Siemens SIRIUS 3RT2 - 5 Functions; Overvoltage Protection; Time-Delayed Switching of Contactors; Response Delay

SIRIUS 3RA28 function modules for mounting on 3RT2 contactors
Manual, 02/2019, A5E03656507620A/RS-AD/005
27
Functions
5
5.1 Overvoltage protection
All function modules feature an integrated varistor which attenuates the contactor coil below.
5.2 Time-delayed switching of contactors
Electronic timing relays with semiconductor output (3RA2811-.CW10 / 3RA2812-.DW10 /
3RA2831-.D.10 / 3RA2832-.D.10) or solid-state time-delay auxiliary switches (3RA2813-
...W10 / 3RA2814-...W10 / 3RA2815-...W10) are used for the time-delayed switching of
contactors. The wide voltage range and the selectable time ranges ensure the advanced use
of the function modules.
5.2.1 Response delay
Contacts
Function modules are available with the following contacts:
Time-delayed switching of
contactors
3RA2811-.CW10 1 semiconductor output (NO
contact)
3RA2831-.DG10 1 semiconductor output (NO
contact)
3RA2831-.DH10 1 semiconductor output (NO
contact)
Time-delayed switching of
auxiliary contacts
3RA2813-.AW10
1 CO contact
3RA2813-.FW10
1 NC contact and 1 NO contact
Time ranges
The function modules support time-delayed switching from 0.05 to 100 s.
Note
Rated operational current, residual current in the case of a non
-
switched output, and voltage
drop in the case of a switched output must be taken into account.