Page
40
is facing a knife edge pivot on the vertical arm of the bell
crank. The upper end of the link is facing the "Open-
Close" indicator pin. This pin is at the left end of its slot in
the mechanism side frame with the breaker open and at
the right end with the breaker closed. As the close bar is
pushed, the link as two possible end pivots. If the break-
er is open, the upper end of the link will swing to the right
until it touches the indicating pin. The lower end of the
link will then swing to the right and push the vertical arm
of the bell crank to the right. The horizontal arm of the
bell crank moves downward and presses directly on the
spring release latch, allowing the breaker to close.
l.B.
694C694-02
If the breaker is already closed and the close bar is
pushed, the upper end of the spring release latch link
swings free to the right because the indicator pin is not
there to stop it. Consequently, no force is applied to the
vertical arm of the bell crank and nothing else happens.
4-5.10 PADLOCKING PROVISION
Figure 4-15 shows the essential parts of the padlock
interlock. The breaker is padlocked in the trip-free condi-
tion (Figure 3-3). In this condition, the breaker cannot be
closed nor can it be moved with the levering device.
---------
\-
,
~-fol
-j i
~I
-1--/
----1®
I
,~J--'
I
1
t'
___ _
I
I
I \
I
I
a.
Close
Bar
(Normal Position)
b.
Close
Bar
(Released Position)
CD
Spring Release Latch
@ Bell Crank Pivot
Pin
@Bell
Crank
© Spring Release Latch Link
® Spring Release Latch Link Pin
@Close
Bar
<])
Close Bar Pivot Pin
® Open-Close Indicator Pin
® Close-Par Cam
@ Spring Release Device
@ Closing Cam Stop Roller
Figure 4-14 Close Interlock Preventing Efforts to Close Already Closed Breaker
Effective
07
/97
Courtesy of NationalSwitchgear.com
To Next Page
Loading...
