Din Rail Mounting Pluggable Relay 100,000,000 Mechanical operations minimum. 200,000 Electrical operations minimum. Operating Temperature : 0 to 50 degree Celsius. Storage Temperature: -10 to 60 degree Celsius. Relative Humidity : 5 to 85% RH. Relay ON Indication : Green color LED. Designation: Designation plate screwed to the PCB for Labeling purpose.