OPEN FUSE LOCKOUT DEVICE
(Figure 3 1 )
The Open Fuse Lockout Device consists of
two or three separately operated devices (one per
phase). Each wired in parallel to corresponding
breaker fuses.
This device is furnished on
all
AKU breakers.
The purpose
of
this device is
to trip the breaker upon the blowing of any one of
the breaker fuses and render the breaker trip
free until the blown fuse is replaced and the
associated coil assembly reset.
OPERATION, Figure 3 1 .
When any one of the breaker fuses blow, the
coil (6) in that phase is energized and the armature
(5) closes. With the armature closed, leaver (2)
slips under the armature and latches it in the
closed position.
The latched closed armature
holds the breaker in the trip free position until
it is released by pushing the associated reset
button (1).
The coil is deenergized as soon as
the breaker opens.
ADJUSTMENTS
1 .
Set top cylindrical collor (not shown) to engage
the trip shaft paddle in the tripped position.
)
:
Figure 3 1 . (804 1865) Open Fuse Lockout Device
1 . Mounting Holes
2 . Lever
3 . Reset Button
4. Collor
5 . Armature
6.
Coil
3 6
4
.,
2 . Check that each armature holds the breaker
trip free when the armature position is limited
in reset by the lower latch surface on the
indicator.
3. With the breaker in the closed position, the
top collor must clear the trip shaft paddle
by more than 1/32 inch.
REPLACE MENT
1.
Remove three mounting screws at top
of
device.
2 . Remove coil leads from fuses and work wire
harness back to the device. Remove device
from breaker .
3 . Replace new unit in reverse order and check
procedure under ADJUSTMENTS.
AKD- 5 INTERLOCK
(Figure 32)
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, the interlock link (1 ) operated
by the breaker cross bar blocks the interlock
linkage on the rackout mechanism
•
Figure 32. (8039852 ) AKD-5 Interlock
1 . Rackout Mechanism Interlock
2 . Trip Interlock
www
. ElectricalPartManuals
. com
