Siemens SENTRON 3VL - Page 64

Functions
5.2 Voltage protection
3VL molded-case circuit breakers
64 System Manual, 03/2009, 110 0110 - 02 DS 01
Leading auxililary switch for switching from "OFF" to "ON" (leading NO contact)
/HDGLQJDX[LOLDU\VZLWFK
ZLWKIURQWRSHUDWLQJPHFKDQLVP
&ORVHG
2SHQ
6ZLWFK21


///
6

216
Application example:
If the circuit breaker is equipped with an undervoltage release, and the leading auxiliary
switch is installed in the rotary operating mechanism, the leading NO contacts make it
possible to supply the undervoltage release with power before the main contacts can be
closed.
Leading auxiliary switch for switching off (leading NC contact)
/HDGLQJDX[LOLDU\VZLWFK
ZLWKIURQWRSHUDWLQJPHFKDQLVP
&ORVHG
2SHQ
6ZLWFK2))


///
6

2))6
Application example:
In applications with thyristors, it is necessary to reset the power electronics of the converter
before the main circuit is switched off.
Circuit breakers with leading auxiliary switches create a leading signal that enables selective
deceleration of the thyristor.
Designation of the auxiliary switches and the alarm switches in the circuit breaker, and designation of
the connecting cables
MLFB Pos. 1 Pos. 2 Pos. 3
3VL9400-2AB00/01 NC NO -
3VL9400-2AD00/01 NC NO NO (AS)
Cable designations HS1/2 HS3/4 AS
MLFB Pos. 1 Pos. 2 Pos. 3 Pos. 3
3VL9800-2AC00/01 NC NO NC NO
3VL9800-2AE00/01 NC NO - NO (AS)
Cable designations HS1/2 HS3/4 HS5/6 HS7/8 or AS