Siemens SIRIUS 3RT Series System Manual page 659

3RA2816-0EW20
The 3RA2816 function module for star-delta (wye-delta) start has the following features:
● The voltage is supplied through the plug-in contacts directly via the contactor's coil
terminals, parallel to A1/A2.
● The start time in star operation is activated by switching on the contactor.
● The changeover delay is 50 ms (this is a non-adjustable value).
● A varistor is integrated in the basic module to attenuate contactor coil switching
overvoltages.
SIRIUS Innovations
System Manual, 01/2011, A8E56203870002-03
SIRIUS 3RA28 function modules for mounting on 3RT2 contactors
s
%
7.5 Configuration
659