Siemens SIMATIC NET SCALANCE XR-300WG Operating Instructions Manual page 44

Installation
5.4 DIN rail mounting / wall mounting
Figure 5-3
2. Screw the protruding ends of the DIN rail to the wall or other surface for attaching the DIN rail.
3. Connect the cables, see section "Connecting up (Page 49)"
44
Assembling PoE variants and standard mounting rail
Screwing in the DIN rail Screwing on the standard mounting rail for
PoE variants
Operating Instructions, 03/2021, C79000-G8976-C454-07
SCALANCE XR-300WG