DIN EN IEC 61558-2-23:2026-03

This part of IEC 61558 deals with the safety of transformers for construction sites and power supply units incorporating transformers for construction sites. Transformers incorporating electronic circuits are also covered by this document. This document is applicable to stationary or portable, single-phase or polyphase, air-cooled (natural or forced) independent or associated transformers, being isolating or safety isolating dry-type transformers for the use on construction sites. The windings can been capsulated or non-encapsulated. The rated supply voltage does not exceed 1000 V AC, and the rated supply frequency and the internal operating frequencies do not exceed 500 Hz. The rated output does not exceed: - 25 kVA for single-phase transformers; - 40 kVA for polyphase transformers. The standard differs from DIN EN 61558-2-23 (VDE 0570-2-23):2011-07 as follows: a) adjustment of structure and references in accordance with IEC 61558-1:2017; b) new symbol for power supply units with linearly regulated output voltage.