Installation   
5.2 Installing a switch 
  SCALANCE X-300 
112  Operating Instructions, 02/2012, A5E01113043-12 
19" rack mounting with standard orientation 
 
19" rack mounting 
1.  Select the required rack device (R) and the 19" cabinet.   
2.  Fix the two mounting brackets with 4 screws each to the 
sides of the housing. The maximum tightening torque for 
these screws is 0.5 Nm. 
 
  CAUTION: If you install a rack device (R) with 
components inserted. 
The locking mechanisms of components installed in the 
rack device (R) (for example the handles of media 
modules or the clips on the SFP) must be closed. 
See also installation of modular devices: 
- Installing media modules in a slot 
- Installing an SFP in an SFP media module. 
 
3.  Insert the rack device (R) in the 19" cabinet and hold the 
rack device (R) at the required height. Make sure that 
nothing is obstructing air from entering the ventilation 
grilles. 
Fit the securing screws to the two mounting brackets to 
secure the rack device (R) in the 19" cabinet. 
 
4.  Connect the grounding bolts. On the SCALANCE X-
300EEC, the PE connector is on the bottom of the 
device. On the SCALANCE XR-300M EEC, the PE 
connector is on the rear of the device between the 
power connectors. 
 
5.  Fit the connectors for the power supply. 
Note that the SCALANCE X-300 is available for different 
power supplies (100 to 240 VAC and 24 VDC variants). 
 
6.  Fit the remaining connectors, for example the signaling 
contact. 
 
 
Example of individual installation 
 
 
Note 
Individual inst
allation of the SCALANCE XR-300M 
Devices of the XR-300M category can also be installed upright in a cabinet door. In this 
case, the LED display is at the front and the cable outlet at the back of the cabinet door. 
Make sure that the mounting bracket is correctly positioned on the rack device (R) so that 
the rack device (R) can be mounted securely on the cabinet door.