IEC 61558-2-16 deals with the safety of switch mode power supply units and transformers for switch mode power supply units. SMPS covered by IEC 61558-2-16 are air cooled (natural or forced) independent, associated, stationary, portable, single-phase or polyphase with the rated supply voltage not exceeding 1 000 V AC, the rated supply frequency not exceeding 500 Hz, the rated internal operating frequency exceeding 500 Hz, but not exceeding 100 MHz, and the rated output not exceeding 1 kVA or 1 kW, incorporating dry-type transformers with encapsulated or non-encapsulated windings.
IEC 61558-2-16 applies to SMPS, converters and inverters without limitation of the rated output, subject to an agreement between the purchaser and the manufacturer.
It applies to:
a) SMPS incorporating safety isolating transformers providing SELV, PELV, AC or DC output voltage(s) or a combination thereof by IEC 61140 and IEC 60364-4-41 for use with household and other consumer products,
b) SMPS with a maximum output voltage not exceeding 1 000 V AC or 1 415 V ripple-free DC for use with household and other consumer products, except for products covered in a),
c) This document can be used for transformers for use in SMPS (see Annex BB).
It can also be used for guidance for products not covered by the scope of this document. IEC 60086-4:2025 text has been approved in Europe as EN IEC 60086-4:2025 without any changes.
