Circuit diagrams
3VL molded-case circuit breakers
System Manual, 03/2009, 110 0110 - 02 DS 01
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Figure 14-7 Stored-energy motorized operating mechanism
Table 14- 5 Stored-energy operator for VL160X, VL160, VL250, VL400, VL630 and VL800 with
undervoltage release
S0 OFF (to be provided by customer) S1 ON (to be provided by customer)
S01 Remote command (to be provided
by customer)
-F1, -F2 Control circuit fuse
K1 Auxiliary contactor (to be provided
by customer)
U< Undervoltage release
PE Protective grounding
Note
Automatic charging/close
A separate alarm switch contact (7-8) can be connected for automatic charging after tripping.
Automatic switching on of a circuit breaker must be prevented, otherwise a short-circuit could
automatically occur after a tripping event.
The contact of auxiliary contactor K1 or K3 prevents no-load operation of the circuit breaker
when the undervoltage release "<U" is without power. No load operations represent a high
level of stress for the 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 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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