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18
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
prevent the oscillator pawl (28) from engaging the next
tooth in the ratchet wheel. Thus the oscillator is free and
renders the exact stopping point of the motor not critical.
When the spring release latch is moved below the level of
the stop roller, as later described, the close cam is free to
rotate; and the two closing springs rotate the crankshaft
counterclockwise to close the breaker contacts. They
assume the position shown in Figure 16b and the cam as
in 22c. During rotation, the drive plates move away from
the ratchet wheel pin. The ratchet wheel does not rotate
during the closing operation thus preventing excessive
wear on the teeth and pawls.
Power-operated breakers are also equipped for emer-
gency hand charging the closing springs. Refer to Figure
21. This operation is similar to that of the motor and oscil-
lator except a separate emergency charge pawl (33) is
used to advance the ratchet wheel (17) several teeth on
each stroke of the charge handle (34). This device (26)
also pivots on the crank shaft.
5.1.2.1 Power Operation
The electrical operation of the spring-charging motor cir-
cuit is as follows:
The standard basic schematic and connection diagrams
are shown in Figure 19a and b. Device Y is the anti-pump
relay.
Fig. 14 Arrangement of the Principal Parts of a Power Operated Mechanism. The Close Spring is Shown in the
Charged Position.