Miscellaneous; Shunt Tripping Device; Bell Alarm And Lockout Devices - GE AK-1-15 Instructions Manual
Air circuit breakers
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- Instructions manual (31 pages) ,
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GEH-1807 Air Circuit Breakers Type AK-1-15 and AK-1-25
MISCELLAN:EOUS
SHUNT TRIPPING DEVICE
The shunt tripping device (refer
to
Fig.
21)
is
mounted on a bracket attached
to,
the right side of
the operating mechanism (looking from the front).
A remote switch or relay contacts are used
to
close the circuit of the device causing the armature
(9)
to
engage the trip paddle (11) thereby tripping
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 amdliary switch which are open
when the breaker is open.
ADJUSTMENTS
From 1/32"
to
1/16" overtravel
of
the arma-
ture is required when the breaker is tripped.
If
any adjustment is necessary
to
provide this amount
of
overtravel, the trip paddle is bent in or out
accordingly.
REPLACEMENT
Coil
As with the undervoltage device, the only part
that ever normally needs replacement is the coil of
the device.
The replacement procedure is as
follows:-
1. Disconnect leads of coil (7).
2. Remove screws (5) which fasten magnet and
coil to the frame of the device.
3. Remove magnet (6) and coil (7).
4. Straighten lower end of clamp (8) and remove
coil from magnet.
5. Install new COil, reassemble and reconnect
leads.
If,
for some reason, the entire device is
to
be
replaced, this is accomplished by removing the
fasteners between the shunt trip device frame (3) ,
and supporting bracket (13).
After' replacing either the coil or the entire
shunt trip device, the overtravel adjustment should
be checked.
BELL ALAR,M' AND LOCKOUT
'DEVIC,ES
BELL ALARM DEVICE
, A bell alarm device (see Fig. 22) is available
which operates when an overcurrent trips the
breaker.
It
consists priInarllyof a lever' (7) and
hanger (11) riveted
'to
auxiliary shaft (6), latch! (13),
catch (16){ switch (1)" reset lever (3), and mounting
bracket (4}.
When the' breaker is tripped by an overload,
the overload device
~ill
arm (8) causes lever (7),
hanger (11), and latch (12)
to
rotate
coun~rclock
wise as a single member about pin (9). This
disengages the latch from the catch (16). When the
breaker opens, link (1'7) also releases the catch,
allowing its spring
to
rotate
it
counterclockwise
about pin (15).
This in turn permits pl\1I.lger of
switch
(1) to
move downward, closing the lower
contact of the switch and thereby completing the
alarm circuit.
If
the breaker is opened by means other than
the overload device, the latch (12) remains in
position and does not allow the catch to rotate even
though it is released by link (17).
Operation of the reset lever (3) returns the
catch and switch contacts
to
their original position.
At the same time,
sprin~
(5) resets latch (12).
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" " 2
2
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~
fe,
A
010
020
03 0
040
O,~O I;~P
:3
-·eli-
040'
050
060
B
5
r::o---,I'Im---13
~--IZ
II
I~~~~S--r;='~_:-_--~-~-~
~~FY-k--'8
7
N
-
1. Screws
2.
Spring
3. Frame
4. Pin
7. Coil
B. Clamp
9. Armature
10. Armature Arm
11. Trip Paddle
12. Cllllllp
13.
Supporting
Bracket
Fig. 21
Shunt Tripping Device
24
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