34
Instruction Booklet IB 33-790-1J
Effective November 2010
Instructions for Low Voltage Power
Circuit Breakers Types DS and DSL
EATON CORPORATION www.eaton.com
because the crank handle is still being used to move
the breaker in the final part of its travel to the DIS-
CONNECT position. Thus, the trip plate is still
pushed in and consequently the breaker is trip free.
2. Figure 30a, b, c, and d shows the essential parts of
the spring discharge interlock. a and b show the
levering device in the REMOVE position. The Inter-
lock Plate has two horizontal pins 7 and 8 extending
from it, as shown in a, b, c and
d. The upper one is
designated arbitrarily as Pin A and is darkened to
distinguish it from Pin B. In levering the breaker out to
the REMOVE position as shown in a and b the lever-
ing shaft has turned counterclockwise until the lever-
ing device arms are horizontal to the rear. As it
rotates, the close bar cam has been rotated counter-
clockwise by Pin B. to the CLOSE position. This
releases the spring release latch through the linkage
sh
own in Figure 30, which results in a trip-free opera-
tion of the breaker if the closing springs are charged.
This happens because the levering device crank has
the Trip plate held in the Trip Position. If the breaker
is manually operated, levering out can be stopped at
the TEST position. Remove the levering device crank
handle and (1) Close the breaker and (2) Trip the
breaker. This will discharge the springs so that, when
the REMOVE position is reach
ed, there will not be a
trip-free operation. The Close bar will merely be
pulled into the “CLOSE” position.
Fig. 29 Relation of Shutter, Interlock Cam and Levering Device Arms.
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