Siemens SINOVA Manual page 217

Glossary
Racking rail
Moves the Circuit Breaker in the guide frame.
Rated current coding
The rated current is coded in the factory. Thus every Circuit Breaker can only be used in a
guide frame with the same rated current.
Ready-to-close signal switch
This auxiliary switch is actuated depending on the ready-to-close status of the Circuit Breaker.
Safe OFF
This additional function prevents the Circuit Breaker from closing and fulfills the isolation
condition in the OFF position according to IEC 60947-2:
• "Mechanical OFF" button pressed
• Main contacts open
• Withdrawable Circuit Breakers: racking handle removed
• The various interlocking conditions are fulfilled
Secondary disconnect terminals coding
The secondary disconnect terminals can be coded to prevent the connecting terminals from
being connected incorrectly.
Shunt release (F1, F2)
For remotely opening the Circuit Breaker and blocking it against closing.
Shutters
Shutters are molded-plastic plates for covering live main conducting paths in the guide frame
(shock-hazard protection). If the Circuit Breaker is racked to the disconnected position, the
shutters are moved over the uncovered contact gaps.
Spring charging lever
The stored-energy spring mechanism is charged by means of a series of pump movements
(five actuations of charging lever).
Spring-charging motor
A geared motor automatically charges the stored-energy spring as soon as voltage is applied
to the auxiliary supply connections. After one closing operation, the stored-energy spring is
again automatically charged for the next closing operation.
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Operating Instructions, 12/2022, L1V30828903001-01
3WJ Air Circuit breakers