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System overview

1.7 Components and combinations

SIRIUS Innovations

66 System Manual, 01/2011, A8E56203870002-03

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 3RA28 function modules for mounting on 3RT2 contactors

Area Customer benefits

Functions

 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

Dimensioning and

design

 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

Mounting

advantages

 Easy plug-on assembly of a starter, without tools

 Removable terminals

 Screw-type and spring-loaded terminals

Application

areas/customer

benefits

 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

Siemens SIRIUS 3RT2.1 Series System Manual

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