Product Guide 2012 - Lantech Communications Global Inc

EN50155EN50155 series switchDifferent to the comfortable environment for passengers, the Ethernet devices in railway applicationsoften operate in a narrow and harsh environment with unique requirements. Devices in rail train must beable to suffer under wide range temperature and humidity. Furthermore, severe air pollution, vibration,shock and EMC are commonly seen. That’s why Industrial Switches are needed to be certified byEN50155 standard.The EN50155 standard is “ Railways Applications Electronic Equipment Used on Rolling Stock ”, which iscommonly adopted by many countries and electronics manufacturers. Electronic equipment shall bedesigned and manufactured to meet the full performance specification requirement for the selectedcategories such as:EN50155> Ambient temperatureAccording to diverse severe environments, there are four grades of operating temperaturerequirements defined by the EN50155 standard and are stated in the following table:ClassAmbienttemperatureoutside vehicleInternalcabinettemperatureInternal cubicleover -temperatureduring 10 minAir temperaturesurrounding the printedboard assemblyT1 -25°C to 40°C -25°C to 55°C 70°C -25°C to 70°CT2 -40°C to 35°C -40°C to 55°C 70°C -40°C to 70°CT3 -25°C to 45°C -25°C to 70°C 85°C -25°C to 85°CTX -40°C to 50°C -40°C to 70°C 85°C -40°C to 85°C> Shock and vibrationEN50155 adopts testing methods and limitation according to EN 61373 - Railway applications - Rollingstock equipment - Shock and vibration tests. The standard ensures the equipment to be able towithstand vibrations and shocks and provides the specified useful life under service conditions. Tosatisfy the requirements, the equipment should be specifically designed with anti-vibration mounts andinstalled the electronic units completely.> Relative humidityEN50155 defines the relative humidity standard that equipment should follow: The equipment shouldbe able to withstand 75 % of the average yearly relative humidity and 30 consecutive days with 95 %relative humidity in the year. IP67 enclosure is one of the best solutions, which provides rugged andwaterproof protection to against moisture environments that may cause any malfunction or failure.> Atmospheric pollutantsThe equipment may be exposed in different locations where various pollutants are available,including oil mist, salt spray, conductive dust, Sulphur dioxide. To ensure the durability, theequipment should have IP-rated enclosure to against the negative effects from these pollutants.P23