Siemens SIRIUS 3RH Series, System Manual

Page: 117 / 786

SIRIUS 3RT2 contactors/contactor assemblies
2.4 Configuration
SIRIUS Innovations
System Manual, 01/2011, A8E56203870002-03
117
Application area Description and suitable contactor versions
Contactor assemblies
Operation of a motor in
two directions of
rotation
(3RA23 reversing
contactor assembly)
Contactor assembly for operation of a three-phase motor in two directions of rotation.
 3RA23 reversing contactor assemblies
Starting three-phase
motors with reduced
starting current peaks
(3RA24 contactor
assembly for star-delta
(wye-delta) start)
Contactor assembly for reducing the starting current and starting torque when starting three-
phase motors.
 3RA24 contactor assemblies for star-delta (wye-delta) start
2.4.2 Drive system/Coil selection
The 3RT2 power contactors and 3RH2 contactor relays can be supplied with drives for all
standard AC and DC coil voltages. In addition, 3RT2 power contactors of size S0 are
available with electronic UC drives, which feature an extended operating range (helping to
reduce variance) and have lower closing and holding powers, which enable less power to be
consumed in the control cabinet. The UC drive can be operated with either AC or DC
voltage. This is facilitated by control electronics with an upstream DC drive.
AC and DC drives Electronic drive (UC drive)
Control voltage AC control or DC control UC control
Operating range 0.8 to 1.1 x U
S1)
0.7 to 1.3 x U
S
Coil surge
suppressor
Optional (integrated in coupling relays) Integrated
Preferred
voltages

24 V
 110 V
 220/230 V

21 to 28 V
 95 to 130 V
 200 to 280 V
2)
Reduced variance  30 versions for AC control

15 versions for DC control
3 versions for the entire AC/DC range
Coil power
3)
:

Switch-on

Holding
AC coil

65 VA

8.5 VA
DC coil

5.9 W

5.9 W
AC mode

6.5 VA

1.26 VA
DC mode

6.7 W

0.8 W
1)
For further details, refer to the chapter titled "Technical data".
2)
At 280 V: high limit = 1.1 x U
S
.
3) Example: contactor (size S0), 7.5 kW, 24 V.