Siemens SIRIUS 3RH Series - Switching Technology

System overview
1.5 System properties
SIRIUS Innovations
30 System Manual, 01/2011, A8E56203870002-03
1.5.3 Switching technology
The SIRIUS modular system has the right technology for every application:
Table 1- 3 Motor starting options
Application Technology
 Direct-on-line start  3RT contactors, 3RA contactor
assemblies, or 3RA6 compact starters
 Reversing start  3RA reversing contactor assemblies
 3RA6 compact starters
Electromechanical
starting
 Star-delta (wye-delta) start  3RA contactor assemblies for star-delta
(wye-delta) start
 Direct-on-line start  3RF solid-state switching devices
 Reversing start  3RF solid-state switching devices
Electronic starting
 Soft start  3RW soft starters
Example: 3RT contactors, 3RA contactor assemblies, or 3RA6 compact starters
3RT contactors, 3RA contactor assemblies, or 3RA6 compact starters are used for all
standard applications up to 250 kW.
ϑ
ϑ
W
W
W
V
3
PD[
Figure 1-3 Direct switching through current feed of the contactor coil
Example: 3RF solid-state switching devices
3RF solid-state switching devices are used for frequent switching or reversing, of motors in
parcel distribution systems, for example.
1 L2
2 T1
A2 -
A1 +
3 L2 5 L3
A3 +
4 T2
6 T3
Figure 1-4 Two-phase switching through antiparallel thyristor pairs