Siemens Sentron 3VA Manual page 237

Defined positions
● CONNECT position: The molded case circuit breaker is connected to the main circuits.
The auxiliary circuits are also electrically connected to the installation via the auxiliary
circuit connectors.
This is the normal operating position of the molded case circuit breaker.
● TEST position: The main circuits are not connected to the installation. The auxiliary
circuits are connected to the installation via auxiliary circuit connectors.
The auxiliary circuits can be function-tested with the breaker in the TEST position even
when the installation itself is not live.
● DISCON position: Neither the main circuits nor the auxiliary circuits are connected to the
installation.
The molded case circuit breaker is electrically isolated.
If the molded case circuit breaker is not in any of these defined positions, the breaker status
indicator displays the word UNBLOCK on a white background. When the breaker is in this
position, its main contacts cannot be closed if the autotrip plunger is correctly installed (see
below).
Move the molded case circuit breaker into a defined position
NOTICE
Irreparable damage to the racking mechanism when rotated in wrong direction
The following operations will lead to irreparable damage of the draw-out socket gear:
• Molded case circuit breaker is in DISCONNECT position:
• Molded case circuit breaker is in CONNECT position:
In the situations described above, pay attention not to turn the crank handle in the indicated
direction.
Note
Once the circuit breaker has been moved into the position CONNECT, TEST or DISCON,
the sliding clutch of the crank gear is disengaged and additional rotation of the crank handle
has no effect.
By removing and reinserting the crank handle, it is possible to reengage the gear. The
breaker status indicator will then show UNBLOCK. The molded case circuit breaker can now
be moved to a new position.
1. If the crank handle is inserted in the crankcase, pull it out.
2. Insert the crank handle into the crankcase again.
By removing and reinserting the crank handle, it is possible to reengage the gear.
3. Turn the crank handle until the breaker status indication shows the required position.
3VA molded case circuit breakers with UL and IEC certification
Manual, 01/2019, L1V30435333-01
Insertion of the crank handle (position indicator changes to UNBLOCK) and
counterclockwise turning of the crank handle toward DISCONNECT.
Insertion of the crank handle (position indicator changes to UNBLOCK) and clockwise
turning of the crank handle toward CONNECT.
4.4 Plug-in and draw-out technology
Accessories
235