The electronic ballast for T8 fluorescent lamps with an output of 18W or 36W were developed by order of the SBF Spezialleuchten GmbH for the application in railway vehicles. The ballast is inserted in a narrow aluminium housing. The line connection is made via terminal strips with push actuators. The electronic lamp ballast is open and short-circuit stable, and has a reverse polarity protection. The ballast fulfils both the EMV-standards EN50121-3-2 und EN55011.