Siemens SIRIUS 3RT Series System Manual page 157

Fitting of auxiliary switches on 3RT2 contactors (size S00 and S0)
1 Contactor size S00
2 Contactor size S0
3 Laterally mountable auxiliary switch block (right or left), 2-pole
4 Auxiliary switch block for snapping onto the front, 4-pole
5 Auxiliary switch block for snapping onto the front, 2-pole (cable entry from above)
6 Auxiliary switch block for snapping onto the front, 2-pole (cable entry from below)
7 Auxiliary switch block for snapping onto the front, 1-pole (cable entry from above or below)
8 Function module for AS-Interface, direct-on-line start
9 3RA28 function modules
10 Function module for IO-Link, direct-on-line start
Figure 2-22 Fitting of auxiliary switches on 3RT2 contactors (size S00 and S0)
SIRIUS Innovations
System Manual, 01/2011, A8E56203870002-03
SIRIUS 3RT2 contactors/contactor assemblies
2.7 Accessories
157