WAGO 750-306 Technical Description page 141

6.3.3 Unit Categories
Moreover, the areas of use (zones) and the conditions of use (explosion
groups) are subdivided into categories for the electrical operating means:
Unit
Categories
M1
M2
1G
2G
3G
1D
2D
3D
WAGO-I/O-SYSTEM 750
DeviceNet
Explosion Area of Use
Group
I Fire-damp protection
I Fire-damp protection
II Zone 0 Explosive environment by gas, fumes or mist
II Zone 1 Explosive environment by gas, fumes or mist
II Zone 2 Explosive environment by gas, fumes or mist
II Zone 20 Explosive environment by dust
II Zone 21 Explosive environment by dust
II Zone 22 Explosive environment by dust
Application in Explosive Environments • 141
Classification Meeting CENELEC and IEC