The short answer
A certificate covers the models named on it.
Not the models that look like them. Not the models from the same factory. Not the "same series" unless your model is listed.
This sounds obvious. It is also one of the most common reasons a perfectly good shipment gets held at the port or pulled from a listing.
Why this keeps happening
Most buyers check the certificate for three things: the standard, the issuing body, and the expiry date. All three are important.
Almost nobody checks the fourth thing — whether their model number actually appears on the document.
The gap is easy to miss because everything looks right. The factory is certified. The standard is correct. The document is signed and dated. It just does not name the product you are buying.
What "series coverage" actually means
Certification bodies do allow one certificate to cover several models. It saves money and it is completely legitimate.
But coverage is not automatic. It is granted after an assessment, and the assessment asks one question: do these models differ in any way that could change the safety result?
The underlying standards are international — IEC 62368-1 for chargers, IEC 60884-1 for socket-outlets. Each region then publishes its own version of them, which is why the same product needs different documents for different markets.
The test is not visual. It is not about colour, packaging, or printed branding. The test is whether these are the same product underneath:
| Dimension | Same series if… | Separate product if… |
|---|---|---|
| Circuit design / PCB | Identical layout and rating | Different topology or protection circuit |
| Enclosure material | Same resin, same flame rating | Different material or different flame class |
| Internal components | Same approved parts, same suppliers | Different key parts (fuse, capacitor, transformer) |
| Ratings | Covered by the tested worst case | Wider voltage, higher current, new output profile |
| Plug / socket configuration | Same configuration as tested | Different plug type, different socket standard |
Close enough is not close enough. A "family certificate" helps you only if your model is named in it.
The practical consequence: adding a model to a series is a formal process with a paper trail. It produces an updated certificate or an annex, not a verbal assurance.
Why the factory will not tell you
It is tempting to assume the supplier would speak up if your model were not covered.
Usually they will not. Not out of bad faith — out of how the work is divided.
The salesperson quoting you has the certificate in a folder. They check that it is valid, that it names the factory, and that the standard matches what you asked for. Nobody asks them to compare your model number against an annex, so they do not.
The engineer who knows which models are covered sits in another department and is not copied on your order.
And the certificate does not expire. It sits in that folder looking current for years after the product it describes has moved on.
So the check lands on the buyer. That is not fair. It is also just how the system works — and it takes ten minutes.
Four ways coverage quietly fails
1. The model is simply not on the list
The most common case by far, and usually not fraud. Just drift.
A factory certifies Q366, Q408, Q605. Two years later you order Q712. It is the same product family, same mould, same everything. But it is not on the certificate.
Nobody re-certified because nobody thought it mattered.
Check: find the model list in the certificate or its annex. Compare character by character against your quotation and your product label.
2. Same series, different plug
This one catches experienced buyers.
A power strip range uses the same housing across markets. But an EU version, a UK version and a US version are different products from a certification standpoint. Different plug. Different socket standard. Different test requirements.
The standards move with them. An EU version is assessed under EN 60884-1 for the socket-outlet and EN IEC 62368-1 for any USB circuitry. A UK version needs BS 1363. A US version is assessed under UL 1363 and UL 62368-1.
A certificate that lists the EU model does not cover the UK model, even though they came off the same moulding machine.
Check: the certificate must name the specific plug/socket configuration you are buying, not just the product family.
3. Something changed after certification
A certificate describes the product as it was tested. Then production moves on.
Common changes that quietly break coverage:
- A key component is re-sourced (fuse, X capacitor, transformer, PCB substrate)
- The enclosure is re-tooled, or the wall thickness changes
- A supplier switches resin to save cost
- The cord set comes from a different maker
None of these require the certificate holder to notify you. The document still says what it said.
Check: ask directly: "Has anything changed in this model since the certificate was issued?" Then ask for the test report's sample photos and compare them to production samples.
4. The ratings were widened on the packaging
Here is a real scenario that comes up again and again.
The test report covers model A at 220–240 V. The buyer wants to print 110–240 V on the carton, because it sells better in more regions.
Two separate problems:
- The model name changed to a buyer's own sales code. Customs sees a certificate for A covering a shipment of B. That reads as certificate misuse.
- The voltage range was widened. The product was never tested at 110 V. Printing a wider range claims a performance level that was never verified.
Under the LVD, that second point is a serious non-conformity — not a paperwork typo.
Check: the label, the carton, the manual and the test report must all carry the same model and the same ratings.
The private label problem
If you buy OEM and put your own brand on the box, the certificate holder is still the factory.
That is usually fine. Retailers and marketplaces accept it every day. But two things have to line up:
- ☐ The certificate holder's legal name must match the factory named in your supply chain documents
- ☐ Your branded model must be traceable to the certified model — often via a written confirmation from the certificate holder
If you sell under your own brand and your own model number, get that link in writing before production. A retailer compliance review will ask for it, and reconstructing it later is painful.
How to check in ten minutes
- Open the certificate or its annex. Find the model list.
- Search for your exact model number. Not a prefix. The full string.
- Cross-check three places: the certificate, your quotation, and the product label artwork.
- Compare the ratings. Voltage, current, frequency, output profile.
- Open the test report, not just the certificate. Look at the sample photos.
If any of the five fail, ask before the deposit. After production, your options shrink to re-tooling, re-testing, or eating the loss.
New test, variation assessment, or coverage letter?
| What changed | Usually needed |
|---|---|
| Only the model name / sales code | Updated certificate or annex listing the new model |
| Colour, non-safety trim, packaging | Documentation update; often no new testing |
| Enclosure material or wall thickness | Variation assessment (differences evaluation) by the lab |
| Key safety component re-sourced | Partial re-testing |
| Ratings widened (voltage, current, output) | Full re-test at the new ratings |
| Plug or socket configuration changed | New certification to the new plug standard |
The word "usually" matters. The certification body decides, not the factory and not the buyer.
FAQ
Can I use a certificate that covers a "series" if my model is not named?
No. Series coverage only extends to models listed in the certificate or its annex. Ask the holder to add your model — it is a normal, routine request.
The factory says the new model is identical except for colour. Is that enough?
Colour alone usually is not a safety-relevant change. But "identical except for colour" needs to be confirmed by the certification body, not asserted by the salesperson. Ask for the written confirmation.
We private label. The certificate is in the factory's name. Is that acceptable?
Usually yes, provided the certificate holder, the factory and your supply documents are consistent, and your branded model can be traced to the certified model in writing.