Siemens SITOP Manual page 34

Mounting/removal
Use in hazardous zones
If the device is installed in a hazardous zone (II 3G Ex nA nC IIC T4 Gc (-2BA11, -2BA21, -
2BA51) / II 3G Ex nA IIC T4 Gc (-2BA31, -2BA41, -2BA61)), then it must be installed in a
distribution box with degree of protection IP54 or higher.
34
WARNING
Selectivity modules
Manual, 01.2017, C98130-A7579-A1-2-7629