Power supply for 24 V, Permits vertical or horizontal mounting in Zone 2, Use three power supplies for redundancy, Galvanic isolation to mains, Voltage: 5.4 V DC +/- 5% ,12 V DC + 4/- 2%, Ambient temperature: -40 ... 60 °C (-40 ... 140 °F) , 70 °C (non-Ex)