Function descriptionFunction description
FK 3-12 spring operating mechanismsFK 3-12 spring operating mechanisms
48-020-212EN0248-020-212EN02
Operating statesOperating states
ustrations below ustrations below
possible operating possible operating
sequences of an opersequences of an oper
ating mechanism.ating mechanism.
are characterisedare characterised
mains by the position of the circuit breaker to whichmains by the position of the circuit breaker to which
attached, and by the position of the closing spring. The position of theattached, and by the position of the closing spring. The position of the
spring is always linked to the position of the circuit breaker. Thespring is always linked to the position of the circuit breaker. The
positions of the auxiliary switch and motor limit switch are importantpositions of the auxiliary switch and motor limit switch are important
secondary characteristics.secondary characteristics.
operating state operating state
position is changed by an external control command. It can then passposition is changed by an external control command. It can then pass
through well-defined transient (unsteady) operating states.through well-defined transient (unsteady) operating states.
Operating states andOperating states and
Operating state 3Operating state 3
Closing spring chargedClosing spring charged
Closing spring dischargedClosing spring discharged
spring charged)spring charged)
Closing spring is charged auto-Closing spring is charged auto-
State of deliveryState of delivery
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