Electronic equipment on rail vehicles must take into account the operating conditions on trains. The “railroad suitability” of electronic equipment is regulated by the European standard EN 50155. Although EN 50155 has an international counterpart – IEC 60571 – EN 50155 is the more common and globally recognized railroad standard. Requirements addressed by the standard include operating voltage, EMC, temperature, humidity, shock and vibration.
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The EN 50155 Standard at a Glance
The standard describes:
- Operating conditions with regard to operation, EMC, environment
- Technical characteristics such as components and structure
- Service life, maintainability, reliability
- Documentation and tests
Requirements and specifications include:
- Ambient temperature
- Relative humidity
- Vibration and shock
- Fluctuations or interruption of the power supply
- Type and routine tests
What Does the EN 50155 Standard Describe?
From design, construction and testing to operation, all electronic equipment used in railroad vehicles for control, regulation, power supply, diagnostics and protection is subject to the EN 50155 standard, which also describes the basic hardware and software requirements for high-performance and reliable equipment.
Electronic equipment includes all equipment that consists mainly of semiconductor devices and their associated components. This also includes sensors, assembled printed circuit boards and power electronics.
What are the Benefits of the EN 50155 Standard for Functionality of Electronics?
To ensure the functionality of electronics on a train, the test specifications of the EN 50155 standard intervene. The defined requirements must be met under the required environmental conditions. These include shocks, vibrations, salt, fog and the like. Fluctuations in the supply voltages are also covered by the standard. These range from 0.6 times to 1.4 times the nominal voltage.
EN 50155 refers to further test methods and standards and classifies their results. Requirements regarding electromagnetic compatibility (EMC) are defined by the EN 50121 standard, while the EN 45545 standard regulates fire safety requirements in rail vehicles.
What Role Does the EN 50155 Standard Play for Ethernet Switches in Public Transport?
Like other electronic devices used in rail vehicles, Ethernet switches are subject to the internationally recognized EN 50155 standard, which means they are tested with regard to EMC, fire protection requirements, environmental conditions, and more. A declaration of conformity by the manufacturer and a technical test report from an accredited laboratory certify compliance with the standard requirements.
ROQSTAR Gigabit Switches have both E1 certification and EN 50155 and are therefore ideally suited for installation in rail vehicles. They have been tested under harsh conditions to confirm their performance and reliability. EN 50155 certified ROQSTAR Gigabit Switches can withstand strong vibrations, shock and extreme temperatures. To protect the printed circuit boards, all PCBs in the ROQSTAR switches are painted (“conformal coating”).
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Our products are fundamental for the digitalization in public transport. ROQSTAR M12 Ethernet Switches provide the network infrastructure for e-ticketing, passenger counting systems (PCS), dynamic passenger information (DPI) and closed-circuit television (CCTV).