IEC 62368-1 Explained: Power Adapter Safety

Last Updated: August 24, 2026 · Reviewed by the Sunshine Electronics engineering team

This is a compliance explainer on the IEC 62368-1 safety standard for power adapters. For the full AC adapter reference, see our AC Adapter Engineer’s Guide.

Quick answer

IEC 62368-1 is the global product-safety standard for audio/video and IT/communication equipment — including their external power supplies. It replaced the older IEC/UL 60950-1 (IT) and 60065 (AV) standards, has been mandatory since December 2020, and is now on its 4th edition (2023). Its core idea is hazard-based safety engineering: classify energy sources by the harm they can do, then guard against each.

If you build or source a power adapter, IEC 62368-1 is the safety standard your product lives or dies by — it is what a test lab certifies against, what customs and retailers check for, and what your customer’s compliance team will ask about first. Yet it is widely misunderstood, partly because it replaced two familiar standards at once and works on a different principle than they did. This guide explains what it is, what changed, and what it means when you spec an adapter.

It is written by the engineering team at Sunshine Electronics — 22+ years building power adapters certified to IEC 62368-1 and its regional versions, across our dual-factory operations in China and Vietnam, alongside FCC Part 15-B, CE, DoE Level VI, and RoHS. Getting this standard right is a routine part of every program we ship.

Contents

01What Is IEC 62368-1?
02Hazard-Based Safety Engineering: The Big Shift
03IEC vs UL vs EN 62368-1: The Regional Versions
0462368-1 vs 60950-1: What Changed
05What It Means for Sourcing a Power Adapter
06Frequently Asked Questions

What Is IEC 62368-1?

IEC 62368-1 is the international product-safety standard for audio/video, information and communication technology equipment — the broad family that covers computers, networking gear, displays, and the external power supplies and adapters that run them. When a lab certifies an adapter to UL 62368-1 testing and certification, they are verifying its construction, insulation, creepage and clearance, and fault behavior against this standard.

The important structural fact is that it consolidated two older standards: IEC 60950-1, which covered IT equipment, and IEC 60065, which covered audio/video. As the line between a computer, a TV, and a phone charger dissolved, maintaining two separate safety standards stopped making sense, so 62368-1 merged them into one framework — and rebuilt the approach from the ground up rather than just stapling the two together.

Hazard-Based Safety Engineering: The Big Shift

That rebuilt approach is the part worth understanding, because it is genuinely different. The old standards were prescriptive: they listed constructions and said “do it this way.” IEC 62368-1 is built on hazard-based safety engineering (HBSE), which flips the logic — instead of prescribing constructions, it identifies the energy sources in a product that could cause harm, classifies each by severity, and requires guarding proportional to the hazard. The UL introduction to the standard walks through the model in detail.

In practice HBSE sorts energy into three classes. Class 1 sources are low enough to be harmless. Class 2 can cause pain or ignition but not injury or serious fire. Class 3 can cause injury or a spreading fire. The standard applies the same 1/2/3 grading to electrical energy sources (ES1–ES3), power/power sources (PS1–PS3), and thermal and mechanical hazards, then dictates the barriers — insulation, enclosures, interlocks — each class requires. For a power adapter, the mains input is a Class 3 electrical source and the low-voltage output is typically Class 1 or 2, which is why the isolation between them is the heart of the design.

From our certification team

the shift buyers miss is that HBSE makes the standard about energy and barriers, not a checklist of parts. When we review a design against 62368-1, we trace every energy source to its class and confirm the guarding matches — because a construction that would have passed 60950 by rote can still fail 62368-1 if the hazard analysis does not hold up.

IEC vs UL vs EN 62368-1: The Regional Versions

The one standard has several regional faces, and buyers routinely trip over the names. IEC 62368-1 is the base international standard. UL 62368-1 is the North American adoption (with US and Canadian national differences), and EN IEC 62368-1 is the European adoption harmonized under the EU Low Voltage Directive that underpins CE marking. They are the same core standard with regional deviations, not different standards.

For a product sold globally, that means one design generally satisfies all three, but the test report and certificate must name the right national versions for each market you ship to. A CB Scheme test report from an accredited lab is the usual vehicle, letting a single evaluation roll into UL, EN, and other national certifications with their deltas. Confirm which versions your certificate actually covers — a report against the IEC base alone does not automatically satisfy the US or EU national requirements.

62368-1 vs 60950-1: What Changed

Because 62368-1 replaced IEC/UL 60950-1, the most common question is what actually changed for a power adapter. The headline is the deadline: 62368-1 became the mandatory standard, with 60950-1 (and 60065) withdrawn for new products, on 20 December 2020 in the US, Canada, and EU — a supply still certified only to 60950-1 is no longer acceptable for new equipment, as the UL analysis of the transition documents.

Beyond the date, the change is philosophical more than dimensional: many specific requirements carried over with similar numbers, but they now hang off the hazard-based framework rather than prescriptive tables, and the standard covers a wider range of technologies and higher-power cases than 60950-1 did. It has since moved to its 4th edition (2023), which refines the model further. For a buyer the practical upshot is simple: your adapter must carry a current 62368-1 certificate, and a legacy 60950-1 mark is a red flag, not a credential.

What It Means for Sourcing a Power Adapter

For sourcing, IEC 62368-1 comes down to a few concrete checks. First, confirm the supply carries a current 62368-1 certificate (not 60950-1), to the editions your markets require, from an accredited lab. Second — the step buyers skip — get the test report and confirm it names your exact voltage, wattage, and connector variant; a certificate for a sibling model does not cover a different SKU. Third, remember that 62368-1 is a safety standard: it does not cover electromagnetic emissions, which is a separate FCC Part 15 Subpart B (and CE EMC) requirement your supply also has to meet.

Treat the standard as one line in a compliance stack, not the whole thing. A compliant power adapter pairs 62368-1 safety with EMC, efficiency (and, above 75 W, power factor correction), and any market-specific marks. For related compliance topics, see our Class 2 power supply guide, and for the form factors this all applies to, our wall-mount adapter range.

From our compliance team

the fastest way we catch a weak supplier is to ask for the 62368-1 test report keyed to the exact model, then check the edition and the national annexes. A vague answer, a 60950-1 certificate, or a report for a different wattage is the tell — the mark on the box means nothing if the report behind it does not cover the SKU you are buying.

Frequently Asked Questions

What is IEC 62368-1?

The international product-safety standard for audio/video and IT/communication equipment and their external power supplies. It replaced IEC/UL 60950-1 (IT) and 60065 (AV), and is built on hazard-based safety engineering — classifying energy sources by the harm they can cause and guarding against each.

Is IEC 62368-1 mandatory?

Yes for new products. It became the required standard, with 60950-1 and 60065 withdrawn for new equipment, on 20 December 2020 in the US, Canada, and EU. New power adapters must be certified to a current edition of 62368-1.

What is the difference between IEC 62368-1 and 60950-1?

60950-1 was a prescriptive IT-equipment standard; 62368-1 merged it with the AV standard (60065) and rebuilt the approach around hazard-based safety engineering. Many requirements carried over, but they now derive from an energy-hazard analysis rather than fixed construction tables. 60950-1 is withdrawn for new products.

What is the difference between IEC, UL, and EN 62368-1?

They are the same core standard with regional deviations: IEC is the international base, UL 62368-1 is the North American adoption, and EN IEC 62368-1 is the European adoption used for CE. A global design usually meets all three, but the certificate must name the versions for each target market.

Does IEC 62368-1 cover EMC?

No. It is a safety standard covering electrical, fire, and injury hazards. Electromagnetic emissions are a separate requirement — FCC Part 15 in the US and the EMC Directive for CE — that a power supply must also meet alongside 62368-1.

Conclusion

IEC 62368-1 is the safety standard that governs power adapters and the AV/ICT equipment they power. It replaced the older 60950-1 and 60065, has been mandatory for new products since December 2020, and works on hazard-based safety engineering — energy sources classified by harm, guarded in proportion — rather than prescriptive tables. Its regional faces (IEC, UL, EN) are one standard with national deviations.

For an OEM the standard reduces to discipline: insist on a current 62368-1 certificate and a test report keyed to your exact SKU and target markets, and treat safety as one line in a stack that also includes EMC and efficiency. Get that right and the standard stops being a mystery and becomes a checkbox you can actually verify.

Ready to Source a 62368-1-Compliant Adapter?

Sunshine builds power adapters certified to IEC 62368-1 and its UL and EN regional versions — with test reports keyed to each SKU, alongside FCC, CE, and DoE Level VI — at our dual-factory operations in China and Vietnam, so one certified design ships compliantly across markets. See our 12V power supply guide for the product side, and our OEM program team returns a quoted spec sheet with the full certification scope within 3 business days of an RFQ.

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