SIEMENS
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Siemens IC 10 · 2017
Power Contactors for Switching Motors
SIRIUS 3RT12 and 3TF6 vacuum contactors
3
1)
Industrial furnaces and electric heaters with resistance heating, etc.
(increased power consumption on heating up has been taken into
account).
2)
Max. permissible rated operational current
I
e
/AC-4 =
I
e
/AC-3 up to 500 V,
for reduced contact endurance and reduced switching frequency.
3)
Dependence of the switching frequency
z’
on
the operational current
I
’
and operational voltage
U
’:
z’
=
z
(
I
e
/
I
’
)
(
U
e
/
U
’)
1.5
1/h.
SIRIUS vacuum contactors
Vacuum contactors
Type
3RT1264
3RT1265
3RT1266
3RT1275
3RT1276
3TF68
3TF69
Size
S10
S12
14
Rated data of the main contacts
Load rating with AC
Utilization category AC-1
Switching resistive loads
• Rated operational currents
I
e
-
At 40 °C up to 690 V
330
610
700
910
-
At 40 °C up to 1 000 V
A
330
610
--
--
-
At 55 °C up to 690 V
A
--
--
630
850
-
At 55 °C up to 1 000 V
A
--
--
450
800
-
At 60 °C up to 1 000 V
A
300
550
--
--
• Rated power
for AC loads
1)
with p.f. = 0.95
At 60 °C
At 60 °C
At 55 °C
At 55 °C
-
At 230 V
kW
113
208
240
323
-
At 400 V
kW
197
362
415
558
-
At 500 V
kW
246
452
545
735
-
At 690 V
kW
340
624
720
970
-
At 1 000 V
kW
492
905
780
1 385
• Minimum conductor
cross-section for loads with
I
e
-
At 40 °C
mm
2
185
2 x 185
2 x 240
I
e
800 A:
2 x 60 x 5
(copper busbars)
-
At 55 °C
mm
2
--
--
2 x 185
I
e
< 800 A:
2 x 240
-
At 60 °C
mm
2
185
2 x 185
--
--
Utilization categories AC-2 and AC-3
• Rated operational currents
I
e
-
Up to 690 V
A
--
--
--
--
--
630
820
-
Up to 1 000 V
A
225
265
300
400
500
435
580
• Rated power
for slipring or squirrel-cage
motors at 50 and 60 Hz
-
At 230 V
kW
73
85
97
132
164
200
260
-
At 400 V
kW
128
151
171
231
291
347
450
-
At 500 V
kW
160
189
215
291
363
434
600
-
At 690 V
kW
223
265
288
400
507
600
800
-
At 1 000 V
kW
320
378
428
578
728
600
800
Thermal load capacity,
10 s current
A
1 800
2 120
2 400
3 200
4 000
5 040
7 000
Power loss per conducting path
at
I
e
/AC-3
W
9
12
14
21
32
45
70
Utilization category AC-4
(for
I
a
= 6 x
I
e
)
Maximum values:
• Rated operational current
I
e
-
Up to 690 V
A
195
230
280
350
430
610
690
• Rated power
of squirrel-cage motors
at 50 and 60 Hz
-
At 400 V
kW
110
132
160
200
250
355
400
The following applies to a contact endurance
of about 200 000 operating cycles:
• Rated operational currents
I
e
-
Up to 690 V
A
97
115
140
175
215
300
360
-
Up to 1 000 V
A
68
81
98
123
151
210
250
• Rated power
of squirrel-cage motors
at 50 and 60 Hz
-
At 230 V
kW
30
37
45
56
70
97
110
-
At 400 V
kW
55
65
79
98
122
168
191
-
At 500 V
kW
68
81
98
124
153
210
2)
250
2)
-
At 690 V
kW
94
112
138
172
212
278
2)
335
2)
-
At 1 000 V
kW
95
114
140
183
217
290
2)
350
2)
Switching frequency
Switching frequency
z
in operating cycles/hour
Contactors without overload relays
• No-load switching frequency
- AC
h
-1
2 000
2 000
1 000
- DC
h
-1
--
1 000
• Switching frequency
z
during
rated operation
3)
-
I
e
/AC-1 at 400 V
h
-1
800
750
700
-
I
e
/AC-2 at 400 V
h
-1
300
250
200
-
I
e
/AC-3 at 400 V
h
-1
750
500
-
I
e
/AC-4 at 400 V
h
-1
250
150
Contactors with overload relays
• Mean value
h
-1
60
15
© Siemens AG 2016