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DIN EN IEC 61558-2-4 VDE 0570-2-4:2025-08

Safety of transformers, reactors, power supply units and combinations thereof

Part 2-4: Particular requirements and tests for isolating transformers and power supply units incorporating isolating transformers for general applications

(IEC 61558-2-4:2021); German version EN IEC 61558-2-4:2025
Class/Status: Standard, valid
Released: 2025-08
VDE Art. No.: 0500314

This part 2 of IEC 61558 applies to stationary and portable, single-phase and polyphase, aircooled (natural or forced) independent and associated separating transformers, having a rated supply voltage not exceeding 1 000 V a.c, a rated frequency not exceeding 500 Hz, and a rated output not exceeding: - 1 kVA for single-phase transformers; - 5 kVA for polyphase transformers. Transformers covered by this standard may only be used where double or reinforced insulation between circuits is not required by the installation rules or by the appliance specification.