36 Connect Devices WAGO-I/O-SYSTEM 750750-606 24 V DC 1.0 A power supply Ex iManualVersion 1.4.0 valid from HW version 03Figure 12: Overvoltage CategoriesTable 18: Legend for Figure “Overvoltage Categories”Pos.Explanation1 Fieldbus coupler/controller2 Filter module3 Ex i supply module4 Ex i I/O modules5 End moduleBoth overvoltage categories and rated surge voltage acc. to EN 60664-1:2007are listed in the appendix.