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Vehicle Description
The spring dump tube now more fully elevates the mecha-
nisms trip push rod cam and closing spring release cam
(each attached to the same push rod). The spring release
cam contacts and displaces the close latch lever causing
release of the closing springs into a trip free mechanism.
Thus all spring energy is discharged as the circuit breaker
leaves the cubicle.
The spring dump roller must now overtravel the structural
actuating angle and not be allowed any further elevation.
The spring dump push rod accommodates this overtravel
by employing a number of collars and bellville washers.
The upper most collar is fixed and provides a definite stop
after approximately (0.88 inches) displacement. The ad-
ditional motion of rollers and levers required to complete
overtravel is allowed by compression of the bellville wash-
ers. The collar immediately above the belleville washers
is fixed, and the one below free to slide.
Continuous Current Interlock
Reference Figure 4
The continuous current interlock functions to ensure break-
ers and cubicles of like continuous rating are applied, and
that circuit breakers with dissimilar continuous current rat-
ings are excluded from cubicles of unlike current ratings.
Figure 4 provides detail necessary to determine continu-
ous current ratings and appropriate interlock orientation.
Control Cable and Connection Box
The FSV type circuit breakers employ a plug-in-cable which
completes all standard circuit breaker electrical connec-
tions between the mechanism housing and the vehicles
secondary disconnects. Figure 5 provides the detail of the
cables wiring and a typical schematic diagram.
The wiring from this cable is terminated at a connection
box which provides a convenient and versatile means of
accommodating various control options and modes of
common sourcing while maintaining a common circuit
breaker enclosure wiring diagram.
Devices which will be mounted in the connection box
include:
• Plunger Position Mechanical Interlock Switch
• Terminal Blocks
• Capacitor Trip (Optional)
Insulating Barriers
Insulating barriers are required for use on type FSV circuit
breakers.
Interphase and exterior barriers are removed or inserted
by sliding them in the vertical channels.
Type FSV circuit breakers require a full compliment of two
exterior and two interphase barriers.
Front Hinged Panel, Type FSV
Reference Figure 6.
The FSV circuit breaker employs a hinged front panel which
is spring loaded to seek a vertical position. Helical exten-
sion springs maintain tension in aramid fiber cords which
are trained over guides to apply a horizontal pull on the
front panel towards the rear of the circuit breaker.
If the front panel fails to move easily and freely against the
spring tension. DO NOT FORCE. STOP! Examine aramid
cord to ensure it is aligned over each of two guides.
Tensioned cords are applied symmetrically to each side of
the front panel. Helical springs may be accessed by re-
moving the front lower panel of the circuit breaker.
Figure 6. Hinged Front Panel
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