Siemens SIRIUS 3RT2 Manual page 28

Functions
5.2 Time-delayed switching of contactors
Function charts
3RA2811-.CW10
3RA2831-.DG10
3RA2831-.DH10
3RA2813-.AW10
3RA2813-.FW10
Method of operation
The set operating time t starts when the electronic timing relay (3RA2811) with
semiconductor output is connected to the supply voltage via A3 (timing relay) and A2
(contactor). Once the time has elapsed, the semiconductor switches through and controls
the contactor below.
The set operating time t starts when the electronic timing relay (3RA2831) with
semiconductor output is connected to the supply voltage via A3 and A4. Once the time has
elapsed, the semiconductor switches through and controls the contactor below.
The supply voltage is connected to the solid-state time-delay auxiliary switch (3RA2813) via
A1/A2 (contactor). The set operating time t starts when the supply voltage is connected. The
output relay switches once the time has elapsed.
28
SIRIUS 3RA28 function modules for mounting on 3RT2 contactors
Manual, 02/2019, A5E03656507620A/RS-AD/005