SIEMENS
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Siemens IC 10 · 2017
Power Contactors for Switching Motors
3TF2 miniature contactors, 3-pole
3
Contactor
Type
3TF28,
3TF29
3TF20. .-0. . .,
3TF22. .-0. . .
3TF20. .-3. . .,
3TF20. .-6. . .,
3TF20. .-7. . .
Size
00
Rated data of main contacts (continued)
Load rating with DC
Utilization category DC-1,
switching resistive loads (
L/R
1 ms)
• Rated operational currents
I
e
(at 55 °C)
-
1 conducting path
Up to 24 V
A
10
16
60 V
A
4
6
110 V
A
1.5
2
220/240 V
A
0.6
1
-
2 conducting paths in series
Up to 24 V
A
10
16
60 V
A
10
16
110 V
A
4
6
220/240 V
A
1.5
2
-
3 conducting paths in series
Up to 24 V
A
10
16
60 V
A
10
16
110 V
A
10
16
220/240 V
A
4
6
Utilization category DC-3/DC-5,
shunt-wound and series-wound motors (
L/R
15 ms)
• Rated operational currents
I
e
(at 55 °C)
-
1 conducting path
Up to 24 V
A
4
6
60 V
A
1.8
3
110 V
A
0.3
0.5
220/240 V
A
--
0.1
-
2 conducting paths in series
Up to 24 V
A
6
10
60 V
A
3
5
110 V
A
1.5
2
220/240 V
A
0.3
0.5
-
3 conducting paths in series
Up to 24 V
A
10
16
60 V
A
10
16
110 V
A
10
16
220/240 V
A
1.5
2
Switching frequency
Switching frequency
z
in operating cycles/hour
• Contactors without overload relays for rated operation
No-load switching
frequency
h
-1
10 000
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
AC-1
h
-1
1 000
AC-2
h
-1
500
AC-3
h
-1
1 000
• Contactors with overload relays (mean value)
h
-1
15
Conductor cross-sections
Main and auxiliary conductors
(1 or 2 conductors can be connected)
Screw terminals
• Solid
mm
2
2 x (0.5 ... 2.5), 1 x 4
• AWG cables, solid
AWG
2 x (20 ... 14), 1 x 12
• Finely stranded with end sleeve
mm
2
2 x (0.5 ... 1.5), 1 x 2.5
• Pin-end connector (DIN 46231)
mm
2
1 x 1 ... 2.5
• Terminal screw
M3
• Prescribed tightening torque for terminal screws
Nm
0.8 ... 1.3
lb.in
7 ... 11
Main and auxiliary conductors
(1 or 2 conductors can be connected)
Flat connectors
• When using a plug-in sleeve 6.3 – 1
mm
2
0.5 ... 1
• Solid with 6.3–2.5
mm
2
1 ... 2.5
Solder pin connection
(only for printed circuit boards)
• Solder pin cross-section
mm
2
0.8 x 1.2
• Solder pin cross-section, plug-in base
mm
2
0.32 x 1.0
© Siemens AG 2016