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Switch Disconnectors
3KA, 3KE Switch Disconnectors up to 1000 A
Introduction
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Siemens LV 10 · 2014
■
Technical specifications
1)
Technical specifications for approval on request.
2)
Configuring note: Max. permissible operating temperature at connections
100 °C.
3)
With 3KA58 for operation -25 °C ... +35 °C, 570 A at 55 °C.
4)
Only available with 3NA38, 3NA32 or 3ND18, 3ND12 fuses
(otherwise only 105 kA/50 kA).
5)
3ND1 switchgear protection fuse.
6)
AC-23B.
7)
220 V DC (L1 and L3 series-connected) or 110 V DC
(one conducting path) at DC-23A.
8)
At 440 V
L/R
= 4 ms, at 220 V
L/R
= 15 ms.
9)
At 440 V DC-22A, at 220 V DC-23A.
Standards
IEC 60947-1, IEC 60947-3, VDE 0660 Part 107
Type
3KA50 3KA51 3KA52
1)
3KA53
1)
3KA55
1)
3KA57
1)
3KA58
1)
Rated uninterrupted current
I
u
A 63
80
125
160
250
400
630
3)
Conventional free-air thermal current
I
th
2)
A 63
80
125
160
250
400
630
3)
Rated insulation voltage
U
i
V 690
690
1000
1000
1000
1000
1000
Rated impulse withstand voltage
U
imp
kV 6
6
8
8
8
8
8
Rated operational voltage
U
e
50/60 Hz AC
V 690
DC
V 440 (3 conducting paths series-connected)
V 220 (2 conducting paths series-connected)
V 110 (1 conducting path)
Rated short-circuit making capacity
I
cm
with upstream fuses
4)
kA 220
220
220
220
176
176
105
At 50/60 Hz 690 V AC, peak value
Rated conditional short-circuit current
with upstream fuses
4)
kA
100
100
100
100
80
80
50
At 50/60 Hz 690 V AC, rms value
Max. rated current
I
n
of the fuses
A 63
80
160
160
400
400
630
Permissible let-through current of the fuses
kA 8
10
17
17
30
5)
30
5)
40
5)
Maximum permissible let-through
I
2
t
value
kA
2
s 55
55
223
223
1000
1000
2600
Permissible let-through current of an upstream circuit
breaker
kA
7
8
8
15
25
25
32
At 50/60 Hz 690 V AC, peak value
Rated short-circuit making capacity without fuses
kA 7
7
7
9
20
25
35
At AC 50 Hz/60 Hz 690 V, peak value
Breaking capacity
(infeed from the top or bottom)
At 400 V AC
• Breaking current
I
c
(at p.f. = 0.35, rms value)
A
500
650
1000
1280
2000
3200
5040
• Rated operational current
I
e
at
- AC-21A, AC-22A, AC-23A
A 63
80
125
160
250
400
630
6)
• Motor switching capacity AC-23A
kW 30
40
65
80
132
200
350
At 500 V AC
• Breaking current
I
c
(at p.f. = 0.35, rms value)
A
500
640
1000
1280
2000
3200
3200
• Rated operational current
I
e
at
- AC-21A, AC-22A
A 63
80
125
160
250
400
630
- AC-23A
A 63
80
125
160
250
400
400
• Motor switching capacity AC-23A
kW 40
50
90
110
185
280
280
At 690 V AC
• Breaking current
I
c
(at p.f. = 0.35, rms value)
A 500
500
1000
1280
2000
3200
3200
• Rated operational current
I
e
at
- AC-21A, AC-22A
A 63
80
125
160
250
400
630
- AC-23A
A 63
63
125
160
250
400
400
• Motor switching capacity AC-23A
kW 50
50
110
150
220
375
375
At 440 V DC (3 conducting paths series-connected)
7)
• Breaking current
I
c
(
L/R
= 15 ms)
A 250
260
500
640
1000
8)
1600
1600
• Rated operational current
I
e
at DC-23A
A 63
63
125
160
250
9)
400
400
Rated short-time current
I
cw
(1 s current, rms value)
kA
2.5
2.5
3.2
3.2
8
11
15
Permissible ambient temperature
°C -25 ... +55 for operation
3)
°C -50 ... +80 when stored
Mechanical endurance,
operating cycles
15 000 15 000 15000
15 000 12 000 12 000 12 000
Degree of protection
IP00/IP20 (from the operator side, with busbar and terminal covers)
Power loss of the switch disconnector at
I
th
W 7
12
22
22
33
72
170
Main conductor connections
Busbar systems, max. dimensions (W x T)
mm 25 x 9
25 x 9
45 x 10 45 x 10 40 x 12 40 x 12 40 x 15
Cable lug, max. conductor cross-section (stranded)
mm
2
35
35
70
120
150
2 x 150 or
1 x 240
2 x 240
Tightening torque
Nm 6 ... 7.5 6 ... 7.5 7 ... 10 18 ... 22 35 ... 45 35 ... 45 35 ... 45
Terminal screws
M6
M6
M6
M8
M10
M10
M10
Protective conductor connections
Flat bars
mm --
--
--
--
20 x 2.5 20 x 2.5 20 x 2.5
Cable lug, max. conductor cross-section (stranded)
mm
2
--
--
--
--
70
120
120
© Siemens AG 2014