Siemens SCALANCE X-300 Series Operating Instructions Manual page 301

Personal injury and property damage can occur
The installation of expansions that are not approved for SIMATIC NET products or their target
systems may violate the requirements and regulations for safety and electromagnetic
compatibility.
Only use expansions that are approved for the system.
Note
The test was performed with a device and a connected communications partner that also meets
the requirements of the standards listed above.
When operating the device with a communications partner that does not comply with these
standards, adherence to the corresponding values cannot be guaranteed.
SCALANCE X-300
Operating Instructions, 11/2019, A5E01113043-24
WARNING
Certifications and approvals
11.9 Product group SFP
301