SIST EN IEC 60269-1:2025/oprA1:2026

• Status: Not Published
• Public Enquiry End Date: 29-Nov-2026
• ICS: 29.120.50 - Fuses and other overcurrent protection devices
• Technical Committee: EVA - Fuses
• Current Stage: 4020 - Public enquire (PE) (Adopted Project)
• Start Date: 28-Sep-2026
• Due Date: 15-Feb-2027
• Ref Project: EN IEC 60269-1:2025/prA1:2026 - Amendment 1 - Low-voltage fuses - Part 1: General requirements

• Amends: SIST EN IEC 60269-1:2025 - Low-voltage fuses - Part 1: General requirements (IEC 60269-1:2024)
• Effective Date: 22-Jul-2025

SIST EN IEC 60269-1:2025/oprA1:2026 is a CLC amendment to IEC 60269-1 for low-voltage fuses. It updates the general requirements for fuse design, marking, installation conditions and test methods used by manufacturers, test laboratories and specifiers of fuse equipment. The amendment also aligns the European text with Low Voltage Directive-related changes and adds technical corrections.

What does SIST EN IEC 60269-1:2025/oprA1:2026 specify?

SIST EN IEC 60269-1:2025/oprA1:2026 amends Part 1 of IEC 60269, the general requirements for low-voltage fuses. It keeps the Part 1 structure and revises selected clauses on scope notes, references, terms, service conditions, construction and tests.

The scope note points users to separate standards for some special fuse applications, such as rolling stock and high-frequency circuits.

Main clauses covered by the amendment:

• Clause 1 - Scope
• Clause 2 - Normative references
• Clause 3 - Terms and definitions
• Clause 4 - Conditions for operation in service
• Clause 8 - Standard conditions for construction
• Clause 9 - Tests
• Bibliography

What are the key requirements of SIST EN IEC 60269-1:2025/oprA1:2026?

Design and marking

Clause 3 adds impulse withstand voltage (Uimp) for fuse-holders. In practice, this gives a named insulation limit that designers and test labs can use when checking surge withstand capability.

Clause 8 tightens the link between creepage distances, material group and rated voltage. For readers, that means insulation layout must be checked against both the voltage rating and the insulating material used.

Clause 8 also requires fuse-holders suitable for isolation to carry the same symbol as fuse-disconnectors. This matters because the marking tells installers and buyers that the device can be used as an isolation function.

Service conditions

Clause 4 states that the time-current characteristics are related to a reference ambient air temperature of 20 °C. If a product behaves differently at other temperatures, the correction factors belong in the product documentation.

Clause 4 also notes that vibrations and shock are outside the normal use conditions considered here. In practice, products for harsher environments need separate justification or separate standards.

Test and acceptance rules

Clause 9 updates the acceptability rule for insulation resistance by voltage range. This is important for test reports because the pass criterion changes with the rated voltage of the fuse or fuse-holder.

Clause 9 revises the conductor cross-sectional areas used in power dissipation tests and updates the AC and DC breaking-capacity test settings. It also refines recovery voltage and current-calibration conditions, which affect how interruption tests are set up and repeated.

Clause 9 keeps a service-condition test for contacts left undisturbed. That test checks whether contacts deteriorate in normal service, so it supports durability claims and conformity assessment.

Clause 9 also updates the fire-related material-retention test for insulating parts and points readers to the IEC 60695 glow-wire methods in the bibliography. For users, that links fuse construction to fire behaviour testing.

What terms does SIST EN IEC 60269-1:2025/oprA1:2026 define?

• Impulse withstand voltage (Uimp) - the highest peak impulse voltage of prescribed form and polarity that a fuse-holder insulation can withstand without breakdown.
• Fuse-holder suitable for isolation - a fuse-holder that is marked with the same double-opening symbol used for fuse-disconnectors.
• Time-current characteristics - the operating curves or data that relate current to operating time, with a 20 °C reference in this amendment.
• Creepage distances - the surface distances in insulation that must match the rated voltage and the material group.
• Prospective test current - the current used to set up breaking-capacity tests so the fuse is tested under representative arc-energy conditions.
• Recovery voltage - the voltage maintained across the fuse after operation during interruption testing.
• Fuse-link - the replaceable fuse element that opens the circuit when overcurrent conditions require interruption.

Who uses SIST EN IEC 60269-1:2025/oprA1:2026?

• Fuse manufacturers use it to design fuse-links and fuse-holders, set ratings and prepare product documentation.
• Test laboratories use it to set up type tests, interruption tests and insulation checks.
• Certification and conformity assessment bodies use it to judge whether test evidence matches the general requirements.
• Electrical equipment and switchgear manufacturers use it when integrating fuse-holders, isolation functions and wiring arrangements.
• Designers and specifiers use it when selecting low-voltage fuse equipment for industrial installations and other electrical systems.
• Buyers and quality managers use it to compare products against the same general technical baseline.

What changed in SIST EN IEC 60269-1:2025/oprA1:2026 from the previous edition?

SIST EN IEC 60269-1:2025/oprA1:2026 is the first amendment to Edition 5.0 of IEC 60269-1. It states that it reflects European-level changes made to meet the Low Voltage Directive requirements and includes minor technical corrections.

The amendment changes the scope note, updates several normative references, adds Uimp, revises service-condition notes, changes construction marking and creepage guidance, and updates test criteria and test setup details.

Which standards are used with SIST EN IEC 60269-1:2025/oprA1:2026?

Standard	What it contributes
IEC 60947-3:2020/AMD1:2025	Symbol and related requirements for fuse-disconnectors and fuse-combination units
IEC 60050-441:1984/AMD1:2020	Vocabulary for switchgear, controlgear and fuses
IEC 60364-5-52:2009	Wiring system guidance used in the cable overload protection test
IEC 60664-1:2020	Insulation coordination basis for clearance and creepage decisions
IEC 60269-2:2013/AMD1:2016/AMD2:2024	Supplementary requirements for fuses for use by authorized persons
IEC 60695-2-10:2021	Glow-wire apparatus and common test procedure mentioned in the bibliography
IEC 60695-2-11:2021	Glow-wire flammability test method for end products mentioned in the bibliography

The foreword also lists IEC 60269 parts 2 to 7 as companion parts under the same family title.

What does the SIST EN IEC 60269-1:2025/oprA1:2026 document contain?

The amendment updates clause text, notes and tables rather than adding a full new structure. It revises the test conditions in Clause 9, including the AC and DC breaking-capacity calibration tables and the conductor selection table for power dissipation tests.

It also references Figure 2 and Figure 3 for the factor k, and it updates the service-condition and insulation-related test language so laboratories can apply the revised conditions consistently.

SLOVENSKI STANDARD
01-november-2026
Nizkonapetostne varovalke - 1. del: Splošne zahteve - Dopolnilo 1
Amendment 1 - Low-voltage fuses - Part 1: General requirements
Niederspannungssicherungen - Teil 1: Allgemeine Anforderungen
Fusibles basse tension - Partie 1: Exigences générales
Ta slovenski standard je istoveten z: EN IEC 60269-1:2025/prA1:2026
ICS:
29.120.50 Varovalke in druga Fuses and other overcurrent
nadtokovna zaščita protection devices
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

32B/790/CDV
COMMITTEE DRAFT FOR VOTE (CDV)
PROJECT NUMBER:
IEC 60269-1/AMD1 ED5
DATE OF CIRCULATION: CLOSING DATE FOR VOTING:
2026-09-18 2026-12-11
SUPERSEDES DOCUMENTS:
32B/775/RR
IEC SC 32B : LOW-VOLTAGE FUSES
SECRETARIAT: SECRETARY:
Germany Mr Andreas Schüppel
OF INTEREST TO THE FOLLOWING COMMITTEES: HORIZONTAL FUNCTION(S):
SC 23E,SC 23H,TC 82,SC 121A
ASPECTS CONCERNED:
Electricity transmission and distribution,Safety
SUBMITTED FOR CENELEC PARALLEL VOTING NOT SUBMITTED FOR CENELEC PARALLEL VOTING
Attention IEC-CENELEC parallel voting
The attention of IEC National Committees, members of
CENELEC, is drawn to the fact that this Committee Draft
for Vote (CDV) is submitted for parallel voting.
The CENELEC members are invited to vote through the
CENELEC online voting system.
This document is still under study and subject to change. It should not be used for reference purposes.
Recipients of this document are invited to submit, with their comments, notification of any relevant patent rights of
which they are aware and to provide supporting documentation.
Recipients of this document are invited to submit, with their comments, notification of any relevant “In Some
Countries” clauses to be included should this proposal proceed. Recipients are reminded that the CDV stage is
the final stage for submitting ISC clauses. (SEE AC/22/2007 OR NEW GUIDANCE DOC).

TITLE:
Amendment 1 - Low-voltage fuses - Part 1: General requirements

PROPOSED STABILITY DATE: 2035
NOTE FROM TC/SC OFFICERS:
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IEC CDV 60269-1/AMD1 © IEC 2026
2 INTERNATIONAL ELECTROTECHNICAL COMMISSION
3 ____________
5 LOW-VOLTAGE FUSES –
7 Part 1: General requirements
9 FOREWORD
10 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
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32 6) All users should ensure that they have the latest edition of this publication.
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38 8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
39 indispensable for the correct application of this publication.
40 9) IEC draws attention to the possibility that the implementation of this document may involve the use of (a)
41 patent(s). IEC takes no position concerning the evidence, validity or applicability of any claimed patent rights in
42 respect thereof. As of the date of publication of this document, IEC had not received notice of (a) patent(s), which
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44 the latest information, which may be obtained from the patent database available at https://patents.iec.ch. IEC
45 shall not be held responsible for identifying any or all such patent rights.
46 IEC 60269-1 has been prepared by subcommittee 32B: Low-voltage fuses, of IEC technical
47 committee 32: Fuses. It is an International Standard.
48 This is the first amendment to Edition 5.0 of IEC 60269-1. It considers changes introduced at
49 European level to fulfil the requirements of the Low Voltage Directive. Furthermore, it includes
50 minor technical corrections.
51 The text of this International Standard is based on the following documents:
Draft Report on voting
32B/XX/FDIS 32B/XX/RVD
53 Full information on the voting for its approval can be found in the report on voting indicated in
54 the above table.
55 The language used for the development of this International Standard is English.
IEC CDV 60269-1/AMD1 © IEC 2026
56 This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in
57 accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available
58 at www.iec.ch/members_experts/refdocs. The main document types developed by IEC are
59 described in greater detail at www.iec.ch/publications.
60 IEC 60269 consists of the following parts, under the general title Low-voltage fuses:
61 Part 1: General requirements
62 Part 2: Supplementary requirements for fuses for use by authorized persons (fuses mainly
63 for industrial application) – Examples of standardized systems of fuses A to I
64 Part 3: Supplementary requirements for fuses for use by unskilled persons (fuses mainly for
65 household or similar application) – Examples of standardized systems of fuses A to
66 F
67 Part 4: Supplementary requirements for fuse-links for the protection of semiconductor
68 devices
69 Part 5: Guidance for the application of low-voltage fuses
70 Part 6: Supplementary requirements for fuse-links for the protection of solar photovoltaic
71 energy systems
72 Part 7: Battery Fuses
73 For reasons of convenience, when a part of this publication has come from other publications,
74 a remark to this effect has been inserted in the text.
75 The committee has decided that the contents of this document will remain unchanged until the
76 stability date indicated on the IEC website under webstore.iec.ch in the data related to the
77 specific document. At this date, the document will be
78 − reconfirmed,
79 − withdrawn, or
80 − revised.
IEC CDV 60269-1/AMD1 © IEC 2026
83 LOW-VOLTAGE FUSES –
85 Part 1: General requirements
87 1 Scope
88 Replace NOTE 1 with the following text:
89 NOTE 1 Modifications of, and supplements to, this document required for certain types of fuses for particular
90 applications – for example, certain fuses for rolling stock, or fuses for high-frequency circuits – are covered by
91 separate standards.
92 2 Normative references
93 Add the following references:
94 IEC 60947-3:2020/AMD1:2025 - Low-voltage switchgear and controlgear - Part 3: Switches,
95 disconnectors, switch-disconnectors and fuse-combination units
96 IEC 60050-441:1984/AMD1:2020 – International Electrotechnical Vocabulary (IEV) – Chapter 441:
97 Switchgear, controlgear and fuses
98 IEC 60364-5-52:2009 - Low-voltage electrical installations – Part 5-52: Selection and erection of
99 electrical equipment – Wiring systems
100 Delete the following reference:
101 IEC 60617, Graphical symbols for diagrams
102 Update the reference to IEC 60664-1 to read:
103 IEC 60664-1:2020 - Insulation coordination for equipment within low-voltage supply systems - Part 1:
104 Principles, requirements and tests
105 Update the reference to IEC 60269-2 to read:
106 IEC 60269-2:2013/AMD1:2016/AMD2:2024 - Low-voltage fuses - Part 2: Supplementary requirements
107 for fuses for use by authorized persons (fuses mainly for industrial application) - Examples of
108 standardized systems of fuses A to K
109 3 Terms and definitions
110 3.3 C
...