Switching Technology - Siemens SIRIUS 3RT Series System Manual

System overview
1.5 System properties
1.5.3

Switching technology

The SIRIUS modular system has the right technology for every application:
Table 1- 3
Application
Electromechanical
starting
Electronic starting
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
Figure 1-3
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.
Figure 1-4
30
Motor starting options
Direct-on-line start

Reversing start

Star-delta (wye-delta) start

Direct-on-line start

Reversing start

Soft start

ϑ
Direct switching through current feed of the contactor coil
1 L2 3 L2 5 L3
2 T 1 4 T 2 6 T 3
Two-phase switching through antiparallel thyristor pairs
Technology
3RT contactors, 3RA contactor

assemblies, or 3RA6 compact starters
3RA reversing contactor assemblies

3RA6 compact starters

3RA contactor assemblies for star-delta

(wye-delta) start
3RF solid-state switching devices

3RF solid-state switching devices

3RW soft starters

A 1 +
A 2 -
A 3 +
System Manual, 01/2011, A8E56203870002-03
SIRIUS Innovations