This part of IEC 61558 deals with safety aspects of transformers, reactors, power supply
units and combinations thereof such as electrical, thermal and mechanical safety.
This document covers the following independent or associated stationary or portable types
of dry-type transformers, power supply units, including switch mode power supply units,
reactors and combinations thereof in the field of safety. The windings can be encapsulated or
non-encapsulated. They are not forming a part of the distribution network.