Siemens SENTRON 3WL10, Manual

Page: 154 / 234

Operation
6.1 Operation
Air circuit breaker 3WL10
152
Manual, 11/2017, L1V30499596002-01
Charge the spring energy store of the 3WL10 air 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 enormous energy to be able to withstand substantial short-circuits
(I
cw
value of an air 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 -> Close -> Open
A discharged spring energy store is indicated by the DISCHARGED symbol.
To charge the spring energy store, proceed as follows:
1.
Move the hand lever down 9 times until the spring energy store audibly engages.
The spring energy store is now charged and the status indicator changes to the
CHARGED symbol.