Function description
Function description
FK 3-12 spring operating mechanisms
FK 3-12 spring operating mechanisms
For circuit
For circuit brea
breakers
kers
06.04.2011
06.04.2011
48-020-212EN02
48-020-212EN02
4/15
4/15
Energy store
Energy store
•
•
Closing spring
Closing spring 70.25 stores energy
70.25 stores energy to close
to close the circuit
the circuit breaker and to
breaker and to
charge trip spring 70.20. Surplus energy ensures that the circuit breaker
charge trip spring 70.20. Surplus energy ensures that the circuit breaker
can be safely closed in all situations.
can be safely closed in all situations.
•
•
Trip spring 70.20
Trip spring 70.20 furnishes the energy necessa
furnishes the energy necessary to trip the
ry to trip the circuit
circuit
breaker. The trip spring may be in the operating mechanism or in the
breaker. The trip spring may be in the operating mechanism or in the
circuit breaker, depending on the circuit breaker design.
circuit breaker, depending on the circuit breaker design.
Energy store
Energy store
Cha
Charging
rging mecha
mechanism
nism
•
•
Motor 70.01
Motor 70.01 and gearing
and gearing 79.04 serve
79.04 serve to charge
to charge closing spring
closing spring 70.25
70.25
Closing unit
Closing unit
•
•
On clo
On closing, the
sing, the energy
energy of
of closing sp
closing spring 70.25
ring 70.25 is
is transmitted to
transmitted to cam
cam
disk 70.10 via closing chain 70.26, crank lever 71.43 and closing shaft
disk 70.10 via closing chain 70.26, crank lever 71.43 and closing shaft
70.09. The cam disc
70.09. The cam disc drives main shaft 70.12 via
drives main shaft 70.12 via roller lever
roller lever 70.11. The
70.11. The
circuit breaker is closed and trip spring 70.20 charged via drive lever
circuit breaker is closed and trip spring 70.20 charged via drive lever
70.18 and the linkage
70.18 and the linkage
•
•
Cam disc
Cam disc 70.10 controls t
70.10 controls the travel/time
he travel/time characteristic of
characteristic of the main
the main con-
con-
tact during closing.
tact during closing.
Tripping unit
Tripping unit
•
•
If trip
If trip spring 70.20 is
spring 70.20 is mounted in
mounted in the operating m
the operating mechanism, its
echanism, its energy is
energy is
transmitted to the
transmitted to the circuit breaker via
circuit breaker via trip chain 70.19,
trip chain 70.19, main shaft
main shaft 70.12
70.12
and drive lever 70.18.
and drive lever 70.18.
•
•
The m
The motion is
otion is retarde by
retarde by trip dashpot
trip dashpot 70.17 at
70.17 at the end
the end of the
of the tripping
tripping
process.
process.
Latches
Latches
•
•
When closing
When closing spring 70.25
spring 70.25 is charged,
is charged, closing latch
closing latch 70.05 supports it
70.05 supports it
through crank lever 71.43 and support pin 71.44.
through crank lever 71.43 and support pin 71.44.
•
•
When trip spring
When trip spring 70.20 is c
70.20 is charged, trip latch
harged, trip latch 70.16 supports it
70.16 supports it by the
by the
lever arm of
lever arm of roller lever 70.11 and
roller lever 70.11 and main shaft
main shaft 70.12.
70.12.
Release device
Release device
•
•
Closing
Closing magnet
magnet 70.06
70.06 releases
releases closing
closing latch
latch 70.05.
70.05.
•
•
Trip
Trip magnet
magnet 70.15
70.15 releases
releases trip
trip latch
latch 70.16.
70.16.
Summary of Contents for FKG1X
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