2015DIN EN 61869-4:2015 Instrument transformers - Part 4: Additional requirements for combined transformers (IEC 61869-4:2013); German version EN 61869-4:2014
2003DIN EN 60044-3:2003 Instrument transformers - Part 3: Combined transformers (IEC 60044-3:2002); German version EN 60044-3:2003