Siemens SCALANCE XR-300M Operating Instructions Manual page 40

Connecting
5.1 Safety when connecting up
Safety notices when using the device according to Hazardous Locations (HazLoc)
If you use the device under HazLoc conditions you must also keep to the following safety
notices in addition to the general safety notices for protection against explosion:
EXPLOSION HAZARD
DO NOT DISCONNECT WHILE CIRCUIT IS LIVE UNLESS AREA IS KNOWN TO BE
NON-HAZARDOUS.
Safety notices for use according to ATEX and IECEx
If you use the device under ATEX or IECEx conditions you must also keep to the following
safety notices in addition to the general safety notices for protection against explosion:
Take measures to prevent transient voltage surges of more than 40% of the rated voltage.
This is the case if you only operate devices with SELV (safety extra-low voltage).
Before connecting up and commissioning the device, read the information in the section
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WARNING
WARNING
WARNING
Compact Operating Instructions, 05/2016, A5E02661171-11
SCALANCE XR-300M