GE AK-1-15 Maintenance Manual

EL ECTR IC AL TRIPPING
-
The breaker may be tripped electrically by any
of tha
electrical tripping devices described in
these instructions. . The breaker may also be
tripped by the automatic overcurrent or reverse
current tripping devices, if so equipped. All
these devices trip the breaker inasimilarmanner,
i.e. ·the device trip arm moves against the trip
paddles fastened on the trip shaft , thus rotating
the
trip shaft and displacing the trip latch.
The
most commonly used tripping device is the
shunt trip device connected in the control circuit
as shown in Fig. 1. When a tripping signal is given,
the shunt
trip coil is energized through a nortrlally-
open auxiliary switch "
a" -contact, thus tripping
· tbe
breaker.
. .
MAINTENANCE
BEFORE INSPECTION OR ANY MAINTENANCE
WORK IS DONE BE SURE THAT THE BREAKER
IS IN THE OPEN POSITION. ALL ELECTRICAL
POWER, BOTH PRIMARY
AND · CONTROL
SOURCES, SHOULD
ALSO BE DISCONNECTED.
Warning: On
breakers employing stored-en-
ergy closing mechanisms, care must be taken
when the
circuit breaker is being installed
and when any inspection or maintenance work
is being done so that the breaker is in the
open·
position and the closing springs are
· being re15trained by the safety pin. The proce-
dure for inserting the safety pin is given below.
- INSERTING SAFE TY PIN -
AK -5 0, - 75 and -100 ·
. (Fig •. 3) . .
The closing sprini ~hould be charged with the
maintenance handle
(1) so that the safety pin (3) -
can be
placed in the hole of the push rod (2).
Continue to op
er . ate the maintenance· handle, clos-
ing the breaker. This is done so that the safety
pin
takes the SJ?ring force .
- To il)stall the
safety pin of the manµal stored -
energy mechanism
refer to the section entitled
STORED- ENERGY MANUAL MECHANISM on page
17 of these instrucUons.
With the safety pin
restraining the closing
spring force, the. contacts will close s.lowly when ·
the
breaker is manually operated a1lowing the
operation of the mechanism and the contact align-
ment ~o be visually observed.
. . -
. !allowing the inspection period, the closing
sprmgs must be recharged, the safety pin removed
from the push rod, and the pin placed in the retain-
ing spring clip adjacent to the push rod.
Low Voltage Power Circ~it Breakers GEK-7303
Fig. 3 {8039670) View showing operation of
· AK-2-50 ·
breaker with manual maintenance
handle and installation. of safety pin,
1.. Manual maintenance 'Handle
2.
Push Rod
3. Safety Pin
INSPECTI ON
Periodic inspection of the circuit break~r is
recommended · at least once a year. · More fre-
quent inspections are recommended if severe
load. conditions, dust, moisture or _ other unfavor
able conditions
exist. A complete inspection
.of the
breaker, including contacts and arc quenchers,
should always
be made after the breaker has in-
terrupted a short-circuit.
At regular inspection periods the breaker should -
be
operated manually; (stored energy mechanisms ·
with the
safety pin restraining the closing spring
force)
fo observe the contact alignment and to
make
sure all mechanism parts move freely
without binding
or excessive friction.
If the breaker remains -open or closed for a·
period of six months or more, it is recommended
that arrangements . be made to open and close it
several times in succession, . preferably under.
load.
If overheating, not caused by overcurrent, is
observed, a complete inspection of the breaker
should be made including connections and contacts.
5

GE AK-1-15 Specifications

General

Brand	GE
Model	AK-1-15
Category	Circuit breakers
Language	English