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5.
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
1VCP000001.
For special installation requirements, please con-
tact ABB.
The following versions are available:
– fixed
– withdrawable for UniGear ZS1 type and UniSafe
switchgear.
5.3.1. General characteristics of fixed circuit-breakers
Circuit-breaker
Standards
Rated voltage
Rated insulation voltage
Withstand voltage at 50 Hz
Impulse withstand voltage
Rated frequency
Rated normal current
(40 °C)
Rated breaking capacity
(rated symmetrical short-
circuit current)
Rated short-time
withstand current
(3 s)
Making capacity
Operation sequence
Opening time
Arcing time
Total breaking time
Closing time
Maximum overall dimensions
Pole centre distance
Standardised table of dimensions
Operating temperature
Tropicalisation
Electromagnetic compatibility
6
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Description
VD4 12
IEC 62271-100
CEI 17-1 (File 1375)
Ur [kV]
12
12
Us [kV]
28
Ud (1 min) [kV]
75
Up [kV]
50-60
fr [Hz]
Ir [A]
630
630
16
16
Isc [kA]
20
20
25
25
31.5
31.5
16
16
Ik [kA]
20
20
25
25
31.5
31.5
40
40
Ip [kA]
50
50
63
63
80
80
[O-0,3s-CO-3min-CO]
40 ... 60
[ms]
[ms]
10 ... 15
50 ... 75
[ms]
[ms]
60 ... 80
461
461
H [mm]
450
570
W [mm]
424
424
D
[mm]
150
210
I [mm]
TN7405
TN7406
– 5 ... + 40
[°C]
IEC: 60068-2-30
721-2-1
IEC: 60694, 61000-6-2
61000-6-4
5.2. Reference Standards
The VD4 circuit-breakers conform with the IEC
62271-100, DIN VDE 0670, CEI 17-1 file 1375
Standards and those of major industrialised coun-
tries.
5.3. Fixed circuit-breaker
The fixed circuit-breaker (fig. 4) is the basic ver-
sion complete with structure and front protection
screen. The fixing holes are made in the lower
part of the structure.
For the electrical connections of the circuit-
breaker auxiliary circuits, the terminal box (10)
is available (also see par. 7.8.1.).
The earthing screw is placed in the rear part of
the circuit-breaker. For further details, please see
the caption to figure 4.
1250
1250
1600
1600
16
16
–
–
20
20
20
20
25
25
25
25
31.5
31.5
31.5
31.5
16
16
–
–
20
20
20
20
25
25
25
25
31.5
31.5
31.5
31.5
40
40
–
–
50
50
50
50
63
63
63
63
80
80
80
80
461
461
599
599
450
570
570
700
424
424
424
424
150
210
210
275
TN7405
TN7406
TN7407
TN7408
2000
2000
2500
–
–
–
20
20
20
25
25
25
31.5
31.5
31.5
–
–
–
20
20
20
25
25
25
31.5
31.5
31.5
–
–
–
50
50
50
63
63
63
80
80
80
599
599
616
570
700
700
424
424
424
210
275
275
TN7407
TN7408
TN7408
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