Shunt-Tripping Device; Bell Alarm And Lockout Device; Replacement Of Coil - GE AK-2-50 Maintenance Manual

GEK-7303 Low Voltage Power Circuit Breakers
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Fig. 45
SHUNT-TRIPPING DEVICE
(FIG. 45)
•
II
•,
II
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)
-$
a
(0133C90? 1)
The shunt tripping device is mounted on a
bracket attached to the left side of the operating
m.echanism
(looking
from the front). ·
A remote switch or relay contacts are used
to close the circuit of the device causing the
ar_ma_ture
(9)
to engage the trip paddle (11), thereby
tr1ppmg the breaker. The spring (2) is used to
return the armature to the neutral position after
the breaker trips.
To prevent overheating, the coil (7) is cut
off by contacts of the auxiliary switch which
are open when the breaker is open.
ADJUSTMENTS
From 1/32 in; to 1/16-in. over-travel of the
armature ~s required when the breaker is tripped.
If
any adJustment is necessary to provide this
amount of overtravel, the trip lever is bent in
or out accordingly.
REPLACEMENT OF COIL
(Fig. 45)
1. Di. s connect leads to coil (7).
2. Remove magnet (6) and coil from frame
(3).
10
9
I.
SPRING
8
2. PIN
3. FRAME
4. WEIGHT
5. SCREWS .
6. MAGNET
7. COIL
8. CLAMP
9. ARMATURE
10. ARMATURE ARM
1
. II. TRIP PADDLE
12 .. CLAMP
Shunt tripping device
3. Bend lower end of clamp (8) straight
and remove.
4. Remove coil anq install new coil in re-
verse order.
BELL ALARM AND
LOCKOUT DEVICE
(FIG.
46)
The device operating link (2) is· engaged with
the breaker crossbar side-link pin (1), thereby
operating the device whenever the breaker is
tripped by the overcurrent trip devices, the under-
voltage device or the drawout trip interlock.
The shunt trip device and the manual trip button
will defeat the device. The bell alarm and lockout
device can be reset only by the manual trip button
on the front escutcheon.
If
the lockout device
is omitted, the device can . be reset by manual
trip button or by· closing the breaker, provided
the fault has been eliminated.
Adjustments
1. Adjust the bell alarm-device latch (4) so
that a clearance of 1/16 in.
:t;
1/64 in. is main-
tained with the catch (15) when the breaker is
closed.
2. With the breaker fully open, adjust the
device adjusting screw (12), on the operating
arm (13), for
an
overtravel of 1/16 to 3/32 of
an in. after the device contacts are just touching
This will assure that the device is operated when the