2
6
5
3
4
9
8
7
1
11
10
11
M ED I U M VO LTAG E P R O D U C T S
21
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6. Instructions for circuit breaker operation
6.1 Safety indications
Figure 6
Key
1 Key lock
2 Closing spring loading lever
3 Operation counter
4 Housing of the undervoltage release’s mechanical override
5 Indicator for closing springs loaded/relieved
6 Circuit breaker open/closed indicator
7 Closing pushbutton
8 Opening pushbutton
9 Gearmotor protection circuit breaker reset pushbutton
10 Relay trip indicator
11 Relay REF601
Mechanical override of the undervoltage
release (on request)
Undervoltage release enabled. The circuit breaker
can only be closed if the undervoltage release is
supplied with power.
Undervoltage release disabled. The circuit breaker
can also be closed if the undervoltage release is not
supplied with power.
6.2 Operating and signalling parts
VD4 circuit breakers guarantee a minimum
IP3X degree of protection when installed in
the following conditions:
•
fixed circuit breaker, installed behind a
protective metal net
•
plug-in circuit breaker, installed in
switchgear.
In these conditions the operator is totally
protected against accidental contact with
moving parts.
Pay the greatest attention to moving parts
if the circuit breaker is subjected to
mechanical operations outside the
switchgear.
If the operations are obstructed, do not
force the mechanical interlocks and check
that the operating sequence is correct.
The circuit breaker must be gradually
racked-in and out of the switchgear to
avoid shocks that could deform the
mechanical interlocks.
