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Manual Operations
Motor-wound spring operating mechanism FK3-07
for outdoor circuit breaker
26.04.2011
© ALSTOM
Illustration 49
71.70
Closing spring
discharge
70.30
70.97
• 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.
Illustration 50
• When the crank wheel reaches the bottom dead point, the closing spring
70.25 is discharged.
70.25
71.70 Operating shaft 70.30 Crank wheel
70.25 Closing spring 70.97 Pinion
71.72 Spur gear
71.72
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