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Manual Operations
Motor-wound spring operating mechanism FK3-07
for outdoor circuit breaker
26.04.2011
© ALSTOM
• The pinion shaft 70.97 can be
easily rotated on the spur gear
71.72 by hand until the toothings
of pinion shaft 70.97 and crank
wheel 70.30 are congruent.
Rotate the operating shaft 71.70
counterclockwise using a hand-
held tool with jaw width 6 and the
crank wheel 70.30 will also rotate
counterclockwise.
• When the crank wheel 70.30
reaches the bottom dead point,
the closing spring 70.25 is
discharged.
• Further rotate the operating shaft
71.70 counterclockwise using a
hand-held tool with jaw width 6
until the toothed segment 71.78 is
between the pinions 71.79 of the
slow movement device 70.72.
71.70 70.97 70.30
Illustration 32
70.25
Illustration 33
Illustration 34
71.70 Operating shaft 70.30 Crank wheel
70.25 Closing spring 70.97 Pinion shaft
71.78 Toothed segment 71.79 Pinion of slow movement device
71.78
71.79
71.72
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