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41
IB-65100
Maintenance
13. Choose one of the following steps
according to the TRIP status:
i. If the circuit breaker TRIPPED during
the test performed in step 12,
increase the gap between the trip
coil armature and the latch check
operator by bending the latch
check operator downwards slightly
using channel lock pliers or a small
crescent wrench. Repeat steps 9
through 12.
ii. If the circuit breaker did NOT TRIP
during the test performed in step
12.
14. Slowly depress the trip coil armature
using the manual charge handle.
Position the handle as shown in
Figure 21. Depress the handle until the
armature contacts the feeler gauges.
The circuit breaker should trip.
Note:
Do NOT tilt the armature. Tilting the
armature by applying a load to the
right of the feeler gauges will produce
incorrect results.
15. If the circuit breaker did not TRIP during
the test performed in step 14, remove
the feeler gauges and trip the breaker.
Decrease the gap between the trip coil
armature and the trip lever by bending
the trip lever upwards slightly using
channel lock pliers or a small crescent
wrench.
Note:
Bend the trip lever in very small
increments. This process may take
several attempts.
16. Repeat steps 9 through 15 until the
breaker does not trip with the .090”
gauge inserted in the trip coil armature
gap and does trip with the .030” gauge
inserted into the trip coil armature gap.
Figure 22
Trip Armature Assembly Left View
a
b
c
d
a. 10 - 32 Pan Head Kep Nut
b. Trip Armature Actuator
c. 0.040” Air Gap between the Trip Armature
Actuator & the Latch Check Operator
d. Latch Check Operator
When any maintenance procedure requires
the opening or closing of the circuit breaker
or the charging of any of the stored energy
mechanism springs, exercise extreme caution
to make sure that all personnel, tools, and
other miscellaneous objects are kept well clear
of the moving parts or the charged springs.
Failure to do this may cause serious damage
or injury to the circuit breaker or personnel.
WARNING
WARNING
!
17. Manually charge the main closing
spring using the manual charge handle
per
Ch 4 Installation
,
D. P
LACING
THE
C
IRCUIT
B
REAKER
I
NTO
S
ERVICE
,
4) Mechanical Operation Check.
