4
4
8
3
10
5
2
6
1
7
9
11
5. Description
5.1. General
The VD4 series of circuit-breakers are pieces of apparatus under vacuum
for indoor installation. For the electrical performances, please refer to
the corresponding technical catalogue code 1VCP000263.
For special installation requirements, please contact ABB.
The VD4 series of medium voltage vacuum circuit-breakers for indoor
installation with lateral operating mechanism are constructed using the
separate pole technique.
Each pole has a vacuum interrupter inside it which, thanks to a special
production process, is incorporated in the resin directly during the cylin-
der moulding stage.
This construction technique ensures protection of the vacuum inter-
rupter against impact, dust and condensation phenomena.
The operating mechanism is the EL type with stored energy and free
release, with opening and closing operations independent of the opera-
tor. The EL operating mechanism is already widely used in all the VD4
series circuit-breakers with front operating mechanism.
Remote control of the circuit-breaker is possible by means of applying
special electrical accessories (geared motor, shunt opening and shunt
closing release, etc.).
The operating mechanism, the three poles and the current sensors (if
provided) are mounted on a metallic frame without wheels. Construction
is particularly compact, sturdy and of limited weight.
The circuit-breakers in the VD4/R series with lateral operating mecha-
nism are “sealed for life” pressure systems (IEC 62271-100 and CEI
17-1 Standards).
Versions available
VD4 circuit-breakers with lateral operating mechanism are available in
the following versions:
– fixed with right lateral operating mechanism and 230 mm pole centre
distance
– fixed with left lateral operating mechanism and 230 mm pole centre
distance
– fixed with right lateral operating mechanism and 300 mm pole centre
distance
– fixed with left lateral operating mechanism and 300 mm pole centre
distance
– with right lateral operating mechanism, version for UniSwitch
switchgear, 210 mm pole centre distance
– with right lateral operating mechanism, version for UniMix, switchgear,
230 mm pole centre distance
– with right lateral operating mechanism, version for UniAir, switchgear,
300 mm pole centre distance.
On request and according to the version, they can be fitted with two or
three current sensors and with the PR521 series overcurrent protection
device.
5.2. Reference Standards
The VD4 circuit-breakers conform to the IEC 62271-100, CEI 17-1 file
1375 Standards and those of major industrialised countries.
5.3. Fixed circuit-breakers
The fixed circuit-breaker (fig. 4) is the basic version complete with struc-
ture and front protection screen. There are two drilled supports in the
lower part of the structure to allow circuit-breaker fixing.
The terminal box (10) is available for the electrical connections of the
circuit-breaker auxiliary circuits,.
The earthing screw is placed in the rear part of the circuit-breaker. For
further details please see the caption to figure 4.
Fig. 4
Caption
1
Lever for manual closing spring charging
2
Signalling device for circuit-breaker open/closed
3
Rating plate
4
Opening pushbutton
5
Closing pushbutton
6
Signalling device for closing springs charged/discharged
7
Operation counter
8
Terminals
9
Earthing screw
10 Delivery terminal box
11 Key lock (circuit-breaker open)
