Alstom FKG1X - Page 72

Function description
FK 3-12 spring operating mechanisms
For circuit
brea
kers
06.04.2011
48-020-212EN02
13/15
•
When motor
limit swit
ch 70.24
is actuated
by motor
limit swi
tch actuat-
ing cam 70.22 at the end of the closing movement, the motor circuit is
made and closing spring 70.25 is automatically recharged.
•
If no breaking operation has taken place during the charging process,
the circuit breaker is in steady operating state 4 at the end of the charg-
ing process. This is the normal operating state of all circuit breakers in
the electric power grid.
•
Circuit breaker
and operating
mechanism
are in
operating state
4.
Operating state
4: steady
Motor Closing
Opening
M
S
1
S
2
S
2
S
1
Y
1
Y
2
•
The
circuit breaker
is ready
for the
operating sequence
O-CO.