SIEMENS
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Siemens IC 10 · 2017
Contactors for Special Applications
3TK20 miniature contactors for resistive loads (AC-1), 4-pole
4
1)
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.
Type
3TK20. .-0. . .
3TK20. .-3. . .,
3TK20. .-6. . .,
3TK20. .-7. . .
Size
00
Main circuit (continued)
Load rating with DC
Utilization category DC-1,
switching resistive load (
L/R
1 ms)
(contact endurance 0.1 x 10
6
operating cycles)
• Rated operational currents
I
e
(at 55 °C)
-
1 conducting path
Up to 24 V
A
16
60 V
A
6
110 V
A
2
220/240 V
A
1
-
2 conducting paths in series
Up to 24 V
A
16
60 V
A
16
110 V
A
6
220/240 V
A
2
-
3 conducting paths in series
Up to 24 V
A
16
60 V
A
16
110 V
A
16
220/240 V
A
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
6
60 V
A
3
110 V
A
0.5
220/240 V
A
0.1
-
2 conducting paths in series
Up to 24 V
A
10
60 V
A
5
110 V
A
2
220/240 V
A
0.5
-
3 conducting paths in series
Up to 24 V
A
16
60 V
A
16
110 V
A
16
220/240 V
A
2
Switching frequency
1)
Switching frequency
z
in operating cycles/hour
• Contactors without overload relays
No-load switching
frequency
h
-1
10 000
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
© Siemens AG 2016