Name: SIST EN IEC 61558-1:2019/AC:2026
Brand: SIST
SKU: ca7fc6d3-c984-48f5-93f6-023febde6347

Safety of transformers, reactors, power supply units and combinations thereof - Part 1: General requirements and tests

Sicherheit von Transformatoren, Netzgeräten, Drosseln und entsprechenden Kombinationen - Teil 1: Allgemeine Anforderungen und Prüfungen

Sécurité des transformateurs, bobines d'inductance, blocs d'alimentation et des combinaisons de ces éléments - Partie 1: Exigences générales et essais

Varnost transformatorjev, reaktorjev, napajalnikov in kombinacij teh elementov - 1. del: Splošne zahteve in preskusi - Popravek AC

General Information

Status: Published
Publication Date: 04-Feb-2026

ICS: 29.180 - Transformers. Reactors

Technical Committee: I96 - Imaginarni 96

Current Stage: 6060 - National Implementation/Publication (Adopted Project)
Start Date: 14-Jan-2026
Due Date: 21-Mar-2026
Completion Date: 05-Feb-2026

Directive: 2014/35/EU - Directive 2014/35/EU of the European Parliament and of the Council of 26 February 2014 on the harmonisation of the laws of the Member States relating to the making available on the market of electrical equipment designed for use within certain voltage limits

Mandate: M/511 - Mandate to CEN, CENELEC and ETSI relating to harmonised standards in the field of the Low Voltage Directive

Ref Project: EN IEC 61558-1:2019/AC:2026-01 - Safety of transformers, reactors, power supply units and combinations thereof - Part 1: General requirements and tests

Relations

Corrects: SIST EN IEC 61558-1:2019 - Safety of transformers, reactors, power supply units and combinations thereof - Part 1: General requirements and tests
Effective Date: 01-Mar-2026

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Corrigendum

SIST EN IEC 61558-1:2019/AC:2026

English language

4 pages

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Frequently Asked Questions

What is SIST EN IEC 61558-1:2019/AC:2026?

SIST EN IEC 61558-1:2019/AC:2026 is a corrigendum published by the Slovenian Institute for Standardization (SIST). Its full title is "Safety of transformers, reactors, power supply units and combinations thereof - Part 1: General requirements and tests". This standard covers: Safety of transformers, reactors, power supply units and combinations thereof - Part 1: General requirements and tests

What is the scope of SIST EN IEC 61558-1:2019/AC:2026?

Safety of transformers, reactors, power supply units and combinations thereof - Part 1: General requirements and tests

What ICS categories does SIST EN IEC 61558-1:2019/AC:2026 belong to?

SIST EN IEC 61558-1:2019/AC:2026 is classified under the following ICS (International Classification for Standards) categories: 29.180 - Transformers. Reactors. The ICS classification helps identify the subject area and facilitates finding related standards.

What standards are related to SIST EN IEC 61558-1:2019/AC:2026?

SIST EN IEC 61558-1:2019/AC:2026 has the following relationships with other standards: It is inter standard links to SIST EN IEC 61558-1:2019. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.

Is SIST EN IEC 61558-1:2019/AC:2026 a harmonized European standard?

SIST EN IEC 61558-1:2019/AC:2026 is associated with the following European legislation: EU Directives/Regulations: 2014/35/EU; Standardization Mandates: M/511. When a standard is cited in the Official Journal of the European Union, products manufactured in conformity with it benefit from a presumption of conformity with the essential requirements of the corresponding EU directive or regulation.

How can I access SIST EN IEC 61558-1:2019/AC:2026?

SIST EN IEC 61558-1:2019/AC:2026 is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.

Standards Content (Sample)

SIST EN IEC 61558-1:2019/AC:20...

SLOVENSKI STANDARD
01-marec-2026
Varnost transformatorjev, reaktorjev, napajalnikov in kombinacij teh elementov - 1.
del: Splošne zahteve in preskusi - Popravek AC
Safety of transformers, reactors, power supply units and combinations thereof - Part 1:
General requirements and tests
Sicherheit von Transformatoren, Netzgeräten, Drosseln und entsprechenden
Kombinationen - Teil 1: Allgemeine Anforderungen und Prüfungen
Sécurité des transformateurs, bobines d'inductance, blocs d'alimentation et des
combinaisons de ces éléments - Partie 1: Exigences générales et essais
Ta slovenski standard je istoveten z: EN IEC 61558-1:2019/AC:2026-01
ICS:
29.180 Transformatorji. Dušilke Transformers. Reactors
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD EN IEC 61558-
1:2019/AC:2026-01
NORME EUROPÉENNE
EUROPÄISCHE NORM
January 2026
ICS 29.180
English Version
Safety of transformers, reactors, power supply units and
combinations thereof - Part 1: General requirements and tests
(IEC 61558-1:2017/COR1:2025)
Sécurité des transformateurs, bobines d'inductance, blocs Sicherheit von Transformatoren, Netzgeräten, Drosseln und
d'alimentation et des combinaisons de ces éléments - entsprechenden Kombinationen - Teil 1: Allgemeine
Partie 1: Exigences générales et essais Anforderungen und Prüfungen
(IEC 61558-1:2017/COR1:2025) (IEC 61558-1:2017/COR1:2025)
This corrigendum becomes effective on 9 January 2026 for incorporation in the English language version of the EN.

European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2026 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN IEC 61558-1:2019/AC:2026-01 E

Endorsement notice
The text of the corrigendum IEC 61558-1:2017/COR1:2025 was approved by CENELEC as EN IEC 61558-1:2019/AC:2026-01 without any
modification.
SIST
...

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SIST

SIST EN IEC 61558-2-14:2025(Main)

Safety of transformers, reactors, power supply units and combinations thereof - Part 2-14: Particular requirements and tests for variable transformers and power supply units incorporating variable transformers for general applications

EN IEC 61558-2-14:2025

This part of IEC 61558 deals with the safety of variable transformers for general applications and power supply units incorporating variable transformers for general applications.
Variable transformers incorporating electronic circuits are also covered by this document.
NOTE 1 Safety includes electrical, thermal, mechanical and chemical aspects.
Unless otherwise specified, from here onward, the term transformer covers variable transformers for general applications and power supply units incorporating variable transformers for general applications.
For power supply units (linear) this document is applicable. For switch mode power supply units, IEC 61558-2-16 is applicable together with this document. Where two requirements are in conflict, the most severe take precedence.
This document does not apply to transformers covered by IEC 60076-11.
This document is applicable to stationary or portable, single-phase or polyphase, air-cooled (natural or forced) independent or associated variable dry-type transformers.
- variable auto-transformers;
- variable separating transformers;
- variable isolating transformers;
- variable safety isolating transformers.
The windings can be encapsulated or non-encapsulated.
The rated supply voltage does not exceed 1 000 V AC and the rated supply frequency and the internal operational frequencies do not exceed 500 Hz.
The rated output does not exceed:
- 40 kVA for single-phase variable auto-transformers;
- 200 kVA for poly-phase variable auto-transformers;
- 1 kVA for single-phase variable separating transformers;
- 5 kVA for poly-phase variable separating transformers;
- 25 kVA for single-phase variable isolating transformers;
- 40 kVA for poly-phase variable isolating transformers;
- 10 kVA for single-phase variable safety isolating transformers;
- 16 kVA for poly-phase variable safety isolating transformers.
This document is applicable to variable transformers without limitation of the rated output subject to an agreement between the purchaser and the manufacturer.
NOTE 2 Transformers intended to supply distribution networks are not included in the scope.
[...]

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SIST EN IEC 61558-2-16:2025(Main)

Safety of transformers, reactors, power supply units and combinations thereof - Part 2-16: Particular requirements and tests for switch mode power supply units and transformers for switch mode power supply units for general applications

EN IEC 61558-2-16:2025

This part of IEC 61558 deals with the safety of switch mode power supply units and transformers for switch mode power supply units.
NOTE 1 Safety includes electrical, thermal and mechanical aspects.
Unless otherwise specified, from here onward, the term SMPS covers switch mode power supply units for general applications.
SMPS covered by this document 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.
NOTE 2 As the maximum rated supply voltage of the internal transformer is 1 000 V AC, the maximum rated supply voltage of the switch mode power supply unit can be lower due to the type of rectification.
NOTE 3 For higher frequencies, additional requirements can be necessary. However, this document can be used for guidance.
This document is applicable to SMPS, converters and inverters without limitation of the rated output subject to an agreement between the purchaser and the manufacturer.
NOTE 4 In the context of this document, converters and inverters are considered to be SMPS.
This document applies to:
a) SMPS incorporating safety isolating transformers providing SELV, PELV, AC or DC output voltage(s) or a combination thereof in accordance with 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).
This document does not apply to:
- motor-generator sets;
- uninterruptible power supplies (UPS) in accordance with the IEC 62040 series;
- SMPS covered by IEC 61204-7 (i.e. low-voltage power supply devices DC output, performance characteristics) and DC power and distribution equipment and SMPS for use in applications covered by IEC 61010-1 and IEC 60601-1;
- lamp control gear covered by the IEC 61347 series;
- external circuits and their components intended to be connected to the input terminals and output terminals of the SMPS;
- equipment in accordance with IEC 60065, IEC 60950-1 and IEC 62368-1.
This document can also be used for guidance for products not covered by the scope of this document, the scope of IEC 61204-7 or the scope of the IEC 61347 series.
This document covers the safety requirements for:
[...]

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SIST EN IEC 61558-2-20:2025(Main)

Safety of transformers, reactors, power supply units and combinations thereof - Part 2-20: Particular requirements and tests for small reactors

EN IEC 61558-2-20:2025

IEC 61558-2-20:2022 is available as IEC 61558-2-20:2022 RLV which contains the International Standard and its Redline version, showing all changes of the technical content compared to the previous edition.

IEC 61558-2-20:2022 deals with the safety of small reactors for general applications. Small reactors incorporating electronic circuits are also covered by this document. This third edition cancels and replaces the second edition published in 2010. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition:
- adjustment of structure and references in accordance with IEC 61558-1:2017.
- additional Annex AA with references for characteristic parameter measurements.
- additional Annex BB for associated reactors with frequencies above 500 Hz.
- additional Annex CC for partial discharge.
It has the status of a group safety publication in accordance with IEC Guide 104.

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SIST EN IEC 61558-2-7:2025(Main)

Safety of transformers, reactors, power supply units and combinations thereof - Part 2-7: Particular requirements and tests for transformers and power supply units for toys

EN IEC 61558-2-7:2025

IEC 61558-2-7:2023 is available as IEC 61558-2-7:2023 RLV which contains the International Standard and its Redline version, showing all changes of the technical content compared to the previous edition.

IEC 61558-2-7:2023 deals with the safety of transformers for toys and power supply units incorporating transformers for toys. Transformers for toys incorporating electronic circuits are also covered by this document. This third edition cancels and replaces the second edition published in 2007. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition:
a) adjustment of structure and references in accordance with IEC 61558-1:2017;
b) new symbol for power supply unit with linearly regulated output voltage.
It has the status of a group safety publication in accordance with IEC Guide 104.

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SIST

SIST EN IEC 61558-2-4:2025(Main)

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

EN IEC 61558-2-4:2025

Replacement
This part of IEC 61558 deals with the safety of isolating transformers for general applications and power supply units incorporating isolating transformers for general applications.
Transformers incorporating electronic circuits are also covered by this document.
NOTE 1 Safety includes electrical, thermal and mechanical aspects.
Unless otherwise specified, from here onward, the term transformer covers isolating transformers for general applications and power supply units incorporating isolating transformers for general applications.
For power supply units (linear) this document is applicable. For switch mode power supply units, IEC 61558-2-16 is applicable.
This document is applicable to stationary or portable, single-phase or polyphase, air-cooled (natural or forced) independent or associated dry- type transformers. The windings can be encapsulated or non-encapsulated.
The rated supply voltage does not exceed 1 000 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.
This document is applicable to transformers without limitation of the rated output subject to an agreement between the purchaser and the manufacturer.
NOTE 2 Transformers intended to supply distribution networks are not included in the scope.
The no-load output voltage or the rated output voltage does exceed 50 V AC or 120 V ripplefree DC, and where applicable, does not exceed 500 V AC or 708 V ripple-free DC.
The no-load output voltage and the rated output voltage may be up to 1 000 V AC or 1 415 V ripple-free DC for special applications.
This document is not applicable to external circuits and their components intended to be connected to the input terminals and output terminals of the transformers.
NOTE 3 Transformers covered by this document are used in applications where double or reinforced insulation between circuits is required by the installation rules or by the end product standard.
Attention is drawn to the following:
- additional requirements for transformers intended to be used in vehicles, on board ships, and aircraft (from other applicable standards, national rules, etc.);
- measures to protect the enclosure and the components inside the enclosure against external influences such as fungus, vermin, termites, solar-radiation, and icing;
- the different conditions for transportation, storage, and operation of the transformers;
- additional requirements in accordance with other appropriate standards and national rules can be applicable to transformers intended for use in special environments.
Future technological development of transformers can necessitate a need to increase the upper limit of the frequencies. Until then, this document may be used as a guidance document.
This group safety publication focusing on safety guidance is primarily intended to be used as a product safety standard for the products mentioned in the scope, but is also intended to be used by TCs in the preparation of publications for products similar to those mentioned in the scope of this group safety publication, in accordance with the principles laid down in IEC Guide 104 and lSO/lEC Guide 51.
One of the responsibilities of a TC is, wherever applicable, to make use of BSPs and/or GSPs in the preparation of its publications.

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SIST EN IEC 61558-2-15:2025(Main)

Safety of transformers, reactors, power supply units and combinations thereof - Part 2-15: Particular requirements and tests for isolating transformers for medical IT systems for the supply of medical locations

EN IEC 61558-2-15:2025

This part of IEC 61558 deals with safety of isolating transformers for medical IT systems for the supply of medical locations.
NOTE 1 Safety includes electrical, thermal and mechanical aspects.
Unless otherwise specified, from here onward, the term transformer covers isolating transformers for medical IT systems for the supply of medical locations.
This document is applicable to isolating transformers, single-phase or three-phase, air-cooled (natural or forced) dry-type transformers for the supply of medical IT system for group 2 medical locations, designed to be permanently connected to the fixed wiring and intended to form the medical IT system on the secondary side. The windings can be encapsulated or non encapsulated.
NOTE 2 IT systems are defined in IEC 60364-1.
The installation rules for medical IT system for group 2 medical locations are covered by IEC 60364-7-710.
Transformers covered by this document are intended for medical IT systems for the supply of medical locations. All other transformers or equipments connected downstream from the transformer are not covered by this document.
The rated supply voltage does not exceed 1 000 V AC. The rated supply frequency and internal operational frequency do not exceed 500 Hz.
The rated output does not be less than 0,5 kVA and does not exceed 10 kVA for single-phase and three-phase transformers for medical IT system for group 2 medical locations.
This document may be applicable to isolating transformers intended to supply other medical installations that are not group 2 medical locations without limitation of the rated output subject to an agreement between the purchaser and the manufacturer.
NOTE 3 Transformers intended to supply distribution networks other than medical IT systems are not included in the scope.
The no-load output voltage and the rated output voltage does not exceed 250 V AC for single-phase or three-phase transformer (phase-to-phase voltage).
This document does not cover power supply units and is not intended to be used in conjunction with IEC 61558-2-16 for switch mode power supply units.
This document is not applicable to external circuits and their components intended to be connected to the input terminals and output terminals of the transformers.
Transformers covered by this document are used in applications where double or reinforced insulation between circuits is required by the installation rules or by the appliance specification.
NOTE National installation rules of some countries have different or additional requirements listed in Annex C of IEC 60364-7-710:2021.
Attention is drawn 193 to the following:
- for transformers intended to be used in vehicles, on board ships, and aircraft, additional requirements (from other applicable standards, national rules, etc.);
- measures to protect the enclosure and the components inside the enclosure against external influences such as fungus, vermin, termites, solar-radiation, and icing;
- the different conditions for transportation, storage, and operation of the transformers;
- additional requirements in accordance with other appropriate standards and national rules may be applicable to transformers intended for use in special environments.
This GROUP SAFETY PUBLICATION focusing on SAFETY guidance is primarily intended to be used as a PRODUCT SAFETY STANDARD for the products mentioned in the scope, but is also intended to be used by TCs in the preparation of publications for products similar to those mentioned in the scope of this GROUP SAFETY PUBLICATION, in accordance with the principles laid down in IEC Guide 104 and lSO/lEC Guide 51.
One of the RESPONSIBILITIES of a TC is, wherever applicable, to make use of BSPs and/or GSPs in the preparation of its publications.

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SIST EN IEC 61558-2-3:2025(Main)

Safety of transformers, reactors, power supply units and combinations thereof - Part 2-3: Particular requirements and tests for ignition transformers for gas and oil burners

EN IEC 61558-2-3:2025

IEC 61558-2-3:2023 is available as IEC 61558-2-3:2023 RLV which contains the International Standard and its Redline version, showing all changes of the technical content compared to the previous edition.
This part of IEC 61558 deals with the safety of ignition transformers for gas and oil burners. Ignition transformers incorporating electronic circuits are also covered by this document. This third edition cancels and replaces the second edition published in 2010. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition:
a) adjustment of structure and references in accordance with IEC 61558-1:2017.
It has the status of a group safety publication in accordance with IEC Guide 104. The contents of the corrigendum 1 (2023-09) have been included in this copy.

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SIST EN IEC 61558-2-13:2025(Main)

Safety of transformers, reactors, power supply units and combinations thereof - Part 2-13: Particular requirements and tests for auto transformers and power supply units incorporating auto transformers for general applications

EN IEC 61558-2-13:2025

This part of IEC 61558 deals with the safety of auto-transformers for general applications and power supply units incorporating auto-transformers for general applications. Transformers incorporating electronic circuits are also covered by this document.
NOTE 1 Safety includes electrical, thermal and mechanical aspects.
Unless otherwise specified, from here onward, the term transformer covers auto-transformers for general applications and power supply units incorporating auto-transformers for general applications.
For power supply units (linear) this document is applicable. For switch mode power supply units IEC 61558-2-16 is applicable.
This document is applicable to stationary or portable, single-phase or polyphase, air-cooled (natural or forced) independent or associated dry- type transformers. The windings may be encapsulated or non-encapsulated.
The rated supply voltage does not exceed 1 000 V AC, and the rated supply frequency and the internal operating frequencies do not exceed 500 Hz.
The core power does not exceed:
- 2 kVA for single-phase transformers;
- 10 kVA for polyphase transformers.
The rated output does not exceed:
- 40 kVA for single-phase transformers;
- 200 kVA for polyphase transformers.
This document is applicable to transformers without limitation of the core power and the rated output both being subject to an agreement between the purchaser and the manufacturer.
Where applicable, the no-load output voltage or the rated output voltage does not exceed 1 000 V AC or 1 415 V ripple-free DC. For independent transformers, the no-load output voltage and the rated output voltage is not less than 50 V AC or 120 V ripple-free DC.
This document is not applicable to external circuits and their components intended to be connected to the input terminals and output terminals of the transformers.
NOTE 2 Transformers covered by this document are used only in applications where no insulation between circuits is required by the installation rules or by the end product standard.
Attention is drawn to the following:
- for transformers intended to be used in vehicles, on board ships, and aircraft, additional requirements (from other applicable standards, national rules, etc.);
- measures to protect the enclosure and the components inside the enclosure against external influences such as fungus, vermin, termites, solar-radiation, and icing;
- the different conditions for transportation, storage, and operation of the transformers;
- additional requirements in accordance with other appropriate standards and national rules may be applicable to transformers intended for use in special environments.
Future technological development of transformers may necessitate a need to increase the
202 upper limit of the frequencies. Until then this document may be used as a guidance document.
This GROUP SAFETY PUBLICATION focusing on SAFETY guidance is primarily intended to be used as a PRODUCT SAFETY STANDARD for the products mentioned in the scope, but is also intended to be used by TCs in the preparation of publications for products similar to those mentioned in the scope of this GROUP SAFETY PUBLICATION, in accordance with the principles laid down in IEC Guide 104 and lSO/lEC Guide 51.
One of the RESPONSIBILITIES of a TC is, wherever applicable, to make use of BSPs and/or GSPs in the preparation of its publications.

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SIST EN IEC 61558-2-6:2025(Main)

Safety of transformers, reactors, power supply units and combinations thereof - Part 2-6: Particular requirements and tests for safety isolating transformers and power supply units incorporating safety isolating transformers for general applications

EN IEC 61558-2-6:2025

IEC 61558-2-6:2021 is available as IEC 61558-2-6:2021 RLV which contains the International Standard and its Redline version, showing all changes of the technical content compared to the previous edition.

IEC 61558-2-6:2021 deals with the safety of safety isolating transformers for general applications and power supply units incorporating safety isolating transformers for general applications. Transformers incorporating electronic circuits are also covered by this document. This third edition cancels and replaces the second edition published in 2009. This edition constitutes a technical revision.
- adjustment of structure and references in accordance with IEC 61558-1:2017;
- description of constructions moved in IEC 61558-1:2017;
- new symbol for power supply unit with linearly regulated output voltage.
It has the status of a group safety publication in accordance with IEC Guide 104.
This International Standard is to be used in conjunction with IEC 61558-1:2017.

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SIST EN IEC 61558-2-23:2025(Main)

Safety of transformers, reactors, power supply units and combinations thereof - Part 2-23: Particular requirements and tests for transformers and power supply units for construction sites

EN IEC 61558-2-23:2025

IEC 61558-2-23:2024 is available as IEC 61558-2-23:2024 RLV which contains the International Standard and its Redline version, showing all changes of the technical content compared to the previous edition.

IEC 61558-2-23:2024 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 third edition cancels and replaces the second edition published in 2010. This edition constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous edition:
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.
It has the status of a group safety publication in accordance with IEC Guide 104.

Standard
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27-Feb-2023
03-Apr-2025
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Safety of transformers, reactors, power supply units and combinations thereof - Part 1: General requirements and tests

Sicherheit von Transformatoren, Netzgeräten, Drosseln und entsprechenden Kombinationen - Teil 1: Allgemeine Anforderungen und Prüfungen

Sécurité des transformateurs, bobines d'inductance, blocs d'alimentation et des combinaisons de ces éléments - Partie 1: Exigences générales et essais

Varnost transformatorjev, reaktorjev, napajalnikov in kombinacij teh elementov - 1. del: Splošne zahteve in preskusi - Popravek AC

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