When an automatic transfer switch supplier sends an IEC, CE, CB or UL document, the important procurement question is not simply whether the file looks official. The buyer needs to confirm whether that document actually applies to the ATS model, electrical configuration, brand and target market in the purchase order.
This guide is written for importers, distributors, panel builders, generator-set integrators, engineering procurement teams and OEM/private-label buyers reviewing automatic transfer switch certificates and compliance documents before sample approval or bulk purchasing.
Check six items before accepting ATS compliance evidence: the applicable market or project requirement, document type, covered model or product family, electrical rating scope, manufacturer or brand identity, and consistency between the certificate, test evidence, datasheet, manual, physical product label and purchase specification.
A document can be genuine and still be the wrong document for the ATS you are buying.
Table of Contents
Start With the Exact ATS You Are Buying
For the LEEYEE ATS discussed in this guide, the physical product provides several useful identification clues before certificate review begins. The visible front marking reads ATS-4P63, and the terminal arrangement shows a four-pole configuration with neutral and three phase conductors for each source and the load.
The front interface also shows automatic/manual control and source markings for generator and grid applications. These visible details help identify the product, but they do not prove every electrical rating, test result or certification claim.
| Visible on the Product | What It Helps Confirm | What Still Needs Documentation |
|---|---|---|
| ATS-4P63 model marking | Provides a product identifier to compare with datasheets, reports and purchase documents. | Do not infer rated current or certification scope from the model code alone. |
| 4-pole terminal arrangement | Provides a physical configuration reference for document comparison. | Confirm the exact pole configuration stated in the datasheet and applicable test or certification documents. |
| A / B source terminals | Shows two power-source connections and a common load side. | Confirm system voltage, source requirements and installation conditions from official documentation. |
| Auto / Manual controls | Shows that the unit includes automatic and manual operating interfaces. | Confirm the actual transfer logic, operating conditions and controller functions from the product manual. |
Buyer rule: use visible product information as a starting point for verification, not as a substitute for the datasheet, test evidence or certificate scope.
How Should a Buyer Check an ATS Certificate?
Start with the exact product you intend to buy, not with a certification logo. A useful ATS certificate review should connect the product identification and ordered configuration to traceable conformity or technical evidence.
| Check | What the Buyer Should Confirm | Typical Risk |
|---|---|---|
| Market / project | Which standard, certification or regulatory framework does the destination market, consultant or tender require? | Using IEC-based evidence for a project that specifically requires UL certification, or the reverse. |
| Document type | Is the file a certificate, test report, EU Declaration of Conformity, official certification record or supplier declaration? | Treating different document types as if they prove the same thing. |
| Model scope | Does ATS-4P63 appear directly, or can the supplier demonstrate that it is included in the documented product family? | A document for another ATS configuration is assumed to cover the ordered product. |
| Rating scope | Are the ordered voltage, pole arrangement and other relevant declared ratings within the documented scope? | A valid document is applied to an unverified configuration. |
| Identity | Do the manufacturer, trade name and any OEM/private-label arrangement correspond to the supplied product? | The physical product and conformity record refer to different identities. |
| Consistency | Do the certificate, report, datasheet, manual, product label and PO describe one consistent ATS configuration? | Individual files appear reasonable, but the complete technical package does not match. |
IEC, UL, CE and CB Do Not Mean the Same Thing
IEC, CE, CB and UL information often appears together in electrical-equipment documentation, but they should not be treated as four interchangeable certificates. They have different roles in standards, regulatory conformity and third-party certification.
| Term | What It Means | What Buyers Should Verify |
|---|---|---|
| IEC 60947-6-1 | International product standard for transfer switching equipment, including automatic transfer switching equipment. | Check the standard edition and whether the exact ATS product is covered by the relevant technical evidence. [1] |
| UL 1008 | UL standard covering transfer switch equipment, including automatic transfer switches. | Where UL certification is required, verify the exact certified product through the applicable UL record. [2] [3] |
| CE marking | EU conformity marking used where applicable EU legislation requires it; it is not simply a generic third-party product certificate. | Check the applicable EU Declaration of Conformity, product identity, legislation and supporting documentation. [4] [5] |
| IECEE CB Scheme | International conformity-assessment system based on mutual acceptance of test reports and certificates for electrotechnical equipment. | If a CB Test Certificate is supplied, verify its record, standard, model and scope. [6] [7] |
Buyer meaning: instead of asking only “Do you have IEC, CE, CB or UL?”, ask which exact document applies to ATS-4P63 and whether that document covers the configuration you intend to purchase.
Which IEC Standard Is Relevant to an ATS?
IEC 60947-6-1:2026 is the current fourth edition of the IEC standard for transfer switching equipment. It was published on 2 April 2026 and replaced the 2021 third edition. The standard covers transfer switching equipment, including automatic transfer switching equipment. [1]
IEC 60947-6-1:2026 applies to TSE with rated voltages not exceeding 1,000 V AC or 1,500 V DC. It also contains requirements for several specialised transfer-switch configurations. [1]
Product-scope warning: the fact that IEC 60947-6-1 covers configurations such as closed-transition equipment, bypass/isolation TSE or stand-alone ATS controllers does not mean the LEEYEE ATS-4P63 provides those functions. Only claim functions that are confirmed by the actual product datasheet and manual.
Buyers may also see TSE and ATSE terminology in IEC documentation. TSE means transfer switching equipment, while ATSE refers to automatic transfer switching equipment.
Do not automatically reject an older certificate because a new IEC edition has been published. Certificate validity, transition rules and any reassessment requirement depend on the certification scheme, issuing body and project requirements. Confirm the actual status of the document instead of assuming that every certificate referencing an older edition became invalid immediately.
What Should Buyers Check for UL 1008?
UL Standards & Engagement lists UL 1008, Transfer Switch Equipment, Edition 9 as an active standard. Its scope includes automatic transfer switches and other defined transfer-switch equipment. [2]
If a project specification requires a UL Certified ATS, an IEC 60947-6-1 test statement does not by itself demonstrate UL certification. Likewise, a UL certification record should not be treated as a substitute for IEC-based documentation where an IEC-based project specifically requires it.
When a supplier claims UL certification, buyers can use UL Product iQ to verify the available certification information. [3]
Important for this product: this article explains how to check a UL 1008 claim. It does not by itself state that the LEEYEE ATS-4P63 is UL 1008 certified. Model-specific certification must be confirmed from the actual certification record.
What Does CE Marking Mean for an ATS Buyer?
CE marking should not be treated as a universal third-party “CE certificate.” The European Commission states that the manufacturer is responsible for carrying out the required conformity assessment, preparing technical documentation, issuing the EU Declaration of Conformity and affixing CE marking where applicable. [4]
For electrical equipment within the scope of Directive 2014/35/EU, the EU Declaration of Conformity must identify the electrical equipment and state the applicable Union harmonisation legislation and standards or technical specifications used. [5]
Other EU legislation may also apply depending on the product design and functions. Confirm the requirements for the exact ATS and destination market instead of assuming that one generic document covers every EU obligation.
EU procurement check: do not stop after receiving a file titled “CE Certificate.” Ask for the applicable EU Declaration of Conformity and confirm that the product identification corresponds to the ATS being supplied.
What Does an IECEE CB Test Certificate Prove?
The IECEE CB Scheme is an international conformity-assessment system based on mutual acceptance of test reports and certificates for electrotechnical equipment and components. [6]
If a supplier presents a CB Test Certificate for an ATS, use the official IECEE Certificates database where applicable and compare the certificate information, referenced standard, model and documented scope with the actual order. [7]
Do not assume that every ATS evaluated against IEC 60947-6-1 must have an IECEE CB Test Certificate. CB documentation must be confirmed for the exact product and certification route.
Does the Certificate Cover LEEYEE ATS-4P63?
For this product, the correct verification question is not “Does LEEYEE have an ATS certificate?” It is:
“Does the certificate or report actually cover ATS-4P63 and the exact configuration in my order?”
| Item | What to Check for ATS-4P63 | Do Not Assume |
|---|---|---|
| Model | Look for ATS-4P63 directly or require evidence showing how it belongs to the documented product family. | A similar-looking ATS automatically shares the same certificate. |
| Pole configuration | Confirm that the documented configuration covers the four-pole arrangement ordered. | Certification for another pole arrangement automatically covers this product. |
| Rated current | Use the official datasheet, nameplate and certification scope to confirm the rating. | The “63” in ATS-4P63 proves a 63 A certified rating unless the technical documents confirm it. |
| Rated voltage | Compare the actual product rating with the certificate, report, datasheet and project system voltage. | The physical appearance proves suitability for every system voltage. |
| Transfer functions | Confirm automatic/manual operation and any controller behaviour from the official manual and test evidence. | Functions covered by IEC 60947-6-1 generally are automatically present in this model. |
Procurement conclusion: use ATS-4P63 as the exact verification anchor. Do not build certificate conclusions from catalogue similarities or model-code assumptions.
Cross-Check the Certificate, Test Report, Datasheet and Product Label
For ATS-4P63, certificate verification becomes much stronger when every document is reviewed as part of one chain. The model identity and ordered configuration should remain consistent from technical approval through delivery.
- Certificate or conformity declaration Check whether ATS-4P63 or its documented product family is identified and whether the relevant standard or legislation is stated.
- Test report or technical evidence Confirm which product configuration, ratings and standard edition were evaluated where that information is available.
- Datasheet Use the official datasheet to confirm electrical ratings instead of inferring specifications from the model code.
- Installation and operating manual Confirm the actual source arrangement, operating logic, wiring requirements and limitations.
- Product label / nameplate Compare the physical product identity and electrical information with the approved documentation.
- Purchase order and approved sample Ensure the ATS released for bulk production is the same configuration that passed the buyer's technical review.
Engineering boundary: visible product markings are useful for traceability, but mandatory nameplate content and electrical ratings must be checked against the applicable standard, datasheet and certification documentation.
What Should Buyers Compare on the ATS Product Label?
| Product Information | Compare Against | Buyer Purpose |
|---|---|---|
| ATS-4P63 model identity | Datasheet, certificate/report scope and PO | Confirm that the delivered model is the approved model. |
| 4-pole configuration | Datasheet, wiring documentation and order | Confirm that the physical configuration matches project requirements. |
| Rated current | Official datasheet and applicable certification scope | Prevent rating assumptions based only on the model name. |
| Rated voltage | Datasheet, project requirement and technical evidence | Confirm suitability for the intended electrical system. |
| LEEYEE brand / manufacturer identity | Conformity or certification documentation | Maintain traceability between the product and its documents. |
| Certification markings, if applicable | Official certification record and programme rules | Confirm that a mark is authorised for the exact product. |
What Should Buyers Look for in the ATS Test Report?
Where a relevant report or report summary is available, confirm whether ATS-4P63 or its documented product family is connected to the evaluation. Check the referenced standard edition, configuration, electrical ratings, test conditions and any stated limitations.
Do not assume that every supplier must release a complete confidential laboratory report. Access may be restricted by the manufacturer, laboratory or certification body. The procurement objective is to obtain enough traceable evidence to show that the ordered ATS falls within the applicable scope.
What If the Certificate Uses an Older Standard Edition?
Existing ATS documentation may still reference IEC 60947-6-1:2021 even though IEC 60947-6-1:2026 is now the current edition. [1]
- Do not assume every older document became invalid immediately after publication of the new edition.
- Do not assume an older document is automatically acceptable for a new project without checking its status and the project specification.
Confirm certificate status with the issuing or certification body where appropriate, ask whether transition or reassessment requirements apply, and verify which standard edition the project requires.
How Should OEM and Private-Label ATS Certification Be Handled?
OEM/private-label purchasing requires another layer of verification because ATS-4P63 may be requested with a buyer's brand, model reference, packaging or product-label artwork.
A logo change should not automatically be treated as only a printing change. Its compliance impact depends on the certification and regulatory framework involved.
EU Private-Label Orders
The European Commission states that an importer or distributor placing a product on the market under its own name takes over the manufacturer's responsibilities. [8]
For an EU private-label order, confirm the responsible economic operator, product identity, EU Declaration of Conformity, technical documentation and final label arrangement before mass production.
UL-Certified Private-Label Products
UL Solutions operates a Multiple Listing Service for eligible identical UL Certified products marketed under different brand names. The applicability of that programme and exact marking arrangement must be confirmed for the specific product. [9]
Do not copy a UL Certification Mark onto OEM artwork unless the applicable certification and marking arrangement has been formally confirmed. [10]
OEM buyer rule: confirm certification, product identity and responsibility before approving final artwork. A brand or model-number change can become a compliance issue rather than only a packaging issue.
Common Red Flags When Reviewing ATS Certificates
- The supplier provides only a cropped certificate image or logo with no traceable document information.
- The document shows another model or product family and no evidence connects it to ATS-4P63.
- The pole configuration, voltage, current or model information conflicts across the product, datasheet and technical files.
- The supplier says “IEC certified” but cannot identify the relevant standard, certificate or evaluation evidence.
- An EU-bound order is supported only by a file titled “CE Certificate,” while the applicable EU Declaration of Conformity cannot be provided.
- Electrical ratings are inferred from the ATS-4P63 model name rather than confirmed from official technical documents.
- The OEM label changes the brand or model identity without explaining the conformity or certification arrangement.
- A claimed UL certification cannot be reconciled with available official Product iQ information.
What Documents Should Buyers Request Before Ordering ATS-4P63?
ATS Procurement Document Checklist
- Official ATS-4P63 datasheet.
- Applicable product standard and edition.
- Applicable certificate, conformity declaration or official certification record.
- Relevant test-report reference or technical evidence available for buyer review.
- Documentation showing that ATS-4P63 is within the applicable model scope.
- Installation and operating manual.
- Wiring diagram for the actual ordered configuration.
- Product label or nameplate information.
- OEM/private-label model and brand mapping where applicable.
- Approved sample or pre-production configuration for comparison with the final purchase order.
The buyer should also tell the supplier the destination market, project requirements, system voltage, required pole arrangement, quantity and OEM/private-label requirements.
This produces a much more useful technical response than asking only, “What ATS certificates do you have?”
A Practical ATS-4P63 Document Approval Workflow
- Define the destination market and project requirement Confirm the required standard, regulatory framework and project acceptance criteria.
- Confirm the exact proposed product Use ATS-4P63 and the actual ordered pole, voltage and application requirements as the verification anchor.
- Request the document package Obtain the applicable certification/conformity documents, technical evidence, datasheet, manual and label information.
- Verify official records where available Use official certification-body or scheme databases when UL, CB or other third-party certification is claimed.
- Cross-check product identity and ratings Make sure the model and electrical configuration remain consistent across all documents.
- Approve OEM artwork after compliance review Confirm brand, model mapping and certification-mark use before mass production.
- Keep the approved document set Use it as the reference for incoming inspection, later batches and project documentation.
Important product boundary: this guide discusses IEC, CE, CB and UL verification because buyers may encounter these requirements in different projects. It does not mean that LEEYEE ATS-4P63 carries every certification discussed on this page. Certification, ratings and document availability must be confirmed from the actual model-specific technical files before project submission or order approval.
Request ATS-4P63 Document Verification
Send the target market, required standard or certification, system voltage, project application, quantity and OEM-label requirement. LEEYEE can confirm which available technical and conformity documents apply to the proposed ATS-4P63 order.
Frequently Asked Questions
Does ATS-4P63 automatically mean the product is rated 63 A?
Do not determine the certified electrical rating from the model code alone. Confirm the actual rated current from the official LEEYEE datasheet, product marking and applicable certificate or test documentation.
Is IEC 60947-6-1 an ATS certificate?
No. IEC 60947-6-1 is an international product standard for transfer switching equipment. A certificate, test report or conformity document may reference the standard, but the standard itself is not a product certificate. [1]
What is the current IEC 60947-6-1 edition?
IEC 60947-6-1:2026, Edition 4.0, was published on 2 April 2026 and replaced the 2021 edition. Older documents should be checked for their current status and project acceptability rather than automatically accepted or rejected. [1]
Does this article mean LEEYEE ATS-4P63 is UL 1008 certified?
No. This article explains how buyers should verify a UL 1008 certification claim when a project requires one. Certification of ATS-4P63 must be confirmed from the actual model-specific UL certification record, if applicable.
Is CE marking the same as a third-party ATS certificate?
No. CE marking forms part of the EU conformity framework. Buyers should review the applicable EU Declaration of Conformity and supporting technical documentation for the exact product. [4]
Can a certificate for another ATS model be used for ATS-4P63?
Only if the certification or technical documentation clearly demonstrates that ATS-4P63 is included within the covered product family or scope. Visual similarity alone is not sufficient.
How can I verify a claimed UL certification?
Use UL Product iQ and compare the available certification information with the manufacturer, file number, model or other identifiers supplied for the product. [3]
How can I verify an IECEE CB Test Certificate?
If a supplier presents a CB Test Certificate, use the official IECEE Certificates database and compare the certificate information, referenced standard and product identity with the ordered ATS. [7]
Can an OEM buyer put its own brand on ATS-4P63?
OEM branding may be possible, but certification, regulatory responsibility, product identification and marking rules must be reviewed before final artwork is approved. Do not assume that changing the logo has no compliance effect.
What is the most important check before a bulk ATS order?
Confirm that the product model, datasheet, applicable certificate or conformity evidence, test information, manual, product label and purchase specification all refer to the same approved configuration.
References
- International Electrotechnical Commission (IEC), IEC 60947-6-1:2026 — Low-voltage switchgear and controlgear – Part 6-1: Multiple function equipment – Transfer switching equipment, Edition 4.0, published 2 April 2026.
- UL Standards & Engagement, UL 1008 — Transfer Switch Equipment, Edition 9.
- UL Solutions, Product iQ Product Sourcing and Certifications Database, official UL certification-information search resource.
- European Commission, CE Marking — Manufacturers, manufacturer responsibilities for conformity assessment, technical documentation, EU Declaration of Conformity and CE marking.
- European Union, Directive 2014/35/EU — Low Voltage Directive.
- IECEE, IECEE CB Scheme, international conformity-assessment framework for electrotechnical equipment and components.
- IECEE, IECEE Certificates Database, official certificate verification resource.
- European Commission, CE Marking — Importers and Distributors, including responsibilities when a product is marketed under an importer's or distributor's own name.
- UL Solutions, Multiple Listing Service for UL Certified Products.
- UL Solutions, Authorized Label Supplier Program for UL Marks.
