Siemens SIRIUS 3RT Series System Manual page 607

Wall mounting with DIN rail adapter
Wall mounting with DIN rail adapter is permissible for all device combinations. Size S0
reversing starters have to be mounted with DIN rail adapters.
The DIN rail adapters contain fastening holes for the screw mounting.
Note
2 x M4 screws (1.2 to 1.6 Nm) should be used to fasten the DIN rail adapters.
Disassembling the feeder from the DIN rail adapter
To disassemble the feeder, unscrew the screws and pull the feeder down to remove it.
Disassembling the DIN rail adapter from the wall
To disassemble the DIN rail, unscrew the screws and remove the adapter.
SIRIUS Innovations
System Manual, 01/2011, A8E56203870002-03
SIRIUS 3RA21/22 load feeders
6.6 Mounting
607