Bell Alarm Anrl Lockout Device - GE AK-2A-15 User Maintenance Manual

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alternate breaker presents a convenient method
of mechanically interlocking two or more breakers
to assure that no two breakers may be closed at
the same time.
B ELL ALARM SWITCH AND
LOCKOUT ATTACHMENTS
(Figure 30)
The bell alarm device is mounted on top of
the horizontal cross frame member just to the
left of the mechanism frame when the breaker
is viewed from the front. This device operates
a switch with two sets of contacts, one normally
open, the other normally closed. The switch may
be used to open or close an external circuit,
giving a bell or light indication of a protective
trip device operation.
If
the breaker is tripped open by any means
other than the manual trip button or the shunt
trip device, the bell alarm mechatiism is activated.
The alarm is shut off and the bell alarm and
lockout mechanism is reset by operation of the
manual trip button or shunt trip device.
device is a bell alarm only, the bell alarm mech­
anism is also reset simply by closing the breaker.
4 ----.lr- -- -- --
1 . Link
2 . Lever
Pi n
3.
4. Trip Shaft
5 . Trip Paddle
6. Link
Power Circuit Breakers Types AK-2 -15 and AK-2/3-25 GEI -50299
If the
Figure 30. (695C1 58) Bell Alarm anrl Lockout Device
7.
8.
9.
10.
1 1 .
12 .
OPERATION
Lever (2) is connected to the breaker mech­
anism so that when the breaker opens lever (2)
rotates counterclockwise about pin (14).
motion is transmitted through links ( 1 ) and (13)
to paddle (12) which operates bell alarm switch
If the device has the lockout feature, the
( 1 1 } .
movement of link (13) also causes lockout link
(8) to slide in a direction that results in its
striking trip paddle '5) which, by displacement of
the breaker mechanism trip latch, makes it im­
possible to reset the breaker mechanism until
the bell alarm mechanism is reset.
Link (6) serves as a latch in the bell alarm
mechanism. If
to rotate about its lower pin.
linkage of its normally fixed center of rotation
about pin (15) and defeats both the bell alarm and
the lockout operation.
manual trip button or the shunt trip device will
displace latch (6) and have this effect.
the breaker is tripped by either of these means,
the bell alarm and/or lockout will not operate.
Also, operation of either of these devices will
reset the switch and inactivate the lockout.
Trip Arm
Lockout Link
Frame
Link
Switch
Paddle
it is displaced, link (10) is free
This deprives the
Operation of either the
TYPICAL CON NECTION
DIAG RA M
13. Link
14. Pin
1 5. Pin
1 6. Springs
1 7 . Spring
The
Thus if
3 5