EN 61558-2-12:2001 Safety of Power Transformers, Power Supply Units and Similar Devices Part 2-12: Particular Requirements for Constant Voltage Transformers (Remains Current)
2011EN 61558-2-12:2011 Safety of transformers@ reactors@ power supply units and combinations thereof - Part 2-12: Particular requirements and tests for constant voltage transformers and power supply units for constant voltage
2001EN 61558-2-12:2001 Safety of Power Transformers, Power Supply Units and Similar Devices Part 2-12: Particular Requirements for Constant Voltage Transformers (Remains Current)