LED indicator Green: power indication Maximum current consumption (with 20mA signal) 51mA at 24V Power dissipation within unit (with 20mA signal) MTL5541-T 0.7W @ 24V dc MTL5541S-T 1.0W @ 24V dc Safety description Terminals 2 to 1 and 3: Uo=28V Io=93mA Po=651mW Um = 253V rms or dc Terminals 1 to 3: Simple apparatus ≤1.5V, ≤0.1A and ≤25mW; can be connected without further certification into any IS loop with an open-circuit voltage <28V Ambient temperature limits -20°C to + 65°C (-6 to + 149°F) operating -40°C to + 80°C (-40 to + 176°F) storage