Siemens SIRIUS 3RV Series - Page 250

SIRIUS 3RT2 contactors/contactor assemblies
2.8 Technical data
SIRIUS Innovations
250 System Manual, 01/2011, A8E56203870002-03
Type 3RT20
23
3RT20
24
3RT20
25
3RT20
26
3RT20
27
3RT20
28
Size S0
Main circuit - Current carrying capacity for alternating current
Utilization category AC-5b, switching incandescent lamps
Per main current path at 230/220 V kW 2.8 3.2 4.7 6 7.2
Utilization category AC-6a, switching AC transformers
 Rated operational current I
e
- For inrush current n = 20 Up to 400 V A 11.4 20.2 30.8
- For inrush current n = 30 Up to 400 V A 7.6 13.5 20.5
 Rated operational power P
At 230 V kV/A 4.5 8 12.3
400 V kV/A 7.9 13.9 21.3
500 V kV/A 9.9 15.5 26.6
- For inrush current n = 20
690 V kV/A 13.6 15.5 25
At 230 V kV/A 3 5.4 8.2
400 V kV/A 5.2 9.3 14.2
500 V kV/A 6.6 11.7 17.7
- For inrush current n = 30
690 V kV/A 9.1 15.5 24.5
For deviating inrush current factors x, the power must be
recalculated as follows:
P
x
= P
n30
⋅ 30/x
Utilization category AC-6b, switching low-inductance (low-loss,
metallized-dielectric) AC capacitors
 Rated operational currents I
e
Up to 400 V A 5.8 10.8 15
At 230 V kvar 2.5 10.8 6
400 V kvar 4 4 10.4
500 V kvar 4 7.4 10.4
 Rated powers for single capacitors
or capacitor banks (minimum
inductance of 6 μH between
capacitors connected in parallel) at
50 Hz and 60 Hz
690 V kvar 4 7.5 10.4
1)
Industrial furnaces and electric heaters with resistance heating, etc. (increased power consumption on heating up taken
into account).
2)
Acc. to IEC 60947-4-1. See the chapter titled "Overload relays" for rated values for different starting conditions.
3)
For I
e
/AC-1 = 35 A (60 °C) and the corresponding minimum conductor cross-section 10 mm
2
.
4)
The number of lamps can be increased dependent upon the electronic ballast used.