Sirius 3Ra28 Function Modules For Mounting On Sirius 3Rt2 Contactors - Siemens SIRIUS 3RT Series System Manual

System overview
1.7 Components and combinations
1.7.5.1

SIRIUS 3RA28 function modules for mounting on SIRIUS 3RT2 contactors

3RA28 function modules for mounting on 3RT2 contactors
SIRIUS 3RA28 function modules for mounting on SIRIUS 3RT2 contactors enable the
control circuit wiring to be reduced significantly. With star-delta (wye-delta) starters, for
example, they replace the control circuit wiring in its entirety.
Table 1- 18
Area
Functions
Dimensioning and
design
Mounting
advantages
Application
areas/customer
benefits
66
3RA28 function modules for mounting on 3RT2 contactors
Customer benefits
Direct-on-line, reversing, and star-delta (wye-delta) start

Time-delayed switching of contactors (0.05 to 100 s)

ON-delay and OFF-delay versions

Star-delta (wye-delta) function module without extra control circuit wiring

Switch position indication for the contactor via a mechanical plunger

Only one version for S00 and S0

Suitable for control voltages of 24 to 240 V AC/DC

Contactor coil controlled via semiconductor output

Star-delta (wye-delta) switchover 0.5 to 60 s

Star-delta (wye-delta) changeover delay: 50 ms

Easy plug-on assembly of a starter, without tools

Removable terminals

Screw-type and spring-loaded terminals

Assembly of star-delta (wye-delta) starters, including timing function and

electrical interlock, without additional wiring
Universal applicability thanks to wide voltage and time ranges

SIRIUS Innovations
System Manual, 01/2011, A8E56203870002-03