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Low
Voltoge Swifchgeor,
GEK-72101
{INNER
HoUsE
S|DE SHEET
P',,
KEY
LOCK
LOCK
FlG.
22
(75C150021) Key
Interlock for
AKR breokers
KEY INTERLOCKS FOR AKR
BREAKERS
(OPTIONAL)
The
key interlock
is
mounted
with two
one-way
screws
and
lock
washers
to
the
left. side
of the inner
house.
The interlock
system
is
designed so
that
the key may
be
removed
from the lock
only
if
the
breaker
is tripped
and
the lock
bolt is
extended.
When
the
bolt is
extended, the
breaker
is
rendered
trip
free
only
in
the
CONNECTED
po-
sition
in
the
house.
The breaker
may
be
operated (closed and
tripped) in
the
TEST or DISCONNECTED
positions
even
when
the lock
bolt is
extended
and the
key
removed.
The
operation
of
the key interlock should be
checked
as follows:
1.
With
the
breaker
in
the
CONNECTED
position,
man-
ually
trip
the
breaker.
This
then allows
the interlock
trip
slide
(837-06)
to
be pushed
in.
When the
trip
slide
is
in,
the
lock bolt may be
extended
and
the
key
removed.
The
breaker
will
remain
trip
free
in
the
CONNECTED
position
until
the key is returned and the lock
bolt is
retracted.
2.
If
desired,
the
breaker
may be
moved
to
either
the
TEST
or
the DISCONNECTED position while
the
key
is
removed
from the lock.
In
these
positions
the
breaker
can be
operated
for
checking
or
maintenance.
KEY INTERTOCKS FOR FUSE ROLTOUTS (INCLUDED)
AK
breakers
that
are used
in AKD-6
switchgear cannot
be
equipped
with
fuses
as an
integral
part
of
the
breaker
assembly.
When
fuses
are required
with
these
breakers,
they
are mounted inside
a
drawout
frame
similar
to
that
used
for the
breaker.
This
assembly
is
known as
a
fuse
rollout
element, and a
typical
model
is
shown
in
Figure
23.
A
hinged panel made
of
perforated steel
is
positioned
in
front of the
fuses
so
that
they
cannot
be
reached
if
the
compartment door
is
opened.
An
interference
angle
is
at-
tached
to
the
left
side
of this
panel
to
prevent
it
from
being swung
open unless
the fuse
rollout
is
fully
withdrawn.
The
fuse
rollout
is usually
located
in a
modified
breaker
compartment
directly below
the
compartnient
for
tlic
breaker
with which the
fuses
will
be
used.
It
is put
into
this
compartment the
same
way
an
AK
breaker
is
inserted
into a
compartment.
See
Page
16.
NOTE: THE
KEY LOCK BOLT
IN THE
FUSE
ROLLOUT COMPARTMENT MUST
BE
RE-
TRACTED
BEFORE
THE ROLLOUT CAN
BE
RACKED
INTO THE CONNECTED
POSITION.
HOUSE
CAM,mRT
0F
84t-01
FlG.
23
(8040045)
Fuse
Rollour used
wirh AK
breokers
27
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