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Low
Vohage Switchgeo
r,
GEK-72101
-1#
q.)'
L
&*-
FlG.
20
(75E180001) Rockout
mechonism
for
AKR
breqkers
I
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The
DISCONNECTED
and CONNECTED positions
are
indicated by
the sight
indicator
and
by
the jackscrew
reach-
ing
the end
of
its
travel. The adjusting
nuts (78)
are set
so
that
when
the CONNECTED position
is
reached,
the
pin
and the interlock tube
slot
will
be
aligned and the
breaker
can
be closed
upon removal
of
the rackout handle.
In
the
DISCONNECTED
position,
it
may
be
necessary
to
rotate
the jackscrew
pin
to
match
the slot
in
the interlock
tube.
The motion
of
the rackout
mechanism
can
be
reversed
at any point in
the cycle
by
reversing
the direction
of ro-
tation
of
the
handle.
EMERGENCY OPERATION
If
necessary,
it
is
possible
to
remove
the
breaker from
the
house
without using the
rackout mechanism.
This
is
done
by rotating
the track lock
links after
the
breaker
has
been
tripped and
pulling the
breaker
manually off
of
the
primary
disconnects.
Ffowever,
the
breaker cannot
be
reinserted
into
the
house
far
enough
to
engage
the primary
disconnects
unless
the
stop
links
(49, 50)
are
retracted.
The stop
links
retract
automatically
when
normal racking
procedures
are
used.
If it
is
necessary
to
insert
the
breaker
into the
house
when the
rackout
mechanism is
in
the
CONNECTED
posi-
tion, the stop links must be
retracted
and held
until
the
interference
pin
or
the breaker
mounting pin
has
passed
the
stop
link.
It
is
recommended
that
the stop
link
be
held up
with
masking tape when
attempting
to
insert the
breaker
in
this
manner. The
inertia
of
the breaker can then be used
to
aid in
pushing
it
onto the
primary
disconnects.
RACKOUT MECHANISM OPERATION
AKR
BREAKERS
Part
numbers
in Figure
20
refer
to
sheet
and
part
num-
bers
in
the
0673D0500 series
of
drawings.
The
rackout
mechanism
for AKR
breakers
is
mounted
on the breaker
itself
and
a
description and details
of
this
mechanism
are given
in
Maintenance
Manual
GEK-7310.
The rackout
mechanism
is
operated
by
pushing
the
handle
onto
the
end
of
the
jackscrew
shaft and
rotating
the handle.
Clockwise
rotation
moves
the breaker
into
the
house
and
counter-clockwise
rotation
moves
the
breaker
out. Approximately
18
turns
of
the
handle
will
move
the
breaker
from
the
DISCONNECTED to
the CONNECTED
position.
The
rackout
mechanism
is interlocked
so
that
the
circuit
breaker
must
be
open before
the
operating handle
can
be
inserted. When
the
breaker
is
closed,
an
interlock link
operated
by
the
breaker mechanism
locks the sliding
cover
over
the
racking
screw
in
the
breaker
escutcheon.
To
insert
the
racking
handle
the
trip
button must
be
depressed, and
the
sliding
cover pushed
to
the right.
When
the
handle
is
insert-:d
the cover
is
held
open
and
the
breaker
is
in
a
trip
free
condition. As
long as the handle
is
engaged, the
breaker remains
trip
free.
There is also
a
stationary
cam
in
the house
which holds
the
breaker
trip
free
as
it
is
moved
between
the CONNECTED
and
TEST
positions
by
keeping
a lever which
is
connected
to
the
breaker
trip
shaft
in the
raised
position.
See
Figure
20,
part
841-01.
This stationary
cam
comes
into
oper..tion
before the
primary
disconnects have
parted
and
is
operable
whether
or
not
the rackout handle is
engaged.
The
breaker
25
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