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Switch Disconnectors
3VT Switch Disconnectors up to 1600 A
Introduction
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Siemens LV 10 · 2014
■
Application
3VT switch disconnectors can be used as main control switches
for sub-distribution boards, repair and transfer switches for ca-
bles, busbars or unit combinations.
As three and four-pole versions, they ensure making and break-
ing of the specified rated current under load. At the same time,
they constitute a safety isolating function and isolating distance
in all low-voltage circuits.
The position of the operating toggle lever always matches that
of the contacts (positive operation).
All 3VT switch disconnectors meet the requirements of
IEC 60947-1 and IEC 60947-3.
■
Technical specifications
Rated current
I
n
A
160
250
630
1000
1600
Number of poles
3 and 4 3 and 4
3 and 4 3
3
Rated insulation voltage
U
i
V
690
Rated impulse withstand voltage
U
imp
kA
rms
/1s
2
3
7.5
15
20
Utilization category
• 690 V AC
AC-23A AC-23B
• 440 V DC
DC-22A DC-23B
Rated operational voltage
U
e
• 50/60 Hz AC
V
690
• DC
440 (3 conducting paths series-connected)
Rated short-time withstand current
I
cw
kA
rms
/1s
2
3
7.5
15
20
Rated impulse withstand voltage
U
imp
kV
8
Rated short-circuit making capacity
I
cm
/
U
e
• At 415 V AC
kA
2.8
4.26
12.5
30
40
• At 440 V DC
kA
2.8
4.26
12.5
30
40
Endurance
• Mechanical
Operating cycles 20 000
30 000
20 000
10 000
10 000
• Electrical
Operating cycles 6 000
3 000
5 000
4 000
4 000
Switching frequency
1/h
120
120
120
120
120
Power loss per pole
W
15
18
75
100
120
© Siemens AG 2014