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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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