Siemens SENTRON 3WL10 Series Manual page 26

Description
2.3 Basic unit
Racking the circuit breaker
The circuit breaker is racked in and out of the guide frame using a racking handle.
When the racking handle is not in use, it can be stowed in the right-hand side wall of the
guide frame.
Circuit breaker positions in the guide frame
Using the racking handle, the circuit breaker can be put in three different positions in the
guide frame:
● CONNECT:
The air circuit breaker is connected to the main circuit. The auxiliary circuits are also
closed.
● TEST:
In the TEST position, the main contacts of the air circuit breaker are not connected to the
main circuit, but only to the auxiliary circuit.
In this position, the functionality of the auxiliary circuit and all of its components (auxiliary
switches, auxiliary releases, communication, etc.) can be tested while the main circuit is
open.
● DISCON:
The circuit breaker is not connected to the main circuit nor to the auxiliary circuit. In the
DISCON (DISCONNECT) position, it can be removed from the guide frame.
The circuit breaker position is indicated below the hole for inserting the racking handle.
When the circuit breaker arrives at one of the positions during racking, it engages in this
position. Further racking is then only possible once the pushbutton for unlocking racking
(Push before Operating) has been pressed.
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Air circuit breaker 3WL10
Manual, 11/2017, L1V30499596002-01