GEI-86134,
Power
Circuit Breokers
la
Speciol 250OA
Fuse
for
AKRU-SO
This
fuse
provides
a meltingtime-current
char-
acteristic that coordinates
with 16004. trip devices.
Compared
physically
with a
25004 NEMA Class L
fuse, the
special
fuse
is
more
compact
(shorter)
;
its tangs
are specially
configured
and offset
to
achieve
the
required
pole-to-pole
fuse
spacing; a
special
primary
di
sc
onnect assembly m
ounts
direcUy
on
the
outboard tang
of the fuse.
Considering their
unique
mounting
provisions,
when
replacing
these
fuses
the following
procedure
should
be
adhered
to
(Refer
to Fig.
12):
1.
Remove
the
primary
disconnect
assembly
from
the fuse
taag,
accomplishedby
first loosening
the two keys
(2)
via
their holding screw and
pulling
them upward
and
out.
After
the keys
are
removed,
pull
the disconnect assembly
off
the
end of
the fuse
tang.
NOTE: This remoual
does
not disturb
the
disconnectts
clamping
force
adjustment,
2.
Remove
the upper
barrier
(4)
.
3 . Detach the inboard end
of
the
fuse
by remov-
ing
the
turo
1/2 inch
-
13 bolts. A
ratchet
and
socket with
a short extension
will
be required.
t2
Fi.g. 12.
AKRU-|0
breaker with
special
25004
fuse
1.
Special
25004
Fuse
2.
Disconnect
Key
3.
Heat Sink
4.
Upper Barrier
5.
Primary
Disconnect
4.
Remove the heat
sink
(3).
5.
Remove the fuse.
6.
[rstall the
new fuse
by reversing the dis-
assembly
procedure.
Ensure that the mating
faces
of
the
fuse
and heat sirk are clean.
CAUTION:
WHEN REPIACING THE
FUSE
IN
THE LET-T POLE
(FRONT
VIEW) OF THE BREAKER, NOTE PAR-
TICUIARLY THAT THIS
FUSE
15
MOUNTED DIFFERENTLY THAN THE
OTHER TWO FUS,DS. AS SHOWN
IN
FIG. 14,
FOR
THIS
PHASE THE FUSE
IS ROTATED 180 DEGREES ABOT]T
I7:S
AXIS
SO
THAT ITS INBOARD
TANG
IS
POSITIONED BENEATH THE BREAKER
STUD. fUtS
rAtr,C tS OFFSET
WITH
RESPECT
TO THE
OPPOSITE
END
(SEE
FIG. 13,
SO THAT
ROTATING
THE FUSE
DOES
NOT ALTER
THE
POSITION
OF
THE
PRIMARY
DISCONNECT.
Open
Fuse Lockout Device
Refer to
GEK-7310,
page
31.
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