This part of IEC 62848 applies to non-linear metal-oxide surge arresters without gaps for both on board and fixed installations@ designed to limit voltage surges on DC systems specified in IEC 60850 with nominal voltage up to 3 kV.
IEC 62848-1:2016 history
2016IEC 62848-1:2016 Railway applications - DC surge arresters and voltage limiting devices - Part 1: Metal-oxide surge arresters without gaps