This may be caused if the latch check switch (when
used) is not actuated. Circuit breaker should not close
before trip latch ( 4, Fig. 5) has reset.
Adjustments should be made with latch ( 4) against
reset stop pin ( 3) and turning in adjusting screw ( 1) until
contacts of switch
(2)
"break" (as indicated by an audible
click or check with bell ringer). Retract adjusting screw
until switch contacts "make", then rotate adjusting screw
one turn more. (Adjusting screw is self-locking.)
RACKING MECHANISM
The circuit breaker racking mechanism is adjusted for
proper operation and should not be disturbed unless it is
possible to close the breaker during a racking operation.
It may be possible that interlocked blocking members
are not positioned properly, which should be corrected
as follows:
(See Fig. 6)
With circuit breaker closed, make adjustments by
regulating the length of connecting rod ( 3) for approxi-
METAL-CLAD SWITCHGEAR
18-2807-51
PAGE 7
mately 1/8 inch minimum clearance at "A" between trip
link ( 5) and blocking lever ( 4) with racking lock lever
(2)
held against racking lock bracket ( 1) at "B".
ELECTRICAL OPERATING SEQUENCE
Please refer to the specific schematic diagrams and
other operational information furnished with your order.
RENEWAL PARTS
We recommend sufficient renewal parts be stocked to
insure proper maintenance and replacement of parts.
The quantity of parts and items carried in stock should
be based on the number of circuit breakers in service
and previous operating experience.
When ordering renewal parts, address the nearest
sales office of the 1-T-E Circuit Breaker Company.
Specify the type and serial number of the circuit breaker,
description of part and quantity required.
A copy of applicable Renewal Parts Bulletin will be
furnished on request.
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