Siemens LV 10 · 2004
7/12
SENTRIC Switch Disconnectors
General data
SENTRIC K Switch Disconnectors from 63 A to 1000 A
7
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Technical specifications
1)Technical specifications for CSA 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 for 3NA38, 3NA32 or 3ND18, 3ND12 fuses (105 kA/50 kA for others).
5)3ND1 switchgear protection fuses.
6)AC-23B.
7)At 440 V L/R = 4 ms, at 220 V L/R = 15 ms.
8)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 3KA531) 3KA55 3KA571) 3KA58
Rated uninterrupted current IuA63 80 125 160 250 400 6303)
Continuous thermal current Ith2) A63 80 125 160 250 400 6303)
Rated insulation voltage
U
iV 690 690 1000 1000 1000 1000 1000
Rated impulse withstand voltage
U
imp kV 6688888
Rated operating voltage
U
e
AC 50 Hz/60 Hz V 690
DC V 440 (3 conducting paths series-connected),
220 (2 conducting paths series-connected)
Rated short-circuit making capacity
with back-up fuses4)
at AC 50 Hz/60 Hz 690 V kA (peak value) 220 220 220 220 220 220 220
Rated conditional short-circuit current with series-
connected fuses4)
at AC 50 Hz/60 Hz 690 V kA (rms value) 100 100 100 100 80 80 50
Max. rated current In of the fuses A 63 80 160 160 400 400 630
Permissible let-through current of the fuses kA 810 17 17 305) 305) 405)
Maximum permissible let-through I2t value kA2s55 55 223 223 1000 1000 2600
Permissible let-through current of a series-con-
nected circuit-breaker
at AC 50 Hz/60 Hz 690 V kA (peak value) 78815 25 25 32
Rated short-circuit making capacity
without fuses
at AC 50 Hz/60 Hz 690 V kA (peak value) 7 7 7 9 20 25 35
Switching capacity (infeed top or bottom)
at AC 400 V
Breaking current Ic(p.f. = 0.35) A (rms value) 500 650 1000 1280 2000 3200 5040
Rated operating current Ieat
AC-21A, AC-22A, AC-23A A 63 80 125 160 250 400 6306)
Motor switching capacity at AC-23A kW 30 40 65 80 132 200 350
At AC 500 V
Breaking current Ic(p.f. = 0.35) A (rms value) 500 640 1000 1280 2000 3200 3200
Rated operating current Ieat
AC-21A, AC-22A
AC-23A A
A63
63 80
80 125 160
160 250
250 400
400 630
4006)
Motor switching capacity at AC-23A kW 40 50 90 110 185 280 280
at AC 690 V
Breaking current Ic(p.f. = 0.35) A (rms value) 500 500 1000 1280 2000 3200 3200
Rated operating current Ieat
AC-21A, AC-22A
AC-23A A
A63
63 80
63 125
125 160
160 250
250 400
400 630
4006)
Motor switching capacity at AC-23A kW 50 50 110 150 220 375 375
at DC 440 V (3 conducting paths connected in series)
Breaking current Ic(L/R = 15 ms) A250 260 500 640 10007) 1600 1600
Rated operating current Ieat DC-23A A 63 63 125 160 2508) 400 400
Rated short-time current (1 s current) kA (rms value) 2.5 2.5 3.2 3.2 811 15
Permissible load
depending on the ambient temperature for open-type
installation in switchboards (e.g. 8NA1) in switchgear
cubicles or switchgear racks at
35 °C A 63 80 125 160 250 400 630
40 °C A 63 80 125 160 250 400 620
45 °C A 63 80 125 160 250 400 600
50 °C A 63 80 125 160 250 400 580
55 °C A 63 80 125 160 250 400 560
60 °C A 63 80 125 160 250 400 550
Permissible ambient temperature °C –25 ... +55 for operation, –50 ... +80 for storage3)