Siemens SIRIUS 3RF Series

SIRIUS 3RA28 function modules for mounting on 3RT2 contactors
7.4 Functions
SIRIUS Innovations
System Manual, 01/2011, A8E56203870002-03
651
7.4 Functions
7.4.1 Overvoltage protection
All function modules feature an integrated varistor which attenuates the contactor coil below.
7.4.2 Time-delayed switching of contactors
Solid-state timing relays with semiconductor output (3RA2811-.CW10 / 3RA2812-.DW10) 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.
7.4.2.1 Response delay
Contacts
Function modules are available with the following contacts:
3RA2811-.CW10: 1 semiconductor output (NO contact)
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.
NOTICE
Rated operational current, residual current in the case of non-switched output and voltage
drop in the case of switched output need to be taken into account.