Siemens SIMATIC IFP Basic Series Operating Instructions Manual page 71

Symbol Meaning
Only for industrial applications and indoor areas (control cabinet)
Install in control cabinet only
Devices approved for Ex Zone 2 in a control cabinet with min. IP54
Devices approved for Ex Zone 22 in a control cabinet with min. IP6x
IFP Basic
Operating Instructions, 03/2019, A5E46178354 - AB
Markings and symbols
B.1 Safety-relevant symbols
Reference
71