Siemens SENTRON 3VA1, Руководство пользователя

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Description
2.2 Ergonomic design
3VA molded case circuit breakers with IEC certificate
Manual, 03/2019, A5E03603177010-03
33
Indication of switching positions in the draw-out unit
The picture below illustrates the colors used to indicate the switching position in the draw-out
unit:
The switching position is indicated in a window of the draw-out unit and is clearly color-
coded, enabling immediate identification of the current switching position of the molded case
circuit breaker.
The draw-out unit has three switching positions:
● CONNECT:
The molded case circuit breaker is connected to the main circuit. The auxiliary circuits are
also closed.
● TEST:
In the TEST position, the main contacts of the molded case circuit breaker are not
connected to the main circuit, but only to the auxiliary circuit. This allows the functionality
of the auxiliary circuit and all of its components (auxiliary switches, auxiliary releases,
communication, etc.) to be tested when the main circuit is open.
● DISCONNECT:
The molded case circuit breaker is not connected to the main circuit nor to the auxiliary
circuit.
● UNBLOCK:
The molded case circuit breaker is not in any of the positions defined above and can be
moved by means of the crank handle.