Circuit diagrams
3VL IEC molded case circuit breakers
System Manual, 11/2013, 110 0110 - 02 DS 03
299
OFF (to be provided by customer)
ON (to be provided by customer)
S01 Remote command (to be provided by
S3 Alarm switch (to be provided by customer)
Fuse in the control circuit
Fuse in the control circuit
K1 Auxiliary contactor (to be provided by
PE Protective grounding
Figure 13-6 Motorized operating mechanism with stored energy mechanism for VL160X, VL160,
VL250, VL400, VL630 and VL800 with undervoltage release
Note
Automatic charging/close
A separate alarm switch contact (7
-
8) can be connected for automatic charging after tripping.
Automat
ic switching on of the molded case circuit breaker must be prevented, otherwise
after a tripping event it may automatically switch to short
-circuit.
The contact of auxiliary contactor K1 or K3 prevents no-load operation of the molded case
circuit breaker when the undervoltage release "U<" is without power. No-load operations
represent a high level of stress for the molded case circuit breaker. If the undervoltage
release is without power, auxiliary contactor K1 or K3 has not picked up. The contact in the
ON circuit (control circuit) of the motorized operating mechanism is thus not closed, that is,
the molded case circuit breaker cannot be switched.
This auxiliary contactor is not necessary in principle when the undervoltage release is
supplied uninterrupted (e.g. pushbutton S01) from the same source as the motorized
operating mechanism itself (e.g. contact 4).
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