2006DIN EN 61558-1:2006 Safety of power transformers, power supplies, reactors and similar products - Part 1: General requirements and tests (IEC 61558-1:2005); German version EN 61558-1:2005
1998DIN EN 61558-1:1998 Safety of power transformers, power supply units and similar - Part 1: General requirements and tests (IEC 61558-1:1997, modified); German version EN 61558-1:1997
1969DIN VDE 0550-1:1969 Specifications for small transformers; Gerneral requirements