Use in Hazardous Environments • 219WAGO-I/O-SYSTEM 750ETHERNET TCP/IP7.4.3 Temperature classesElectrical components for explosive areas are differentiated by temperatureclasses:Temperature classes Maximumsurface temperatureIgnition temperatureof the combustible materialsT1 450 °C > 450 °CT2 300 °C > 300 °C to 450 °CT2A 280 °C > 280 °C to 300 °CT2B 260 °C > 260 °C to 280 °CT2C 230 °C >230 °C to 260 °CT2D 215 °C >215 °C to 230 °CT3 200 °C >200 °C to 215 °CT3A 180 °C >180 °C to 200 °CT3B 165 °C >165 °C to 180 °CT3C 160 °C >160 °C to 165 °CT4 135 °C >135 °C to 160 °CT4A 120 °C >120 °C to 135 °CT5 100 °C >100 °C to 120 °CT6 85 °C > 85 °C to 100 °C
