Page
24
l.B.
694C694-02
10
@
CD
Spring Release Latch
@Close
Cam
(j) Insulating Link
@ Closing Spring
@Crank
Arm
@Trip
Shaft
0 Roller Constraining Link
®Trip
Shaft
@ Moving Contact Assembly
® Manual Charge Handle
@ Pole Shaft
@ Manual Charge Device
@ Crank Shaft
@ Main Drive Link
@ Closing Spring Anchor
@ 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 sur-
face 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 move-
ment downward of the charging handle, as previously
detailed
in
Paragraph 4-1.
It is possible to manually recharge the closing springs
immediately after closing the breaker and before it has
been tripped open. This results
in
the springs loading
the associated 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 DIS-
CONNECT and REMOVE positions. Therefore, it is rec-
ommended 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.
Effective
07
/97
Courtesy of NationalSwitchgear.com
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