Instruction Book
Page 26
Effective: May 2016
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IB131017EN
The circuit breaker and cassette are designed such that
the lower portion of the circuit breaker (the cradle) is held in
the DISCONNECT/TEST position by two shoot bolts which
fit into the rectangular slots of interlock plates located on
each side of the cassette's frame. The shoot bolt handle
can be in either Position "B" (partially engaged) or Position
"A" (not engaged) for the breaker to be in the DISCON-
Figure 4-7 Shoot Bolt Handle Shown in Position "C" -
Shoot Bolts Protrude Fully From Cradle
Figure 4-8 Shoot Bolt Handle Shown in Position "B" -
Shoot Bolts Protrude Partially From Cradle
Figure 4-9 Shoot Bolt Handle Shown in Position "A" -
Shoot Bolts Retracted Fully Inside Cradle
NECT position. The shoot bolt handle
must,
however, be
in Position "C" (fully engaged) to be the TEST position and
before the circuit breaker can be levered to the CONNECT-
ED position as dictated by the design's mechanical inter-
locking system. Levering of the circuit breaker is discussed
in paragraph
4-6.4.
The three shoot bolt handle positions
(A, B and C) are shown Figures
4-7, 4 - 8
and
4-9
).
Retract the shoot bolts by pushing the shoot bolt handle
down to Position "A" (Figure
4-9
) and push the circuit
breaker the rest of the way into the cassette against the
stop. At this point, the front of the cradle will be flush with
the front of the cassette. Rotate the shoot bolt handle up to
Position "B" (Figure
4-8
) permitting the shoot bolts to
protrude partially into the rectangular slots of the interlock
plates on each side of the cassette. The circuit breaker is
now held in the DISCONNECT position.
For the circuit breaker to be in the TEST position, the
secondary connection must be made between the breaker
and the cassette. Refer to paragraph
4-6.3
for details on
making secondary connections to the cassette.
Once the secondary connection is made and the shoot bolt
handle is in Position "C" (fully engaged), the circuit breaker
can be levered from the TEST position to the CONNECT-
ED position. For the circuit breaker to reach its
CONNECTED position, it must be manually levered to that
position as described in paragraph
4-6.4.
When the circuit
breaker is levered to the CONNECTED position, the lower
cradle portion remains locked in the position dictated by the
shoot bolts. The upper portion of the circuit breaker moves
into the structure to the CONNECTED position.
4-6.3 DRAWOUT ELECTRICAL INTERFACES
Circuit Breaker Secondary Connections
Secondary connections are made through the use of an
umbilical cord (Figure
4-10).
The secondary connector on
the breaker end of the cord is connected to its compatible
secondary connector located under a protective hood on
the upper front portion of the circuit breaker (Figure
4-11
).
This connection is already made when the breaker is
shipped from the factory.
If there is a need to make this
connection in the field, it can be simply accomplished as
follows: Connect the breaker side connector of the
umbilical cord to the circuit breaker's connector. Once the
push-in connection is made, the breaker end of the
umbilical cord is secured in place with two self threading
screws that screw into two mounting holes in the top of the
breaker's secondary mounting hardware. With the breaker
end of the umbilical cord securely in place, take the
cassette end of the umbilical cord and carefully lay it over
the front of the circuit breaker in preparation for movement
of the breaker into the cassette (Figure
4-10
).
At this point,
the circuit breaker is ready to be inserted into its cassette.
Refer to paragraph
4-6.2
for details on positioning of the
circuit breaker for insertion into its cassette.