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C
&
H
-
2021
Installation
and Operation
of Typo AK Power Circuit Breakers
cause
the
breaker
to
bo
trip
free .
Tighten
the 3
/
8
inch hex head
screws
inserted
In
'
the
front holes of the dr
aw out
tray
during
step
5 of
this
operation
.
The breaker is
new
in
the
operating
position
.
Withdrawing
Breaker A
-
K
-
50
,
76
and
100
Use D 5 GH
47
lubricant
on
the disconnect
secondary
contacts
are
disengaged
.
Again
terminals to reduce
the
force
required
to
lift the
position
stop
handle
.
Slide the
insert
the breaker
.
breaker
slightly
forward
to remove
it from
the enclosure
.
The
procedure
for
inserting
and with
-
drawing
a
drawout breaker
from its en
-
closure is
as
follows
;
Inserting
Breaker AK
-
50
,
75 and 100
1
.
Lift
the breaker
to a
position
ap
-
proximately
—
s
4
x
-
4 nohes
-
above
-
iheJieight
_
_
Ql
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
drawout AK
-
5
G
or
75
,
locate
a
bolt head
over
the
two
frontbottom
mounting
holes of the housing to
provide
a
limit
stop for
the
drawout
tray
.
3
.
Lower the
breaker about
1
/
2
"
above
the
dowel
pina
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
fit
over
the
two
dowel
pine
on
the
tray
.
If
the breaker is correctly positioned
on
the
dowels
,
its
rear
and aide bottom frame
angles
will all sit
firmly
on
the tray
.
5
^
Insert
two
3
/
8 Inch heJt
.
head
screws
through the holes in the front of the
side
angles
on
the
breaker and
thread them
part
way into the tapped holes in the tray
.
Dp not
tighten
screws
firmly
.
This
provides
better alignment of
the
primary stationary
studs and the
primary
disconnects for
the
subsequent
racking
operation
.
6
.
Push the breaker into the
compart
-
ment
until the
"
teat
"
position
stop engages
to prevent
further travel
.
(
Note
-
Refer to
section
describing
" Test
Position
"
in
these
instructions
.
)
7
.
Release the
test
position
atop by
depressing
Us lever and
push the
breaker
back into the
compartment until the racking
pins
on
the
housing
butt
against
the
outer
surface of
the
.
racking
cam
.
In
this posi
-
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
.
1
.
Trip the breaker to
release
the
positive
racking
interlock
.
Inserting
Breaker
AK
-
15
and
25
1
, Trip the breaker
.
2
.
Raise the breaker
until the
guides
on
the sides
of
the breaker
are
level with
their
mating supporting
channels
in
tee
enclosure
,
and slide 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
,
located
at
the
bottom
right
of the enclosure
,
which
will
release
the position
stop and
allow the
breaker
to
travel further Into the
cubicle )
.
2
.
Lift the
racking
handle
as
far
as
U
will go
.
This
operation
will
re
-
engage
UK
*
trip
interlock
in
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 racking
the
breaker
in
,
the
operation is performer
as a
H
of
pushing the
handle
down
.
3
.
Reset the
handle
to its
lowered
position and
lift it again
.
This
operation
must be performed 5 times to
completely
disengage the cams from their
racking
pins
.
After the fifth lifting stroke let
.
the
handle drop
to Its normal
position
.
Lift the
position
stop handle
,
4
.
Pull the breaker out oi
lbs
com
-
partment until
the
test
position
stop
engages
to
hold the breaker in the
"
test
"
position
.
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
.
5
.
Depress
the
teat
position stop han
-
dle
and
pull the breaker
out
of its
com
-
partment as far
as
the drawout
tray
Will
travel
.
4
, Pugh
downward
on
the rackout han
-
dle forcing the
pins
on
the handle
up into
the slot
In
the stationary
cam
plate
.
This
action
forces
the breaker through
a .
final
short
portion
of
its
movement
into the
en
-
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
ie
rotated down
-
wards
as
far
as
its free travel will
permit
iind then
pull
the racking handle down
to
be
sure tee
trip interlock
is
released
.
(
Note
-
When tbe
racking
handle Is In any
position
other than completely
down
,
the
breaker
cannot
be operated and is held
trip
-
free by the
trip
interlock
.
This
ap
-
plies
to
the
"
fully
in
"
and
"
test "
positions
,
)
6
.
Remove the
two
3
/
8 hex
.
head
screws
which
hold the breaker
on
the
tray
.
7
.
Attach
a
lifting
device
to tee
top
frame of the
breaker
.
8
.
LUt
the breaker approximately
i
/
2
inch off
the dowel pins on
the
tray
and
then
pull
the breaker forward
until ite
primary
contacts
clear tee
compartment
.
9
.
Push the tray all
the way
back
into
its compartment
.
The breaker is
now
free from
Its compartment
.
TEST
POSITION
8
. When
the
pawl
engages the first
The
" Test Position "
,
as referred to
in
notch
on tee cam
,
push
the handle down
the previous Inductions
,
Is that breaker
again to its normal
position
.
This
causes
position
where
tee
primary
power
disc
on
-
the
cam to rotate
about the
racking pin
,
neet
contacts are
safely disengaged
but
trie
Repeat this operation five times
to
rack the
secondary
control
disconnects are
engaged
breaker into Its fteal operating position
.
.
In
this position
,
the
breaker may
bo tested
Interlocksi
hold the breaker
trip free
until
or
operated
,
manually
or
electrically with
-
it is racked
Into
the fully contacted position
.
out energising the primary power circuit
.
The fifth
i
stroke
of the handle Is only
a
provided the
racking
handle has been moved
partial
stroke
and does
not result tn
any
to tee
completely down position
,
thus
re
-
further
movement
of the breaker
.
It
does
leasing the trip
interlock
,
serve
three useful
purposes
: it positions the
cam
so
that it
cannot
rotate
and allow the
breaker
to
back
out
under short
circuit
stresses
; the
partial stroke signals
that
the
racking
operation is complete
,
and
it
re
-
leases
the trip interlock
which
was
engaged
by
tlve
racking pin
during the previous four
pumps of
the racking
arm
.
NOTE : Once a
racking operation has been
started
,
It
must
be completed
,
as
tee breaker
cannot
be
reversed
until the racking
operation Is
completed
.
Withdrawing
Breaker
AK
-
15
and
25
1
.
Trip
the breaker
open
.
If the
breaker 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
ft will travel
,
disengaging
the primary
disconnects
.
3
.
Slide
the breaker
out
until the
position
stop engages
in the
front
slot
In
the
bottom of the
breaker
carriage
.
The
breaker is
now
in the
" test
"
position
,
where
its
primary disconnects
are
safely
disconnected from the line
and load
ter
-
minals 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 thq
breaker
forward until the
position
stop engages
the
rear
slot
In
the bottom of
the breaker
carriage
.
This is the
safety
position
stop where both
the
primary
and
"
TSS
:
- -
For a more
complete
description
ai
drawout
mechanisms and enclosures
see
AKD
DRAWOUT
EQUIPMENT
INSTRUC
-
TIONS
,
GEH
-
1830 andAKD 5
DrawoutEquip
-
ment
Instructions GEH
-
83902
,
•
DRAWOUT BREAKERS
AKD 5 EQUIPMENT
NOTE :
AKD 5 breakers are identified
by
letter
"
A
" appearing
after
breaker
number
-
-
A
A
**
%
4.4
4
.
v
*
.
example
,
t
,
AK
-
2 A
-
15
"
.
9
.
After
completing
the fifth racking
stroke
,
ltft the handle as
high
as
it
will go
-
A
~
.. .
and
allow
it
to
drop
to
its normal position
.
•
Draw ou t
M
eg
hanismOpe
r a turn
-
There
&
®
NOTE : Any
strokes beyond this
point
will
'
four
positions
of the
drawout
mechanism
.
4
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