DIN EN 61558-2-26:2014-05

The series of International Standards of IEC 61558 deals with safety requirements for transformers, reactors and certain types of power supply units. Part 1 of this series describes requirements and tests, applicable to most types of transformers. They are supplemented by the detail specifications of the Parts 2 of the series of standards. This Part 2-26 of IEC 61558 deals with safety aspects of transformers, power supply units and switch mode power supply units all for saving energy and other purposes in electrical installations by adjusting the output voltage and/or other electrical characteristics on the output circuits without interruption affected by the transformers, power supply units and switch mode power supply units. The saving of energy is obtained by voltage stabilization and/or voltage adjusting of the electrical installation. This standard may also be used for power supply units and switch mode power supply units intended to be used where adjusting of the voltage or other electrical characteristics is required by the final application. IEC 61558-2-26 applies to single-phase or three-phase transformers, power supply units and switch mode power supply units all for saving energy which are air-cooled, independent or incorporated and containing transformers and/or power supply units from the parts of the IEC 61558 series of standards 2-1, 2-4, 2-6, 2-13, 2-14 and 2-16. The rated supply voltage shall not exceed 1 000 V alternating voltage, and the rated supply frequency shall not exceed 500 Hz. This standard is applicable to linear power supply units with internal operational frequency not exceeding 500 Hz and in combination with part 2-16 also to switch mode power supply units and transformers all for saving energy with internal operating frequency higher than 500 Hz. The responsible body is DKE/K 323 "Transformatoren, Drosseln, Netzgeräte und entsprechende Kombinationen" ("Transformers, reactors, power supply units and combinations thereof") of the DKE (German Commission for Electrical, Electronic and Information Technologies) at DIN and VDE.