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M E D I U M V O LTA G E P R O D U C T S
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6. Instructions for circuit-breaker operation
6.1. Safety indications
Key
1 Key lock (if applicable)
(*)
2 Lever for manual
loading of closing
spring
3 Lever seat for racking-
out operation (only for
withdrawable circuit-
breakers)
4 Opening pushbutton
5 Closing pushbutton
6 Signaling device for
circuit-breaker open/
closed
7 Signaling device for
closing spring loaded/
discharged
8 Operation counter
9 Handles for operating
truck locks (only for
withdrawable circuit-
breakers)
10 Operating lever for
circuit-breaker
racking-in/out
(*) Warning! To activate
the key lock: open
circuit-breaker, press
and hold opening
pushbutton, then turn
key and remove it from
its seat.
VD4G circuit-breakers provide at least
IP2X protection class if installed in the
following conditions:
• fixed circuit-breaker, installed behind
a protective metal net
• withdrawable circuit-breaker,
installed in switchgear.
In these conditions the operator is to-
tally protected against accidental con-
tact 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 but
check that the operating sequence is
correct.
1
4
2
6
9
3
10
Fig. 6
The circuit-breaker must be gradually racked-in and
out of the switchgear to avoid shocks that could
deform the mechanical interlocks.
For safety reasons, if it is impossible to establish
whether the circuit-breaker is open or closed, it
must be considered closed and live to all effects.
In this case, none the high voltage connections
towards the primary side of the circuit-breaker must
be supplied and all must be potential-free.
This condition must be confirmed before any tests,
maintenance work, repairs and successive putting
into service operations are performed.
23
5
7
8
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