Siemens 3VA1 100 A Manual page 204

Accessories
4.4 Plug-in and draw-out technology
Cable connection
With plug-in and draw-out circuit breakers, the cables or busbars are connected to the plug-
in socket or the draw-out socket. The termination areas for these versions are designed in
the same way as those of the molded case circuit breaker, i.e. all the connection technology
which is available for 3VA molded case circuit breakers can be used in the same way for the
plug-in and draw-out sockets.
3VA plug-in and draw-out units
Plug-in and draw-out technology as it is implemented in 3VA molded case circuit breakers is
described below. But 3VA switch disconnectors in MCCB design can also be converted to
plug-in or draw-out technology. The information given below therefore applies analogously to
3VA switch disconnectors.
Formation of arcs between contacts and irreparable damage to circuit breakers and
installation
When the 3VA molded case circuit breaker is moved into or out of the socket when the
main contacts are closed (breaker position ON), arcs can form between contacts and result
in irreparable damage to the circuit breaker or the electrical installation, and possibly cause
physical injury to personnel.
Do not move the 3VA molded case circuit breaker into or out of the plug-in socket or the
socket of the draw-out unit unless the main contacts are open, i.e. unless the breaker is in
the OFF position.
Before moving the molded case circuit breaker into or out of the socket, use the handle to
switch it to the OFF position. In order to prevent operating errors, 3VA molded case circuit
breakers are equipped with an autotrip plunger when they are converted to plug-in or draw-
out units. This plunger automatically trips the circuit breaker (breaker position TRIP) and thus
opens the main contacts whenever an attempt is made to move a unit into or out of the
socket when the breaker contacts are closed.
204
WARNING
3VA molded case circuit breakers
Manual, 04/2015, A5E03603177010-02