Accessories
4.4 Plug-in and draw-out technology
3VA molded case circuit breakers with IEC certificate
290
Manual, 03/2019, A5E03603177010-03
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 191).
To ensure that the electrical connections required by draw-out units can be quickly and
safely disconnected, auxiliary circuit connectors can be installed.
The part of the auxiliary circuit connectors on the circuit breaker side is mounted on the
underside of the molded case circuit breaker using the cable cages and is 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
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 295).
