Spring Release Latch Insulating Link Closing Spring
Close Cam Moving Contact Assembly Crank Arm
Trip Shaft Manual Charge Handle Manual Charge Device
Roller Constraining Link Pole Shaft Crank Shaft
Trip Shaft Closing Spring Anchor
Main Drive Link Opening Spring
Figure 4-2 Principal Parts in Manually Charged Spring Operated Mechanism
wise pin on the end. A spring forces this pin against the
cam. Another spring holds the front crank assembly in a
clockwise direction against a stop, so that the manual spring-
charge handle socket is normally upright in the unused
position.
The manual charge cam is mounted on the crank shaft so
that the crank pin hooks behind the hook-shaped surface of
the manual charge cam, when the handle is upright and the
springs discharged (Figure 4-3). The springs are fully charged
by an almost 90 degree movement downward of the charg-
ing handle, as previously detailed in Paragraph 4-1.
It is possible to manually recharge the closing springs im-
mediately after closing the breaker and before it has been
tripped open. This results in the springs loading the associ-
ated bearings and latches for long periods. In addition, an
extra close operation or trip-free operation will be necessary
on levering the breaker to the DISCONNECT and REMOVE
positions. Therefore, it is recommended that the springs be
charged just prior to closing the breaker.
4-2 Power Circuit Breaker Operation
On power operated circuit breakers, the closing springs are
normally charged automatically through the use of an electric
motor. In the case of an emergency or lack of control power,
the springs can be charged manually. Figure 4-3 Manually
Operated Spring-Charging Mechanism Details
Closing springs can be charged manually by using the short,
front mounted emergency charging handle. The length of
this charging handle is significantly shorter than its manual
Effective July 2010
Instructional Book IB694C694-03
30
EATON CORPORATION www.eaton.com
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