Open Fuse Lockout Device; Bell Alarm And Lockout Device Diagram - GE AK-2-50 Maintenance Manual

Low Voltage Power Circuit Br eakers GEK- 7303
.:
1. Crossbar Side-link Pin
2. Operating Link .
3. Lockout A~jusUng Screw
3--- ------
4- - - - - - -- -
, - - - - - - - 16
,---- - - 15
4. Device Latch
5. Lockout T r ip Paddle
5 - ---,--
6. Trip Shaft
7. Latch Rel ease Strap
. 6---t---\1~\
8. Shunt Trip Armature Lever
9.
Shunt Trip Ar mature
10. Shunt Trip Device
11. Bell Alarm Plunger
12. Device Adjusting Screw
13. Operating Arm
7- - -----~~ ~ ~ T)
8 -- - - --H;.~--."I
9 - - --~~\::::~q_-1;1
14. Manual T rip Rod
15. Catch .
16. Trip Rod Release Collar
10--- - -
II . 1 2
Fig. 46 (845C278) Bell alarm and lockout device AK-50, AK-75" and AK- 100
breaker is t ripped- by
an
overcurrent or under-
voltage condition, and by the drawout trip inter-
Jock.
. '
3. The lockout adjusting screw
(3)
should be
adjusted so that it engages the lockout t!'iP paddle.
(5) and displaces the trip shaft (6) when the breaker
is opened. T his assures that the breaker is locked
open until the device is reset as described above.·
The lockout adjusting screw is furnished only
with the l9ckout feature. -
4. With the manual trip button fully depressed~
position the t rip-r od release collar (16) on ,the trip
rod (14) so that the latch (4) and catch (15) are
disengaged before the }>rieaker opens.
5. This device is t qui~ped with latch release
strap (7) which i s engaged
py
the shunt trip armature
lever (8) when the ·shunt trip device is operated.
This defeats the device when the shunt trip device
operates. The l atch rel_ e ase strap (7), which is
a part of the device latch (4), must be formed to
hook around the shunt trip armature lever
(8)
in a manner that will assure the device latch and
catch are disengaged before the breaker opens.
OPEN FUSE LOCKOUT DE.VICE
{Fig. 47)
The open fuse lockout device consists of 2 or
3 separat ely operated devices (one per phase)
each wired in par allel to cor responding b r eaker
fuses. This device is furnished on all AKU
bre~ers, breaker fuse combinations and LB-1
protectors furnished after August, . 1960. The
devices are mounted on the left hand side of the
breaker (looking from front). The purpose of this
device.· is to trip the. breaker upon the blowing
of
any
one of the breakers fuses .
OPERATION .
When any orie of the breakers fuses blow· the
coil (6), in that particular phase, is energized
and the ar mature (8) closes. The _ a rmature
(8)
moving to the closed air gap position engages the
trip paddle (1) and trips the breaker . With
the armatur e closed, spring(13)discharges, pivot-
ing the arm (9)
in
a clockwise direction and latches
the armature (9) in -the closed position. This
motion als o moves the reset .button (10) forwar d
in the extended position indicating which fuse
has blown. The l atch closed armature holds the
breaker in the t rip free position until it is released
by operation of the manual reset button(lO). The
coil (6) is de-energized ·as soon as the breaker
is tripped open. - ·
ADJUSTMENTS
From 1/32 inch to 1/16 inch over tr avel of
the armature is required when the br eaker is
tri1wed.. If adjustment
is,
1recessar y, loosen lock-
nut (4) and tt:1rn rod (3} in or out-to.obtain the
proper overtravel. Retigllten l ock nut (4).
.
.
A
1/8"
Min. dimension should be maintained