Siemens 3VA1 100 A Manual page 220

Accessories
4.4 Plug-in and draw-out technology
Auxiliary circuit connectors
3VA molded case circuit breakers or 3VA switch disconnectors are frequently equipped with
internal accessories, e.g. auxiliary switches and auxiliary releases. A broad range of internal
accessory components is also available for the 3VA molded case circuit breaker. For further
information, please refer to chapter Internal accessories (Page 146).
To ensure that the electrical connections required by draw-out units can be quickly and
safely disconnected, auxiliary circuit connectors can be installed.
The breaker-end half is attached to the underside of the molded case circuit breaker and
electrically connected to the internal accessories. Appropriate openings and cable ducts are
provided in the 3VA molded case circuit breaker for routing stranded wires. The socket-end
half of the auxiliary circuit connector with the movable telescopic rail is inserted in the socket
and electrically connected to the customer's installation.
When the molded case circuit breaker is inserted into the draw-out unit, an electrical
connection between the internal accessories in the breaker and the customer's installation is
quickly established.
Note
Plug-in and draw-out units use different versions of the auxiliary circuit connector.
The draw-out version has a longer, movable telescopic rail because the distance to be
bridged in the draw-out socket is longer.
Further details about auxiliary circuit connectors can be found in chapter Auxiliary circuit
connector (Page 231).
Position signaling in the draw-out socket
Several position signaling switches (number depends on socket size) can be installed in the
right-hand side wall of the draw-out socket. These auxiliary switches are capable of signaling
breaker positions DISCON, TEST and CONNECT. The auxiliary switches also output a
position indication signal if the molded case circuit breaker in the draw-out socket is not in
one of the positions specified above. For information, please refer to chapter Position
signaling switches (Page 225).
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3VA molded case circuit breakers
Manual, 04/2015, A5E03603177010-02