IEC 61058-1:2026: What the 5th Edition Changes for OEMs

On 30 July 2026 the IEC published IEC 61058-1:2026, Switches for appliances – Part 1: General requirements, as the fifth edition. It cancels and replaces the 2016 fourth edition and, in the IEC's own wording, "constitutes a technical revision." Not a reprint, and not an amendment.

If your product file still cites "IEC 61058-1:2016" and nobody has touched it since, this is the moment to look at it. Here is what actually changed, and what each change does to a switch specification on a real project.

Short answer: the fifth edition adds a DC arc extinction test, adds ground-fuse requirements, and lifts the scope to 600 V and 63 A. Certificates already issued against the 2016 edition are not cancelled by the publication — but new filings and any DC-rated tool switch deserve a fresh look.

The six changes, verbatim from the publication

The IEC Webstore lists six significant technical changes against the previous edition:

1. Extension to 600 V in the scope. The standard now covers appliance switches up to 600 V, with rated current up to 63 A.
2. Requirements on ground-fuse (Clause 17). New material, not a clarification of existing text.
3. DC arc extinction test (Annex P and Clause 17). A test that did not exist in the 2016 edition.
4. Table 5 re-arranged to line up with classifications.
5. Table 6 corrected for inhomogeneous values.
6. Deletion of X3 capacitors from the classification and from Table 19.

Two of those six are paperwork. Four change what a design has to prove or has to stop containing. That second group is where the schedule risk sits, so the rest of this page is about it.

Why the DC arc test is the one to watch

Of the six, "DC arc extinction test" is the item that will move delivery dates for anyone building cordless tools.

Alternating current crosses zero a hundred times a second at 50 Hz. The arc that forms when a contact opens gets extinguished for free at the next zero crossing. Direct current does not do that. Open a 30 A DC circuit and the arc keeps burning until the gap is long enough or the energy runs out. That is why DC-rated switches carry harder contact-erosion and gap requirements than AC switches of the same nominal current.

Our JT02-3A cordless angle grinder switch is rated DC 40 V / 250 V~, 30 A / 12(10) A, with 50,000 electrical operations. It is already tested to CE (EN 61058) and UL (UL 61058). A dedicated DC arc extinction test in the base standard changes the evidence package around that rating. Not the mechanical design. What has to be demonstrated, and by which test sequence. If you are mid-programme on a DC tool switch, ask your supplier now whether the DC arc evidence in their file is from an Annex P test or from an older endurance test being read as a substitute. Those are not the same thing.

Ground-fuse requirements, and the 600 V scope

Clause 17 now carries requirements on ground-fuse. For switches used on earthed appliances, which covers most metal-bodied woodworking and garden machinery, this touches the failure-mode analysis and not just the marking. Worth a review if your end product relies on the switch enclosure as part of the protective bonding path.

The 600 V extension is the quieter change. It widens the scope upward, which matters for anyone using appliance switches in higher-voltage DC or three-phase-adjacent control circuits and who previously found the standard's ceiling awkward. It does not change the rating of a 250 V~ switch. A DZ-6-2M stays 16(15) A at 250 V~ with T85/T55 and IP55, exactly as certified. Scope is not rating.

Tables 5, 6 and the X3 capacitor deletion

Not glamorous, but this is where documentation errors come from. Table 5 has been re-arranged to align with classifications; Table 6 corrected where values were inhomogeneous. If your technical file quotes a Table 5 or Table 6 value from the 2016 edition and pastes it into a 2026 declaration, the numbers may no longer sit where you think they do.

The X3 capacitor deletion is narrow but absolute: X3 capacitors are gone from the classification and from Table 19. Any design that lists an X3 across the mains as part of its switch-related suppression should be re-examined. Not necessarily redesigned, but checked against what the new edition now permits.

What happens to the certificate you already hold

This is the question buyers ask first, and the honest answer is: publication of a new edition does not automatically void a certificate issued against the old one. Certifications are evaluated against the edition in force when they were issued, and they remain valid within their own validity period and under the issuing body's surveillance regime. The transition timetable for new projects is set by the certification body and by your end market's regulator, not by the IEC publication date.

What the 2029 stability date tells you is the planning horizon. You are not looking at a twelve-month cliff. You are looking at a multi-year window in which new programmes will increasingly be filed against the fifth edition while existing ones run out their current evidence.

What DKLD is doing

Our switch ranges — the DZ04, DZ-6 and the JT02 30 A DC series — are certified under the EN 61058 / UL 61058 framework: TÜV and CE to EN 61058 (the DZ-6-2M additionally to EN 60947), and UL 61058 for the LDZ-6-2M at 18(18) A, 127 V~. We are monitoring the fifth edition and validating the range against it, with the DC arc extinction provisions getting most of the attention because of the 30 A DC cordless-tool switches.

Where we are not yet able to answer: we cannot tell you today that a given model has completed fifth-edition testing, because that work is in progress. If a programme depends on it, say so early and we will tell you exactly where that model stands. Certificate documents and verification guidance for the current certifications are shared during technical review — see the Certificate Library.

A short checklist before you re-file

• Locate every place your documentation cites IEC 61058-1 and record the edition.
• For DC-rated switches, confirm the arc extinction evidence is a DC arc test, not AC endurance data.
• Re-check any Table 5 / Table 6 value copied into a declaration.
• Check whether any design lists an X3 capacitor across the mains.
• Ask the certification body, in writing, which edition new filings will be assessed against.

Background on how the IEC base standard maps onto the two market adoptions is in our guide to UL 61058 vs EN 61058, and the application side is covered in cordless tool DC switches.

FAQ

Does IEC 61058-1:2026 invalidate my existing EN 61058 or UL 61058 certificate?

No. A certificate is evaluated against the edition in force when it was issued and stays valid within its own validity period, under the issuing body's surveillance. The fifth edition affects what new filings are assessed against, and that timetable is set by the certification body and your end market.

Do I have to re-test a 250 V~ appliance switch because the scope now goes to 600 V?

No. The scope extension widens the range of switches the standard covers. It does not change the rating of an existing 250 V~ switch; a 16(15) A, 250 V~ switch stays a 16(15) A, 250 V~ switch.

Which DKLD products are most affected by the DC arc extinction test?

The DC-rated cordless-tool switches, principally the JT02-3A, rated DC 40 V / 250 V~ at 30 A / 12(10) A with 50,000 electrical operations and certified to CE (EN 61058) and UL (UL 61058). The AC electromagnetic switch ranges — DZ-6-2M at 16(15) A, 250 V~, and LDZ-6-2M at 18(18) A, 127 V~ — are less exposed to this particular change.

What is the deadline for moving to the fifth edition?

There is no single global deadline, and anyone quoting you one is guessing. The IEC gives a stability date of 2029, which indicates the revision horizon. Adoption dates come from the certification bodies and from regional regulators. Ask your certification body for the transition schedule that applies to your file.

What should I ask a switch supplier about IEC 61058-1:2026?

Four things: which edition their current certificate was issued against; whether DC arc evidence exists as a dedicated DC arc test; whether their documentation still quotes 2016 Table 5 / Table 6 values; and whether any design uses an X3 capacitor across the mains. Answers to those four tell you more than a badge image.

Working through a re-file or a new DC tool programme? Contact DKLD — our engineering team will tell you exactly where each model stands against the fifth edition.