"Features & Benefitsclosed design (case), screw terminalssemi-enclosed, cooling by free air convectionultra compact and only 25mm highaccording to EN50155 and EN45545-2 railway standardwide input voltage range 4:1no minimum load requiredInput/output isolation 4000V DCProtection: short-circuit, overload, overvoltage, input polarity reversalBuilt-in constant current limiting circuit LED display for switching onfor bus, train, tram, underground railwaysuitable for harsh and very dusty environments with high vibrations and extreme temperatures"