Siemens SENTRON 3WL10 Manual page 198

Operation
6.1 Operation
Charging the spring energy store of the circuit breaker
The spring energy store transmits its energy to the contact system during the opening
operation of the circuit breaker and is then discharged. The contact system will now stay
together with this energy to be able to withstand substantial short-circuits (I
circuit breaker). After this transfer to the contact system, the spring energy store can
immediately be charged with stored energy again (circuit breaker is in the CLOSED
position).
The contact system can also be opened at any time without additional energy input. This
means, when the circuit breaker trips, it transmits this stored energy of the spring energy
store to the contact system and the circuit breaker can be reclosed immediately.
This enables the following switching sequence in the CLOSED state and with the spring
energy store CHARGED: Open ⇒ Closed ⇒ Open
A discharged spring energy store is indicated by the DISCHARGED symbol.
To charge the spring energy store, proceed as follows:
The spring energy store is now charged and the status indicator changes to the CHARGED
symbol.
Close circuit breaker
The spring energy store can then be charged again.
Open circuit breaker
The circuit breaker opens the contacts to the current paths. The switch position indicator
changes to the OPEN symbol.
The status and the status indicator of the spring energy store do not change.
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1. Move the manual lever down 9 times until the spring energy store
audibly engages.
1. Check whether the spring energy store is charged.
2. Press the "Mechanical ON" pushbutton
The circuit breaker closes the contacts to the current paths. The switch
position indicator changes to the CLOSED symbol and the spring energy
store changes to the DISCHARGED state.
1. Press the "Mechanical OFF" pushbutton
3VA27 molded case circuit breakers & 3WL10 air circuit breakers
value of an air
cw
Manual, 10/2018, L1V30499596002-01