Siemens LV 10 · 2004
7/12
SENTRIC Switch Disconnectors
General data
SENTRIC K Switch Disconnectors from 63 A to 1000 A
7
■
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 3KA53
1)
3KA55 3KA57
1)
3KA58
Rated uninterrupted current I
u
A 63 80 125 160 250 400 630
3)
Continuous 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 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 fuses
4
)
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 fuses
4
)
at AC 50 Hz/60 Hz 690 V kA (rms value) 100 100 100 100 80 80 50
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 a series-con-
nected circuit-breaker
at AC 50 Hz/60 Hz 690 V kA (peak value) 7 8 8 15 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 I
c
(p.f. = 0.35)
A (rms value)
500 650 1000 1280 2000 3200 5040
Rated operating current I
e
at
AC-21A, AC-22A, AC-23A A
63 80 125 160 250 400 630
6)
Motor switching capacity at AC-23A kW 30 40 65 80 132 200 350
At AC 500 V
Breaking current I
c
(p.f. = 0.35)
A (rms value)
500 640 1000 1280 2000 3200 3200
Rated operating current I
e
at
AC-21A, AC-22A
AC-23A
A
A
63
63
80
80
125
160
160
250
250
400
400
630
400
6)
Motor switching capacity at AC-23A kW 40 50 90 110 185 280 280
at AC 690 V
Breaking current I
c
(p.f. = 0.35)
A (rms value)
500 500 1000 1280 2000 3200 3200
Rated operating current I
e
at
AC-21A, AC-22A
AC-23A
A
A
63
63
80
63
125
125
160
160
250
250
400
400
630
400
6)
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 I
c
(L/R = 15 ms)
A
250 260 500 640 1000
7)
1600 1600
Rated operating current I
e
at DC-23A A 63 63 125 160 250
8)
400 400
Rated short-time current (1 s current) kA (rms value)
2.5 2.5 3.2 3.2 8 11 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 storage
3)
(121 pages)
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