Siemens SENTRON 3WL Reference Manual page 12

3WL Air Circuit Breakers
3WL Air Circuit Breakers/Non-Automatic Air Circuit Breakers up to 6300 A (AC)
General data
Locking devices
Locking device in OFF position
This function prevents closing of the circuit breaker and com-
plies to the specifications for main switches to EN 60204
(VDE 0113) - disconnector unit. This lockout only affects this cir-
cuit breaker.
If the circuit breaker is replaced, closing is no longer prevented
unless the new circuit breaker is also protected against unautho-
rized closing.
To activate the locking device, the circuit breaker must be
opened. The locking device is disabled when the circuit breaker
is closed. The lock is only activated when the key is removed.
The safety key can be removed only in the "OFF" position.
Locking device for "Electrical ON"
(see graphic "Circuit breakers")
This prevents unauthorized electrical closing from the operator
panel. Mechanical closing and remote closing remain possible.
The lock is only activated when the key is removed.
Locking device for "Mechanical ON"
(see graphic "Circuit breakers")
This prevents unauthorized mechanical closing. The mechanical
ON button can only be activated if the key is inserted (key ope-
ration). Closing with the "Electrical ON" button and remote clo-
sing remain possible. The lock is only activated when the key is
removed.
"Secure OFF" circuit breaker-independent locking device
against unauthorized closing
This special switch-independent function for withdrawable cir-
cuit breakers prevents closing and fulfills the specifications for
main switches to EN 60204 (VDE 0113) – disconnector unit. Un-
authorized closing remains impossible even after the circuit
breaker has been exchanged.
To activate the lock, the circuit breaker must be opened. The lo-
cking device is disabled when the circuit breaker is closed. The
lock is only activated when the key is removed. The safety key
can be removed only in the "OFF" position.
Locking device for crank handle
Prevents removal of the crank. The circuit breaker is protected
against movement. The lock is only activated when the key is
removed.
Locking device for "Mechanical OFF"
Prevents unauthorized mechanical opening from the operator
panel. The "Mechanical OFF pushbutton" can only be activated
if the key is inserted (key operation). Remote opening remains
possible. The lock is only activated when the key is removed.
Locking device for hand-operated lever
The hand-operated lever can be locked with a padlock. The sto-
rage spring cannot be loaded manually.
Locking device against resetting the "tripped" indicator
A lockable cover prevents manual resetting of the "tripped" indi-
cator after overcurrent tripping. This locking device is supplied
together with the transparent cover for solid-state releases.
12 Siemens · 2009
Sealing devices
Sealing cap for "Electrical ON" button
The "Electrical ON button" is equipped with a sealing cap as
standard.
Sealing cap for "Mechanical ON" and "OFF" button
The locking set contains covering caps which can be sealed.
Sealing device for solid-state releases
The transparent cover can be sealed. The parameter setting
sections are covered to prevent unauthorized access. Openings
allow access to the query and test button.
Locking mechanisms
Locking mechanism against movement for withdrawable circuit
breakers when the control cabinet door is open
The crank handle is blocked when the control cabinet door is
open and cannot be removed. The withdrawable circuit breaker
cannot be moved. The lock only affects the inserted crank
handle.
Locking of the control cabinet door
The control cabinet door cannot be opened if
• The fixed-mounted circuit breaker is closed (the blocking
signal is transmitted via the Bowden wire) or
• The withdrawable circuit breaker is in the connected position.
Blocking mechanism using "Mechanical ON" and "OFF" buttons
The "Mechanical ON" and "OFF" buttons are covered with a cap
which only allows actuation with a tool. These covering caps are
part of the locking set.
Optional equipment for guide frames
Shutters
The sealing strips of the shutter seal the laminated contacts of
the guide frame when the withdrawable circuit breaker is remo-
ved and therefore implement touch protection.
The sealing strips can be manually opened using the strip
levers.
The position of the sealing strips can be locked in various posi-
tions using padlocks for securing against tampering.