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3RT1/3RH1 contactors
SIRIUS System Manual
GWA 4NEB 430 0999-02b
3-31
Contact reliability
The high contact reliability of the auxiliary contacts ensures that false sig-
nals do not occur even at low switching capacities. With a voltage of 17 V
and a current of 1 mA, there is on average less than one contact fault per
100 million switching operations.
Overvoltage damping
Overvoltage damping protects sensitive output levels of electronic control-
lers against switching overvoltages of the coil.
Extended operating
range
The operating range of the coil of the contactor relays covers a voltage
range from 0.7 to 1.25 x U
s
(U
s
= rated control supply voltage). This wide
operating range is required for the supply voltage of electronic controllers
with the required voltage tolerances.
The supply voltage of electronic controllers with 24 VDC covers the range
20.4 V to 28.8 V in acc. with DIN 19 240. If you take into consideration an
additional loss of voltage of up to 3 V during the output phases, the contac-
tor drive must be able to operate perfectly with voltages between 17.4 V and
28.8 V. The 3RT10 and 3RH11 contactor relays for electronic controllers
operate safely from 17 V to 30 V, which corresponds to a voltage range of
0.7 x U
s
to 1.25 x Us. This is a considerably wider operating range than that
of 0.85 to 1.1 x U
s
for contactors and auxiliary contactors in acc. with
IEC 60 947, DIN EN 60 947 (VDE 0660).
Voltage ranges
The following graphic shows you the voltage ranges for electronic control-
lers and drives of contactors and contactor relays with a rated control supply
voltage of U
s
= 24 VDC:
Figure 3-13: Contactor relays: voltage ranges
Auxiliary switch blocks
Auxiliary switch blocks can be built on as follows:
Frame size S00: none
Frame size S0: a maximum of two 1-pole auxiliary switch blocks
Power consumption
Variant 1:
The power input of the magnet coils for contactor relays in frame
size S00 is 2.3 W at 24 VDC (operating range: 0.7 to 1.25 x U
S
).
Variant 2:
Contactor relays with reduced coil performance in frame size
S00, P = 1.4 W at 24 VDC (operating range: 0.85 to 1.85 U
S
).
The power input of magnet coils for contactor relays in frame size S0 is
4.2 W at 24 VDC (operating range: 0.7 to 1.25 x U
S
).
30
24
17
1.25
U
s
1.0
U
s
0.7
U
s
1.2 x
U
s
1.1 x
U
s
1.2 x
U
s
1.25 x
U
s
0.85 x
U
s
0.85 x
U
s
0.72 x
U
s
0.7 x
U
s
28.8 V
20.4 V
26.4 V
20.4 V
28.8 V
17.4 V
30 V
17 V
U
Voltage ranges for elec-
tronic controllers and
drives of contactors and
contactor relays with a
rated control supply vol-
tage of U
S
= 24 VDC
Supply voltage
range
Electronic control-
lers in acc. with
DIN 19240
Operating range of
contactors for elec-
tronic controllers
(contactor relays)
Operating range
for contactors in
acc. with
VDE 0660 part 102
Voltage range of
electronic outputs
at
≤
3 V internal
voltage drop