Siemens SIRIUS 3RH Series, System Manual

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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 L 2
2 T 1
A 2 -
A 1 +
3 L 2 5 L 3
A 3 +
4 T 2 6 T 3
Figure 1-4 Two-phase switching through antiparallel thyristor pairs