11
Safety indications
All VD4 circuit-breakers guarantee a minimum
IP2X degree of protection when installed in
switchgear.
The operator is fully guaranteed against
accidental contact with moving parts under these
conditions.
Should mechanical operations be carried out on
the circuit-breaker outside the switchgear, take
great care of the moving parts.
The CB is provided with an interlocking
mechanism.
The interlocking device prevents closed CB from
being transferred to the connected or isolated
position, and against closing of CB during its
movement in the cubicle.
If the operations are prevented, do not force the
mechanical interlocks and check that the
operating sequence is correct.
Racking the circuit-breaker in and out of the
switchgear must be done properly to avoid
shocks, which may deform the mechanical
interlocks.
Switching and signaling parts
(figure 11.1)
Legends of figure 11.1
1 Front cover
2 Opening push button
3 Closing push button
4 Indication for circuit-breaker OPEN / CLOSE
5 Indication for closing spring charged /
discharged
6 Operation counter
7 Lever for manually charging the closing spring
8 Rating plate
9 Earthing contact
10 Cable stem
Circuit-breaker closing and
opening operations
Circuit-breaker operation can be either manual or
electrical (Figure 11.1).
a) Manual closing spring charging for VD4
circuit- breakers in earthed-test position
Repeatedly activate the charging lever (7)
(maximum rotation angle of the lever: about
90°) until the yellow indicator (5) appears.
The maximum forces which can normally be
applied to the lever are <250 N for EL3
operating mechanism.
b) Electrical spring charging operation
On request, the circuit-breaker can be fitted
with the following accessories for electrical
operation:
• Geared motor for automatic closing spring
charging
• Shunt closing release
• Shunt opening release
—
Instructions for VD4 CB operations
—
Fig 11.1 - VD4 basic version
10
2
4
7
8
9
1
3
5
6
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