SIEMENS
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Siemens IC 10 · 2017
Contactors for Special Applications
3TC contactors for switching DC voltage, 1-pole and 2-pole
4
Rated data of the auxiliary contacts,
see page 4/75
.
Rated data of the main contacts
Load rating with DC
Utilization category DC-1, switching resistive loads (
L/R
1 ms)
• Rated operational current
I
e
/DC-1 (at 55 °C)
A
500
• Minimum conductor cross-section
mm
2
2 x 150
• Rated power
(
750 V DC: one conducting path,
> 750 V DC: two conducting paths in series)
At 220 V
kW
110
440 V
kW
220
600 V
kW
300
750 V
kW
375
1 200 V
kW
--
600
1 500 V
kW
--
750
• Critical currents, without arc extinction
At 440 V
A
7
--
600 V
A
13
--
750 V
A
15
--
800 V
A
--
7
1 200 V
A
--
13
1 500 V
A
--
15
Utilization categories DC-3 and DC-5,
shunt-wound and series-wound motors (
L/R
15 ms)
• Rated operational current
I
e
(at 55 °C)
A
400
• Rated power at
U
e
(
220 V DC: one conducting path,
> 220 V DC: two conducting paths in series)
At 110 V
kW
35
220 V
kW
70
440 V
kW
140
600 V
kW
200
750 V
kW
250
1 200 V
kW
--
400
1 500 V
kW
--
500
Permissible rated current for
regenerative braking
at 110 ... 600 V
A
400
Switching frequency
Switching frequency
z
in operating cycles/hour
AC/DC operation
• With resistive load DC-1
h
-1
750
1 000
• For inductive load DC-3/DC-5
h
-1
500
Conductor cross-sections
Main conductors
(1 or 2 conductors can be connected)
Screw terminals
• Stranded with cable lug
mm
2
2 x ... 150
• Busbars
mm
2 x (30 x 4)
Auxiliary conductors
(1 or 2 conductors can be connected)
• Solid
mm
2
1 ... 2.5
• Finely stranded with end sleeve
mm
2
0.75 ... 1.5
Type
3TC74
3TC78
Design
1-pole contactors
2-pole contactors
© Siemens AG 2016