Distribution Breaker Section 3 Descriotion
prevents counter rotation while the handle is returning
for another stroke. Six to eight complete strokes of the
manual handle are required for one complete spring
charging operation.
The mechanism is mechanically trip-free in any position
on the closing stroke. Electrically energizing the trip coil
while closing, after the auxiliary switch contacts change
position, will rotate the trip latch and permit the circuit
breaker to open hIlly. The linkage will reset as in a
normal open operation and the closing spring will
recharge.
Breaker Open Spring Discharged
A
:)
4. TRIP ROLLER
5. CLOSING CAM
6. TRIP LINK
7a. CLOSING TOGGLE
7b. CLOSING TOGGLE
8. PROP SPRING
9. LINKAGE RETURN SPRING
10. CLOSING ROLLER
11. PROP
12. OUTPUT CRANK
13. JACKSHAFT
14. TRIP LATCH
Note: Shading indicates fixed pivots.
Breaker Open Spring Discharged
B
Figure 3. Toggle Linkage Positions of the ML-18H Mechanism
(View from Right Hand Side)
fi
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