Siemens SIRIUS 3RF Series

SIRIUS 3RA28 function modules for mounting on 3RT2 contactors
7.2 Product description
SIRIUS Innovations
System Manual, 01/2011, A8E56203870002-03
645
7.2.2 Performance features
Features
The function modules have the following features:
Function module Features
Solid-state timing relays
with semiconductor
output
 ON-delay (1 NO contact)
 OFF-delay with auxiliary voltage (1 NO contact)
 Versions with screw-type and spring-loaded connection systems
Function modules
for direct-on-line
start
Solid-state time-delay
auxiliary switches
 ON-delay (1 NO contact + 1 NC contact or 1 CO contact)
 OFF-delay with/without auxiliary voltage (1 NO contact + 1 NC contact
or 1 CO contact)
 Versions with screw-type and spring-loaded connection systems
Function modules
for star-delta (wye-
delta) start
Star-delta (wye-delta)
start
 Control exclusively via contactor A1/A2 – no further control circuit
wiring required
 No control circuit wiring (plug-in system and connecting cables)
 Interchange proof construction
 Timing function for switching over from star to delta in basic module
 Electrical interlock without additional wiring
 Changeover delay time set to a non-adjustable value of 50 ms