scope:

Is applicable to power electronic convertors mounted on-board railway rolling-stock and intended for supplying: - traction circuits; - auxiliary circuits of power vehicles, coaches and trailers. The application of this standard extends as far as possible to all other traction vehicles, including trolleybusses, for example: - semiconductor device assemblies - integrated cooling systems - intermediate d.c. link components and if necessary incorporated filters - semiconductor drive units and related sensors - incorporated protection circuits. The following types of power sources are taken into consideration: - a.c. contact lines - d.c. contact lines - on-board supplies such as generators, batteries and other electric power sources. This standard excludes converters for the supply of the control electronics and drive units for power semiconductors described by the EN 50155. Electronic control equipment of traction converters and those sensors not related to semiconductor drive units are covered by EN 50155.