screws
through the holes in the front
of
the side
angles
on
the
breaker
and
thread
them
part
way into the tapped
holesinthetray.
l!Q..nQt
tighten
screws
.l!r.m.!YL
This provides
better
alignment
of
the
primary
stattonal'y
studs· and the p1•tmary disconnects for the
subsequent
racking
operation,
6.
Push
the
breaker
into the co1npart-
ment until the
"test"
position stop engages
to
prevent
further
travel.
(Note -
Refer
to
section
describing
"Test
Position" in
-U1ese
instructions,)
7. Release the
test
position stop
by
depressing
its
lever
and push the
breaker
back into the compartment until the racking
pins
on
the housing butt
against
-U1e
outer
surface
of
the racking cam. In
this
posi
M
tion, the
racking
pin has lifted the locking
arm
on
the cam which allows the racking
handle to be lifted enough
to
allow the pawl
to engage the
first
notch
on
the cam.
8.
When
the pawl engages the
first
notch on the
cam,
push the handle
down
again to
its
normal
position, This
causes
the cam to
rotate
about the racking pin,
Repeat tbis operation five
tlmes
to
rack
the"
.bl,'eaker into
its
final operating position,
Interlocks hold the
breaker
trip
free
until
it
is
racked into the fully contacted position,
The fifth
stroke
of the handle
is
only a
partial
stroke and does
11ot
result
in any
further movement
of
the
breaker.
It
does
serve
three
useful
purposes:
it positions the
cam
so
that
it
cannot
rotate
and allow the
breaker
to back out under
short
ctrcuit
stresses;
the
partial
stroke
signals that the
racking operation
ts
complete, and
it
reM
leases
the
trip
interlock which was engaged
by the l'acking pin during the previous four
pumps
of
the racking
arm.
NOTE: Once a
racking operation has been
started,
it
must
be completed
as
the
breaker
cannot
-be
reversed
unth
the
r~cking
operation
is
completed.
9,
After completing the fifth
racking
stroke
lift the handle
as
high
as
it
will go
and allow
it
to drop to
its
normal poslUon.
NOTE: Any
strokes
beyond
this
point
will
cause
the
breaker
to be
trip
free. Tighten
the
3/8
inch hex head
screws
inserted
in the
front
holes
of
the drawout
tray
during
step
5
of
this operation. The
breaker
ts now in
the operating position.
Withdrawing
Br~aker
AK"5°-1
75 and 100
1.
'frtp
the
breaker
to
release
the
positive racking interlock.
2, Lift the racking handle
as
far
as
it
will go.
This operation will
re-engage
the
trip
interlock to hold the
breaker
trip-free
for
the
remainder
of the
racking
operation.
Note that
here
the
cam
is
rotated by lifting
the handle, whereas in i·acking the
breaker
tn
1
the operation
is
performer
as
a
result
of pushing the handle down,
3. Reset the handle to
its
lowered
position and lift
it
again,
This
operation
must
be
performed
6
times
to completely
disengage the
cams
from
their
racking
pins.
After the flith lifting
stroke
let
the
handle drop to
its
normal
position.
4.
Pull
the
breaker
out of
its
com~
partment
until the
testposttton
stop engages
to hold the
breaker
in the
"test"
position.
5,
l)epress
the
test
position stop
hanm
dle and pull the
breaker
out of
its
com-
partment
as
far
as
the drawout
tray
will
travel,
6.
Remove the
two
3/8
hex, head
screws
which hold the
breaker
on the
tray,
7. Attach a lifting device to the top
frame
of
the brealter.
8, Lift the
breaker
approximately
1/2
inch
off
the dowel pins
cin
the
tray
and
then pull the
breaker
forward unttl
its
primary
contacts
clear
the compartment.
9,
Push
the
tray
all
the way back
into
its
compartment. The
breaker
is
now
free
from
its
compartment.
TEST POSl1'ION
The
"Test
Position",
as
referred
to in
the previous instructions,
is
that
breaker
position where the
primary
power
dtsconM
nect contacts
are
safely disengaged but the
secondary control disconnects
are
engagod,
In
this
position, the
breaker
may be
tested
or
operated, manually .or
electrically
with
...
out energizing the
primary
power
circuit,
provided the racking handle has been moved
to the co1npletely
down
position, thus
re-
leasing the
trtp
interlock.
For
a
more
complete
description
of
drawout mechanisms and
enclosures
see
AKD
DRAWOUT
EQUIPMENT INSTRUC-
TIONS,
GEH
..
1830 andAKD6DrawoutEquip
..
ment Instructions GE:I-90090.
. '
'
DRAWOUT BREAKERS AKD5 E:QUIPMENT
NOTE:
AKD5
breakers
are
Identified by
letter
11
A"
appearing
after
breakernumber-
example,
"AKM2A~l5
11
,
Courtesy of NationalSwitchgear.com
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