78 / 158
Switch Disconnectors
3KM Switch Disconnectors with Fuses and Isolating Plug Connector up to 400 A
Introduction
7/78
Siemens LV 10 · 2014
7
■
Technical specifications
1)
Configuring note: Max. permissible operating temperature for fuse blades
135 °C, for connections 100 °C.
2)
110 V (one conducting path).
3)
220 V DC (L1 and L3 series-connected) or 110 V DC
(one conducting path) at DC-23A.
4)
At 440 V
L/R
= 4 ms, at 220 V
L/R
= 1 ms.
5)
At 440 V DC-22A, at 220 V DC-23A.
6)
3ND1 switchgear protection fuse.
Standards
IEC 60947-1, IEC 60947-3, VDE 0660 Part 107
Type
3KM50
3KM52
3KM53
3KM55
3KM57
Rated uninterrupted current
I
u
A 63
125
160
250
400
For fuse links according to DIN 43620,
(when SITOR semiconductor fuses are used, a reduction of rated
current is necessary,
see reference to technical information at start of chapter
)
Size 00 and 000 00 and 000 00 and 000 1 and 2
1 and 2
Conventional free-air thermal current
I
th
1)
A 63
125
160
250
400
Rated insulation voltage
U
i
V 690
1000
1000
1000
1000
Rated impulse withstand voltage
U
imp
kV 6
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)
2)
Rated short-circuit making capacity with fuses
kA 220
220
220
176
176
(peak value, at 50/60 Hz 690 V AC)
Rated conditional short-circuit current with fuses
kA
100
100
100
80
80
At 50/60 Hz 690 V AC (rms value)
Max. rated current
I
n
of the fuses
A 80
160
160
400
400
Max. permissible power loss of the installed fuse
• NH
W 6
9
11.5
32
45
• BS
W 8 (A2/A3)
11.5 (A4)
11.5
32
45
Permissible let-through current of the fuses
kA 8
17
17
30
3)
30
3)
Maximum permissible let-through
I
2
t
value
kA
2
s 55
223
223
1000
1000
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
1000
1280
2000
3200
• Rated operational current
I
e
with AC-21A, AC-22A, AC-23A
A 63
125
160
250
400
• Motor switching capacity AC-23A
kW 30
65
80
132
200
At 500 V AC
• Breaking current
I
c
(at p.f. = 0.35, rms value)
A 500
1000
1280
2000
3200
• Rated operational current
I
e
with AC-21A, AC-22A, AC-23A
A 63
125
160
250
400
• Motor switching capacity AC-23A
kW 40
90
110
185
280
At 690 V AC
• Breaking current
I
c
(at p.f. = 0.35, rms value)
A 500
1000
1280
2000
3200
• Rated operational current
I
e
with AC-21A, AC-22A, AC-23A
A 63
125
160
250
400
• Motor switching capacity AC-23A
kW 50
110
150
220
375
At 440 V DC (3 conducting paths series-connected)
4)
• Breaking current
I
c
(
L/R
= 15 ms)
A 250
500
640
1000
4)
1600
• Rated operational current
I
e
at DC-23A
A 63
125
160
250
5)
400
Rated short-time current (1 s current),
rms value
kA
2.5
3.2
3.2
8
11
Permissible ambient temperature
°C -25 ... +55 for operation
6)
°C -50 ... +80 when stored
Mechanical endurance,
operating cycles
15000
15000
15000
12000
12000
Degree of protection
IP00/IP20 (from the operator side, with fuse and terminal covers)
Power loss of the switch disconnector at
I
th
W 8.5
22
36
33
86
(plus power loss of the fuses)
Main conductor connections
Busbar systems, max. dimensions (W
T)
mm
25
9
45
10
45
10
40
12
40
15
Cable lug, max. conductor cross-section (stranded)
mm
2
35
70
120
150
2
150 or
1
240
Busbar systems, max. dimensions (W
T)
mm
25
9
45
10
45
10
40
12
40
15
Tightening torque
Nm 6 ... 7.5
7 ... 10
18 ... 22
35 ... 45
35 ... 45
Terminal screws
M6
M6
M8
M10
M10
Protective conductor connections
Flat bars
mm --
--
--
20
2.5
20
2.5
Cable lug, max. conductor cross-section (stranded)
mm
2
--
--
--
70
120
© Siemens AG 2014