SIRIUS 3RT2 contactors/contactor assemblies
2.4 Configuration
SIRIUS Innovations
System Manual, 01/2011, A8E56203870002-03
131
Technical background information
The operating range of the coil for coupling relays covers a voltage range of 0.7 to 1.25 x U
s
(U
s
= rated control supply voltage). This wide operating range has been used as a basis in
order to ensure that the supply voltage of the electronic controls stays within the required
voltage tolerances. According to DIN 19240, the supply voltage of electronic controls with
24 V DC covers a range of 20.4 V to 28.8 V. If you take an additional voltage drop of up to
3 V within the output stages into account, the contactor drive must function without errors at
voltages of between 17.4 V and 28.8 V. The 3RT20 and 3RH21 coupling relays for electronic
controls work reliably from 17 V to 30 V, which corresponds to a voltage range of
0.7 x U
s
to 1.25 x U
s
. Compared to the operating range of 0.85 to 1.1 x U
s
for contactors and
contactor relays according to IEC 60947, DIN EN 60947 (VDE 0660), this is a significantly
expanded operating range.
The illustration below shows the voltage ranges for electronic controls and mechanisms of
contactors and contactor relays with a rated control supply voltage U
s
= 24 V DC:


 
9
9
9











9
9
9



[8
V
[8
V
[8
V
[8
V
[8
V
8
V
8
V
8
V
[8
V
[8
V
[8
V
9
9
8
1 Supply voltage range for electronic controls according to DIN 19340
2 Operating range for contactors according to (VDE 0660 Part 102)
3 Voltage range for electronic outputs at ≤ 3 V internal voltage drop
4 Operating range of contactors for electronic controls
Figure 2-7 Coupling relays, voltage ranges
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