Quali documenti richiedere a un produttore di SPD? Una checklist per l'acquirente

La scheda tecnica di un dispositivo di protezione contro le sovratensioni (SPD) può mostrare valori impressionanti, ma come si può verificare che il prodotto soddisfi effettivamente i requisiti del proprio progetto?

Per distributori elettrici, importatori, produttori OEM e appaltatori EPC solari, la scelta di un fornitore di SPD comporta più del semplice confronto dei prezzi o delle correnti di scarica nominali.

Un fornitore può proporre un SPD di Tipo 2 con una corrente di scarica massima di 40 kA. Un altro può fornire un documento relativo alla marcatura CE, un rapporto di prova o un certificato ISO 9001.

Ma questi documenti non provano tutti la stessa cosa.

Un rapporto di prova può riferirsi a un modello diverso. Un certificato può coprire solo determinate configurazioni. Una scheda tecnica può omettere requisiti critici di installazione.

La domanda più importante non è quanti documenti un produttore di SPD può fornire, ma se tali documenti dimostrano che il prodotto esatto è adatto alla propria applicazione.

Questa guida spiega nove documenti essenziali del produttore di SPD, come verificarne il contenuto e cosa la documentazione reale del produttore può insegnare agli acquirenti prima di effettuare un ordine.

Risposta rapida: Quali documenti dovresti richiedere a un produttore di SPD?

Come minimo, gli acquirenti dovrebbero ottenere una scheda tecnica specifica per modello, prove di test applicabili e istruzioni di installazione. Dichiarazioni, certificazioni, registri di qualità e documenti commerciali aggiuntivi dipendono dal prodotto, dal mercato di destinazione e dai requisiti di acquisto.

Tabella 1. Elenco di controllo della documentazione del produttore di SPD

Documento	Scopo principale	Quando richiedere
Scheda tecnica del prodotto	Confermare tensione, tipo di SPD, valori nominali di scarica e modello	Prima dell'approvazione del preventivo
Rapporto di prova IEC/EN o applicabile	Revisione delle prove di supporto relative a prestazioni e sicurezza	Prima dell'approvazione tecnica
Dichiarazione di conformità	Verifica della conformità dichiarata alle normative applicabili	Ove richiesto per il mercato di destinazione
Certificazione di terze parti	Verifica della certificazione indipendente e dei modelli coperti	Ove disponibile o richiesto
Manuale di installazione	Verificare cablaggio, protezione di backup e condizioni di installazione	Prima dell'installazione del campione
Disegni meccanici	Confermare la compatibilità fisica e di montaggio	Prima dell'approvazione del progetto del pannello
Registri di ispezione di qualità di fabbrica	Valutare la coerenza della produzione	Prima della produzione di massa
Tracciabilità del prodotto e garanzia	Identificare i lotti e le responsabilità post-vendita	Prima dell'ordine di acquisto
Documenti commerciali e di spedizione	Confermare la spedizione, la quantità e le informazioni sull'importazione	Durante l'ordine e la spedizione

Non tutti gli acquirenti necessitano di tutti i documenti.

Ad esempio, un distributore elettrico europeo potrebbe dare priorità a una Dichiarazione di Conformità UE, mentre un appaltatore EPC solare potrebbe porre maggiore enfasi su prove specifiche per il fotovoltaico e sui requisiti di installazione.

Le sezioni seguenti spiegano come decidere.

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1. Scheda Tecnica del Prodotto: Verificare le Valutazioni Effettive dell'SPD

Una scheda tecnica è il punto di partenza per ogni decisione di acquisto di un SPD.

Tuttavia, una buona scheda tecnica dovrebbe fare più che visualizzare alcune specifiche interessanti.

Dovrebbe fornire informazioni sufficienti per valutare se il dispositivo è appropriato per il sistema elettrico in cui verrà installato.

Tabella 2. Parametri Essenziali della Scheda Tecnica dell'SPD

Parametro	Significato	Cosa dovrebbero verificare gli acquirenti
Uc	Tensione massima di funzionamento continuo	Adatto per l'impianto elettrico
Ucpv	Tensione operativa continua massima per un SPD fotovoltaico	Suitable for maximum PV array voltage
In	Corrente nominale di scarica	Declared value and test waveform
Imax	Corrente massima di scarica	Applicable Type 2 impulse rating
Iimp	Impulse discharge current	Type 1 capability where applicable
Su	Livello di protezione contro le sovratensioni	Appropriate for equipment protection
Isccr / SCCR	Short-circuit current rating	Matches prospective fault conditions
Iscpv	PV short-circuit current characteristic	Appropriate for the PV application
Protection modes	Protected conductor combinations	Compatible with system topology
Remote signaling	Status monitoring capability	Terminal arrangement and contact ratings

Not all parameters apply to every SPD.

A Type 2 AC SPD and a Type 1+2 photovoltaic DC SPD can require different technical information.

Buyers should therefore avoid evaluating all SPDs with a single generic parameter checklist.

For a deeper explanation of installation and voltage requirements, see our guide to solar inverter built-in and external SPDs.

Real Product Example: Phoenix Contact Type 2 SPD

Phoenix Contact publishes a detailed technical specification for its VAL-MS 230/3+1 FM/32, order number 2908476.

Its publicly listed characteristics include:

Table 3. Published Phoenix Contact SPD Data

Parametro	Published value
Prodotto	VAL-MS 230/3+1 FM/32
Order number	2908476
Tipo SPD	Tipo 2
Tensione nominale del sistema	240/415 V CA
Uc, L-N	275 V CA
In (8/20 µs)	20 kA
Imax (8/20 µs)	40 kA
Up, L-N	≤ 1.35 kV
Up, L-PE	≤ 1.6 kV
Short-circuit current rating	25 kA

Fonte: Phoenix Contact — VAL-MS 230/3+1 FM/32 Official Product Data

What makes this example useful?

The manufacturer does not describe the product simply as a “40 kA SPD.”

It publishes voltage characteristics, separate protection-mode values, electrical system compatibility, and short-circuit information.

These details matter when engineers compare products.

Buyer’s lesson: Two SPDs with the same Imax value may have different protection levels, operating voltages, protection modes, and short-circuit ratings.

A purchasing decision based only on “20 kA” or “40 kA” is incomplete.

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2. Test Reports: Verify the Applicable IEC Standard

An SPD test report provides evidence concerning the performance and safety evaluation of a tested product.

However, an IEC reference on a document does not automatically mean that the product has been independently certified.

The first step is identifying which standard applies.

Table 4. Important IEC Standards for SPD Buyers

Standard	Applicazione	Important scope information
IEC 61643-01:2024	General SPD requirements	Common requirements and test methods
IEC 61643-11:2025	AC low-voltage power SPDs	AC circuits rated up to 1,000 V RMS
IEC 61643-31:2018	Photovoltaic DC SPDs	DC side of PV installations up to 1,500 V DC

Official references:

• IEC 61643-11:2025 — AC Low-Voltage SPDs
• IEC 61643-31:2018 — PV Surge Protective Devices

IEC 61643-11:2025 was published on June 18, 2025, and includes revised requirements relating to AC SPD performance and safety testing.

IEC 61643-31:2018 specifically addresses SPDs intended for the DC side of photovoltaic installations up to 1,500 V DC.

These are different application categories.

Why Does the Standard Matter?

Consider a buyer sourcing a 1,500 V DC SPD for a utility-scale solar project.

The supplier presents a test report referring only to IEC 61643-11.

Should the buyer accept it?

Not without further clarification.

IEC 61643-11 addresses AC low-voltage power systems, while IEC 61643-31 provides the photovoltaic DC-specific requirements.

A supplier may have additional relevant testing documentation, but the buyer should confirm the applicable assessment for the offered PV model.

Table 5. Test Report Verification Checklist

Checkpoint	Acceptable evidence	Warning sign
Model number	Offered model is covered	Only another product is listed
Standard	Relevant standard and edition	Incorrect application standard
Laboratory	Identifiable testing organization	Laboratory details missing
Report number	Traceable report identifier	Incomplete or untraceable reference
Ratings	Consistent with product datasheet	Different voltage or current values
Model family	Documented scope or annex	Coverage is only assumed
Test results	Relevant evaluation results provided	Only a cover page is supplied
Report limitations	Conditions and exclusions are understood	Important annexes are missing

Importante: A report issued under an older edition is not automatically invalid. Buyers should check the accepted edition for their destination market, customer specification, and certification arrangement.

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3. CE Marking and Declaration of Conformity: Know the Difference

One of the most common problems in international electrical product procurement is confusion over CE documentation.

Some buyers request a “CE certificate” without specifying which document they actually need.

However, CE marking, an EU Declaration of Conformity, and independent third-party certification are not interchangeable.

Real Regulatory Example: European Commission Guidance

The European Commission explains that the manufacturer is responsible for conformity assessment, preparing technical documentation, issuing the EU Declaration of Conformity, and applying CE marking where applicable.

CE marking itself does not indicate that an EU authority has approved the product.

Fonte: European Commission — CE Marking and Manufacturer Responsibilities

Table 6. CE Marking vs DoC vs Third-Party Certification

Document or marking	Who is responsible?	What it demonstrates
Marchio CE	Produttore	Manufacturer’s declaration of conformity with applicable EU requirements
EU Declaration of Conformity	Manufacturer or responsible authorized party	Formal declaration identifying applicable EU legislation
Supporting technical file	Produttore	Evidence supporting the conformity assessment
Third-party product certificate	Relevant certification organization	Certification within the specific scheme and product scope
ISO 9001 certificate	Quality management certification body	Quality management system certification, not individual SPD product compliance

A product marked CE should not automatically be described as “EU-certified.”

Similarly, ISO 9001 does not establish that an individual SPD model meets IEC 61643 requirements.

What Should Buyers Check on an EU DoC?

Review the product identification, manufacturer details, relevant EU legislation, applicable standards or technical specifications, issue information, and signature.

For European shipments, the documents and responsibilities must meet the legal requirements applying to the product and market.

A generic certificate cannot replace these obligations.

Practical recommendation: Ask the supplier for the Declaration of Conformity applicable to the exact product rather than relying on a CE logo printed on its packaging.

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4. Third-Party Certificates: Check the Model, Not Just the Brand

Independent certification can be valuable, particularly for regulated markets or projects with strict technical approval procedures.

Buyers may encounter IECEE CB Scheme documents, UL certification records, TÜV-issued certificates, and national product approvals.

However, the relevant certification depends on the applicable market and scheme.

Table 7. Third-Party Certification Review

Articolo	What to verify	Perché è importante
Certificate number	Officially traceable	Helps establish authenticity
Certificate holder	Identified legal entity	May differ from the trading company
Produttore	Actual product manufacturer	Confirms manufacturing relationship
Factory location	Covered production location	Important for certain certification schemes
Product model	Exact model or listed family	Prevents unsupported model claims
Standard	Applicable technical requirements	Confirms relevance
Certificate status	Current status and restrictions	Certification scope can change
Annexes	Covered variants and ratings	Important for multipole and OEM models

Real Verification Example: UL Product iQ

UL Solutions provides Product iQ, an official database for searching UL certification information.

Users can search using information such as a file number, product category, or other product identifiers.

Official source: UL Solutions — Product iQ Certification Database

For example, a buyer receiving a claimed UL certification can check whether the relevant product or component appears within the applicable UL certification records.

The buyer should also check the covered models and product category rather than assuming certification applies to the entire manufacturer’s catalog.

Buyer’s lesson: A certificate from a recognized organization is valuable only when its scope applies to the product being purchased.

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5. Installation Instructions: Check More Than the Wiring Diagram

An SPD can have suitable electrical ratings and still be inappropriate for a particular installation if its connection and protection requirements are not followed.

A complete installation guide helps electrical engineers verify the correct arrangement.

Table 8. Installation Documents Buyers Should Review

Installation information	Perché è importante
Connection diagram	Confirms the correct electrical arrangement
Earthing and protection modes	Supports proper surge diversion paths
Backup fuse or circuit breaker	Ensures protective-device coordination
Maximum upstream protection	Helps determine whether additional protection is required
Short-circuit conditions	Helps assess suitability for available fault current
Coppia terminale	Supports proper electrical connections
Sezione del conduttore	Helps confirm compatible wiring
Mechanical mounting	Prevents panel assembly conflicts
Status indication	Supports maintenance and replacement decisions
Remote signaling contacts	Supports external alarm or monitoring integration

Real Manufacturer Example: DEHN Technical Data

DEHN’s published documentation for its DEHNguard M TNS ACI 275 FM, part number 952 440, identifies several important characteristics.

Table 9. Published DEHN SPD Example

Parametro	Published value
Modello	DG M TNS ACI 275 FM
Part number	952 440
Tipo SPD	Tipo 2
Uc (L-PE)	275 V CA
In (8/20 µs)	20 kA
Up (L-PE)	≤ 1,5 kV
Additional external fuse	Non richiesto

Fonte: DEHN — DEHNguard ACI Product Technical Documentation (PDF)

This example illustrates an important purchasing consideration.

Not every SPD requires a separate external backup fuse.

The correct protection arrangement depends on the specific product design, tested configuration, and manufacturer instructions.

A buyer should therefore never select backup protection simply because another Type 2 SPD uses a particular fuse rating.

For further technical guidance, read our SPD backup fuse and circuit breaker selection guide.

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6. Technical Drawings: Avoid Mechanical Compatibility Problems

For panel builders and OEM customers, mechanical compatibility can be as important as electrical performance.

An SPD may satisfy the required electrical specifications but still cause problems during panel assembly.

For example, an alternative model may occupy a different DIN-rail width or use a different terminal arrangement.

Technical Drawing Requirements

Document detail	Applicazione
Overall dimensions	Enclosure layout
Montaggio su guida DIN	Mechanical compatibility
Terminal positions	Passaggio dei cavi
Required clearances	Installation planning
Module width	Panel space calculation
Remote contact location	Monitoring wiring
Replaceable module structure	Maintenance planning

Buyers should also confirm whether the product delivered during bulk production matches the approved sample and drawings.

This is particularly relevant for OEM distribution boards, PV combiner boxes, and standardized industrial control panels.

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7. Factory Quality Records: What Happens After Type Testing?

A type-test report provides evidence of a product design evaluated under specified conditions.

It does not automatically establish that every production unit has been manufactured without defects.

This is why factory quality management and traceability are important for larger procurement projects.

Table 10. Factory Quality Documents and Their Purpose

Documento	What buyers can learn
Incoming inspection records	How critical materials are checked
Routine inspection procedures	Which tests or checks occur during production
Final inspection records	How finished products are evaluated
Batch identification	Whether affected production lots can be traced
Nonconformity reports	How production defects are handled
Corrective-action records	Whether identified problems lead to improvements
Quality management certificate	Whether a documented management system is certified

The exact routine tests and acceptance criteria should be defined by the relevant product requirements and supplier’s quality procedures.

Buyers should avoid assuming that a factory holding ISO 9001 certification has automatically obtained product certification for every SPD it manufactures.

Practical Factory Audit Example

Suppose a distributor plans to purchase 5,000 SPDs under a private label.

Before approving mass production, the buyer could request:

• The approved model datasheet and label drawing.
• A production inspection plan.
• A sample batch inspection record.
• A method for linking production batches to finished products.
• A documented change-notification procedure.

This is an illustrative procurement scenario, not a claim about a particular manufacturer’s inspection results.

The objective is to verify whether the supplier can consistently manufacture the approved product.

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8. OEM and Private-Label Documentation: Does the Certificate Still Apply?

Private-label SPD procurement introduces additional documentation questions.

A distributor may purchase an existing SPD design under its own brand with a different printed model number.

However, a new logo does not automatically mean the branded version is independently certified.

Equally, the existence of an original manufacturer’s certificate does not automatically establish that every private-label variation is covered.

Table 11. OEM Documentation Risks

OEM change	What buyers should confirm
Brand name change	Relationship to the assessed product
Model number change	Documented model equivalence
Label redesign	Required technical and regulatory markings
Enclosure change	Whether existing assessment remains applicable
Internal component change	Whether additional technical evaluation is needed
Manufacturing location change	Whether certification or approval scope is affected
Wiring modification	Compatibility with original testing and installation instructions

Before approving an OEM order, request the approved product specification, label artwork, applicable test evidence, and written confirmation of any model-equivalence arrangement.

Where a third-party certification is claimed, confirm that the relevant certification scheme permits the proposed configuration and labeling.

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9. Commercial Documents: Ensure the Approved Product Is the Shipped Product

Technical approval should continue through the purchasing and shipping process.

A mismatch between the approved model and the commercial documents can create customs, project acceptance, or inventory problems.

Commercial Documentation Checklist

Documento	What to verify
Proforma Invoice	Approved model, quantity, price and trade terms
Commercial Invoice	Correct shipment details and product descriptions
Packing List	Package count, quantities, weights and dimensions
Certificate of Origin	Origin information when required
Bill of Lading / Air Waybill	Consistent shipment information
Inspection report	Agreed production or shipment checks
Warranty terms	Responsibility for eligible claims

A Certificate of Origin is a trade document. It does not establish an SPD’s electrical safety or performance.

Likewise, an inspection report covering packaging and quantity does not replace a laboratory test report.

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Real-World Evidence: What Three Official Sources Teach SPD Buyers

The following examples are drawn from public manufacturer and regulatory documents. They are not estimates of field failure rates or unverified customer stories.

Table 12. Evidence-Based SPD Purchasing Lessons

Official example	Verified information	Purchasing lesson
Phoenix Contact VAL-MS 230/3+1 FM/32	In 20 kA, Imax 40 kA, mode-specific Up values	Compare complete electrical characteristics, not one rating
DEHNguard M TNS ACI 275 FM	Manufacturer indicates no additional external fuse required	Installation requirements are model-specific
European Commission CE guidance	Manufacturer is responsible for EU conformity assessment and DoC	CE marking is not equivalent to independent product certification

These examples highlight three different areas of risk:

Technical risk: Selecting a product based on incomplete specifications.

Installation risk: Applying protection requirements from another SPD model.

Documentation risk: Misinterpreting what a compliance document actually proves.

Reliable SPD procurement should address all three.

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How to Audit an SPD Supplier in 7 Steps

The most efficient documentation process is to review information in stages, rather than requesting every possible file without a clear purpose.

Step 1: Define the Electrical Application

Identify the AC or DC system, maximum operating voltage, required SPD Type, installation location, and destination market.

Step 2: Request the Exact Datasheet

Confirm the quoted model and its electrical ratings.

Step 3: Review Applicable Test Evidence

Check the relevant standards, model coverage, test organization, and report details.

Step 4: Verify Regulatory Documents

Check declarations and certificates required for the intended market.

Step 5: Confirm Installation Compatibility

Review the manufacturer’s wiring, short-circuit, backup protection, terminal, and mounting requirements.

Step 6: Approve the Production Reference

For repeat or OEM orders, retain approved drawings, labels, specifications, and quality criteria.

Step 7: Check Documents Before Shipment

Confirm that invoices, packing lists, and product identification correspond to the approved order.

Table 13. Recommended Timing for SPD Document Requests

Purchasing stage	Documents to prioritize
Initial inquiry	Datasheet and model identification
Supplier comparison	Test evidence and relevant certifications
Technical approval	Installation manual and mechanical drawings
Valutazione del campione	Label, configuration and sample inspection
Purchase order	Warranty, traceability and approved specifications
Production	Agreed quality and inspection records
Shipment	Commercial Invoice, Packing List and transport documents

This staged approach can reduce unnecessary communication while keeping critical technical checks ahead of the purchase decision.

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Common SPD Documentation Red Flags

Not every missing document means a supplier is unreliable. Some reports may be confidential, market-specific, or held by an external certification body.

However, unresolved inconsistencies are a legitimate reason to delay technical approval.

Table 14. Warning Signs and Recommended Actions

Warning sign	Potential issue	Azione raccomandata
Certificate covers a different model	Unclear product coverage	Request scope or annex
Datasheet and label disagree	Specification inconsistency	Confirm approved revision
Only a CE logo is provided	Insufficient compliance information	Request applicable DoC
PV SPD has only AC evidence	Application mismatch	Request relevant PV test evidence
Certificate number cannot be verified	Authenticity or status uncertainty	Check with issuer
Installation guide omits protection requirements	Incomplete installation information	Request model-specific instructions
OEM model is absent from documents	Unclear branding relationship	Request equivalence evidence
No production traceability information	Difficult batch investigation	Agree on traceability process
Production differs from approved sample	Uncontrolled design change	Investigate before shipment

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Ready-to-Use Email: Request Documents From an SPD Manufacturer

Subject: Request for SPD Technical Documents and Model Verification

Hello,

We are reviewing surge protective devices for an upcoming project and would like to verify the technical documentation for your quoted models.

Could you please provide the following?

1. Complete product datasheets
2. Applicable IEC/EN test reports
3. Declaration of Conformity, where applicable
4. Available third-party certification information
5. Installation manuals and wiring diagrams
6. Mechanical dimension drawings
7. Quality inspection information
8. Warranty and product traceability details

Please confirm that the supplied documents cover the exact model numbers, voltage ratings, and configurations included in your quotation.

Thank you.

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Domande frequenti

What are the most important SPD manufacturer documents?

The essential starting documents are a model-specific datasheet, applicable test evidence, and installation instructions.

Additional documentation depends on the installation, destination market, project specification, and purchasing requirements.

Does an SPD need a CE certificate?

For products subject to applicable EU CE-marking legislation, the manufacturer must fulfill the relevant conformity requirements, including the applicable declaration and technical documentation obligations.

A separately marketed “CE certificate” is not necessarily a legally required or sufficient conformity document.

Is IEC 61643-11 suitable for photovoltaic DC SPDs?

IEC 61643-11 addresses AC low-voltage surge protective devices.

IEC 61643-31 is the relevant product standard for SPDs intended for the DC side of photovoltaic installations within its scope.

Is an ISO 9001 certificate enough to approve an SPD manufacturer?

No.

ISO 9001 concerns quality management systems and does not replace model-specific technical evaluation or product conformity evidence.

Can a single test report cover multiple SPD models?

Potentially, where the assessment or certification scope explicitly includes the relevant models and configurations.

Buyers should verify model-family coverage rather than assume it.

Should buyers request every test report before ordering samples?

Non necessariamente.

Start with the key documents needed for technical evaluation. More detailed evidence can be requested based on project requirements, order size, and supplier qualification procedures.

How can buyers verify an SPD certificate?

Check the issuing organization, certificate number, model coverage, applicable standard, and certification status. Use the certification body’s official records where available.

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Conclusion: Buy Verified Performance, Not Just Specifications

The most valuable SPD manufacturer documents are those that help buyers connect three things:

The actual product being offered.

The performance and compliance evidence supporting that product.

The installation and production conditions under which it will be used.

A complete supplier qualification process should evaluate product specifications, applicable testing, certification scope, installation compatibility, and manufacturing consistency.

The objective is not to collect the largest number of certificates.

It is to obtain the right evidence for the right SPD.

For buyers comparing Chinese SPD manufacturers, our guide to evaluating SPD suppliers in China provides additional supplier-selection considerations.

Looking for AC or DC Surge Protective Devices?

KUANGYA supplies surge protective devices and related low-voltage electrical protection products for international customers, distributors, and OEM projects.

Tell us your application, SPD Type, system voltage, destination market, and required specifications.

Our team can help discuss suitable products and the model-specific technical documentation available for review.

Visit KUANGYA — www.cnkuangya.com

Technical note: Standards, certification scopes, and regulatory requirements may change. Always verify the applicable editions and approval requirements for the intended market and exact product model.