Floor Interlock and Operating Lever
The circuit breaker interlocking system prevents closing
the circuit breaker while the circuit breaker is being le-
vered into or out of the CONNECTED position.
This is done by the Floor Interlock and the Automatic Trip-
ping Lever
(Figure 2).
In operation, the rear end of this
lever is pushed upward by a floor cam on the very first
movement of the circuit breaker from the TEST position
toward the CONNECTED position, or from the CON-
NECTED position toward the TEST position.
The lifting of the Tripping Lever, through its connected link-
age, lifts the tripping-trigger, and the floor cam holds it in
this tripped position as long as the circuit breaker is not at
one of its limits of travel. If there is an attempt to close the
circuit breaker while it is not completely in the CONNECTED
or TEST positions, the mechanism will cause a trip free
operation and the circuit breaker contacts will not close.
Figure 1a.
Positions of the Levering Device
Figure 1b. Levering Device
Figure 1c. Vehicle Rear View
Figure 2.
Floor Interlock and Operating Lever
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