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Manual Operations
Motor-wound spring operating mechanism FK3-07
for outdoor circuit breaker
26.04.2011
© ALSTOM
Illustration 27
Crank wheel in position "Bottom dead point"
• The motor-wound spring operating mechanism 70.00 is at the position ON
when the crank wheel 70.30 is at the bottom dead point and the trip spring
70.20 is discharged.
Operating state of
motor-wound spring
operating mechanism
after slow switch-on
Position of position indicator
Spring position indicator
closing spring discharged
The circuit breaker position indicator
is at the position ON, and
the trip spring is charged.
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