SIEMENS
4/75
Siemens IC 10 · 2017
Contactors for Special Applications
3TC contactors for switching DC voltage, 1-pole and 2-pole
4
■
Overview
3TC4 and 3TC5
IEC 60947-1, EN 60947-1,
IEC 60947-4-1, EN 60947-4-1,
IEC 60947-5-1, EN 60947-5-1 (auxiliary switches)
The contactors are finger-safe according to IEC 60529.
Terminal covers may have to be fitted onto the connecting bars,
depending on the configuration with other devices.
The DC motor ratings given in the tables are applicable to the
DC-3 and DC-5 utilization categories with two-pole switching
of the load or with the two conducting paths of the contactor
connected in series.
One contactor conducting path can switch full power up to
220 V. For voltages over 220 V, the two conducting paths are
to be switched in series;
see "Rated data of the main contacts",
page 4/77
.
Auxiliary contacts
The contactors are equipped with two lateral auxiliary switch
blocks each with 1
NO + 1 NC contact. On the contactors 3TC48
to 3TC56 with AC operation, a second auxiliary switch block can
be mounted on the right and left. On contactors with DC opera-
tion, expansion of the auxiliary contacts is not possible.
3TC7
IEC 60947-4-1, EN 60947-4-1
The contactors are suitable for use in any climate. They are
suitable for switching and controlling DC motors as well as all
other DC circuits.
The solenoid excitation is configured for a particularly large
operating range. It is between 0.7 or 0.8 and 1.2
U
s
.
3TC74 contactors can be used at up to 750 V/400 A and 50 Hz
in AC-1 operation.
For voltages over 750 V, the two conducting paths (3TC74: two
contactors) are to be switched in series;
see "Rated data of the
main contacts", page 4/79
.
■
Application
The contactors are suitable for switching and controlling
DC motors as well as all other DC circuits.
A version with an especially large actuating voltage is available
for operation in electrically driven vehicles and in switchgear
with a particularly large coil operating range
(see page 4/84)
.
■
Technical specifications
Type
3TC4 and 3TC7
3TC5
Rated data of the auxiliary contacts
Rated insulation voltage
U
i
(pollution degree 3)
V
690
Conventional thermal current
I
th
= rated operational current
I
e
/AC-12
A
10
10
AC load
Rated operational current
I
e
/AC-15/AC-14
• For rated operational voltage
U
e
24 V
A
10
10
110 V
A
10
10
125 V
A
10
10
220 V
A
6
6
230 V
A
5.6
5.6
380 V
A
4
4
400 V
A
3.6
3.6
500 V
A
2.5
2.5
660 V
A
2.5
2.5
690 V
A
--
--
DC load
Rated operational current
I
e
/DC-12
• For rated operational voltage
U
e
24 V
A
10
10
60 V
A
10
10
110 V
A
3.2
8
125 V
A
2.5
6
220 V
A
0.9
2
440 V
A
0.33
0.6
600 V
A
0.22
0.4
Rated operational current
I
e
/DC-13
• For rated operational voltage
U
e
24 V
A
10
10
48 V
A
5
5
110 V
A
1.14
2.4
125 V
A
0.98
2.1
220 V
A
0.48
1.1
440 V
A
0.13
0.32
600 V
A
0.07
0.21
Type
3TC44 to 3TC56
s
and
u
rated data of the auxiliary contacts
Rated voltage, max.
V AC
600
Switching capacity
A 600, P 600
© Siemens AG 2016