DC 서지 보호 장치는 외관상 단순해 보일 수 있지만, 라벨에 인쇄된 표기에는 해당 SPD의 사용처와 성능에 관한 중요한 정보가 포함되어 있습니다.

1000V DC 태양광 SPD의 다음 예시를 고려하십시오:

Ucpv: 1000V DC
클래스 II
In: 20kA
Imax: 40kA
Up: 4.0kV
Iscpv: 10kA
-40°C ~ +85°C
실내용, IP20

숙련된 전기 엔지니어에게 이러한 약어는 익숙합니다.

하지만 구매자, 유통업체, 태양광 설치업체 또는 프로젝트 구매자에게는 쉽게 혼란을 줄 수 있습니다.

이것이 클래스 II 2등급 SPD를 의미합니까?

이것이 40kA Imax입니까? 20kA보다 자동으로 더 우수한가요?

왜 동일한 SPD에 두 가지가 모두 표시되나요? 1000V 및 4.0kV?

이것이 Iscpv 10kA SPD가 10kA의 낙뢰 서지를 방전할 수 있다는 의미인가요?

간단한 답변은 다음과 같습니다: 단일 수치 하나만으로는 SPD 전체를 설명할 수 없습니다.

DC SPD는 완전한 전기적 특성 세트로 해석해야 합니다. 서지 보호 장치를 처음 접하신다면, 먼저 다음을 이해해야 합니다. 태양광 PV 시스템에서 DC SPD가 작동하는 방식 이러한 사양을 더 쉽게 이해할 수 있습니다.

이 가이드는 해당 표시를 올바르게 읽는 방법을 설명하며, Class II 1000V DC SPD를 실용적인 예시로 사용합니다.

빠른 답변: 주요 DC SPD 사양은 무엇을 의미합니까?

기술적인 세부 사항을 살펴보기 전에 아래 표에서 간단한 개요를 확인하십시오.

가장 중요한 점은 다음과 같습니다:

DC SPD를 라벨에 인쇄된 가장 큰 kA 수치만으로 비교하지 마십시오.

예를 들어, Imax 40kA, In 20kA 및 Iscpv 10kA 모두 kA 단위를 사용하지만, 완전히 다른 특성을 설명합니다.

DC SPD 라벨을 읽는 더 나은 순서

구매자가 SPD 데이터시트를 처음 볼 때, 종종 가장 큰 숫자부터 확인하곤 합니다.

이는 대개 잘못된 접근 방식입니다.

더 유용한 읽기 순서는 다음과 같습니다:

1. 다음 용도로 설계되었는지 확인 PV DC
2. 확인 Ucpv
3. 확인 SPD 유형 / 테스트 등급
4. 확인 Up
5. 확인 In 및 Imax
6. 확인 Iscpv
7. 배선 및 보호 구성 상태를 점검하십시오.
8. 환경 등급 확인
9. 관련 표준 및 문서를 확인하십시오.

이 순서를 따르면 주요 서지 전류 수치를 비교하기 전에 부적합한 제품을 사전에 배제할 수 있습니다.

VIOX는 데이터시트 가이드에서 이와 유사한 “부적합 사양 우선 배제” 방식을 사용합니다. PV 애플리케이션의 경우 Ucpv 및 PV 단락 동작에 특별한 주의가 필요하므로 이러한 논리가 더욱 중요해집니다.

DC SPD에서 Class II란 무엇을 의미합니까?

예시 라벨에 표시된 첫 번째 표기 중 하나는 다음과 같습니다.

클래스 II

이것은 not 2등급 품질을 의미합니다.

Class I, Class II 및 Class III은 제품의 품질 등급이 아닌 표준화된 SPD 시험 분류를 의미합니다.

태양광(PV) 서지 보호 장치의 경우, Type 2 SPD는 다음 항목과 관련이 있습니다. Class II 시험.

이것이 바로 서로 다른 제조사나 데이터시트에서 다음과 같은 표기를 사용하는 이유입니다.

• 유형 2
• T2
• 클래스 II

이들은 기술적으로는 서로 다르지만 밀접하게 관련된 분류 및 시험 개념을 지칭합니다. “Type”과 “test class”는 단순히 동일한 용어의 다른 표기법이 아닙니다..

대부분의 구매자에게 실질적인 관계는 다음과 같이 이해될 수 있습니다.

본 문서의 예시의 경우:

Class II → Type 2 적용 방향

따라서 가장 중요한 전류 매개변수는 다음과 같습니다:

In = 20kA
Imax = 40kA

Class II가 Class I보다 성능이 떨어지나요?

아니요.

이는 서지 보호 장치(SPD)를 비교할 때 가장 흔한 오해 중 하나입니다.

Class I과 Class II라는 용어는 등급처럼 들릴 수 있습니다:

Class I = 더 우수함
Class II = 더 저렴하거나 성능이 낮음

SPD 분류는 그런 식으로 작동하지 않습니다.

이것들은 다음을 위해 의도된 것입니다. 서로 다른 서지 조건.

Type 1 / Class I SPD는 낙뢰 임펄스 전류 용량에 대해 평가되며, 설치 지점에서 부분적인 낙뢰 전류를 처리해야 할 수 있습니다.

Type 2 / Class II SPD는 일반적으로 유도 낙뢰 효과 및 스위칭 이벤트로 인한 과도 과전압을 제한하는 데 사용됩니다.

따라서 올바른 질문은 다음과 같지 않습니다.

어떤 등급이 더 나은가요?

올바른 질문은 다음과 같습니다.

이 설치 지점에 필요한 SPD 유형은 무엇입니까?

Type 1 SPD가 모든 태양광(PV) 설치에 항상 올바른 선택인 것은 아니며, Type 1이 존재한다고 해서 Type 2 SPD가 무조건 부적합한 것도 아닙니다.

If you need a detailed explanation of this selection question, see our guide:

Type 1 vs Type 2 vs Type 1+2 DC SPD for Solar PV

Your existing article goes deeper into lightning exposure, installation location and when Type 1 capability should be evaluated.

Class I vs Class II DC SPD: What Is the Real Difference?

The biggest technical difference becomes clearer when we look at the test current.

Class I / Type 1

A Type 1 SPD is associated with an impulse-current rating:

Iimp

and a 10/350 μs current waveform is commonly associated with Class I testing.

The 10/350 μs waveform represents a much different current-energy duty than the 8/20 μs waveform used for Type 2 evaluation.

즉,

Iimp cannot be directly compared with Imax just because both are shown in kA.

예를 들어

Iimp = 12.5kA

및

Imax = 40kA

do not mean that the 40kA Type 2 product is “stronger.”

They refer to different test waveforms and different performance characteristics.

Class II / Type 2

A Type 2 SPD is mainly characterized using:

• In
• Imax
• Up
• Ucpv for PV applications

The 8/20 μs current waveform is associated with Class II discharge-current testing.

Type 2 DC SPDs are commonly evaluated for use in locations such as:

• PV 컴바이너 박스
• DC 분전반 장비
• 인버터 DC 입력
• other coordinated PV protection points

However, the final SPD type must still depend on the actual lightning protection design and installation conditions.

What About Class III?

Class III exists within general SPD classification, but it should not become the main subject when discussing typical PV DC SPD selection.

Class III protection is generally associated with coordinated fine protection close to sensitive equipment.

For solar PV DC protection, buyers will much more commonly encounter:

• Type 2 / Class II
• 유형 1
• 유형 1+2

That is why this article focuses mainly on Class II and its relationship with Type 2 DC SPDs, rather than treating Class I, II and III as three equally common PV product categories.

What Does Ucpv 1000V DC Mean?

The example label shows:

Ucpv: 1000V DC

Ucpv means:

Maximum Continuous Operating Voltage for PV Application

In simple terms:

Ucpv tells you the maximum DC voltage that may be continuously applied to the SPD’s mode of protection.

IEC 61643-32 defines Ucpv in essentially this way and states that it must be equal to or higher than the maximum PV open-circuit voltage condition relevant to the installation.

This makes Ucpv one of the first specifications that should be checked when selecting a solar DC SPD.

Does “1000V System” Automatically Mean You Need a 1000V SPD?

꼭 그렇지는 않습니다.

This is important.

A PV system should not be evaluated using only a convenient nominal label such as:

1000V solar system

The actual maximum DC voltage of a PV string depends on factors including:

• module open-circuit voltage, Voc
• number of modules connected in series
• minimum design temperature
• module voltage temperature coefficient

PV module open-circuit voltage normally increases when temperature falls.

For a broader explanation of PV array voltage, string design and related system requirements, see our IEC 62548 PV array design guide.

Therefore, the selection process should be based on the maximum calculated PV open-circuit voltage, rather than simply copying the nominal inverter or system voltage.

A simplified workflow is:

Module Voc

→ 직렬 모듈 수

→ Low-temperature correction

→ Maximum PV open-circuit voltage

→ Select suitable Ucpv

We have already covered this subject separately in our DC SPD Voltage Selection Guide, including 600V, 1000V and 1500V DC applications.

So in this article, the important point is simply:

Ucpv is a continuous-voltage compatibility rating, not a surge-current rating.

Ucpv Is Not the Same as Up

This is another common source of confusion.

Our example SPD shows:

Ucpv = 1000V DC

및

Up = 4.0kV

A buyer may reasonably ask:

Why does a 1000V SPD also have a 4kV voltage rating?

Because these two values describe different things.

So:

Ucpv is about surviving normal system operation.

Up is about limiting transient surge voltage.

They should never be treated as interchangeable voltage ratings.

What Does In 20kA Mean?

The label shows:

In: 20kA

In means:

공칭 방전 전류

For a Type 2 / Class II SPD, In is associated with an 8/20 μs current waveform.

In technical terms, it represents the crest value of the current through the SPD having the specified 8/20 μs waveshape under the relevant standardized test conditions.

That definition is accurate, but for a buyer it can be simplified:

In is one of the main ratings used to describe the tested surge-discharge performance of a Type 2 SPD.

For this product:

In = 20kA

The important word here is nominal.

It should not be confused with Imax.

What Does Imax 40kA Mean?

The same SPD also shows:

Imax: 40kA

Imax means:

최대 방전 전류

For a Type 2 SPD, Imax is also normally associated with the 8/20 μs current waveform.

It represents the manufacturer’s declared maximum discharge-current capability under the applicable test conditions.

따라서

In 20kA and Imax 40kA are not duplicate specifications.

They represent different test-duty levels.

In 20kA vs Imax 40kA: What Is the Difference?

This is one of the most important parts of the entire datasheet.

Consider the example:

A simple way to understand them is:

In = nominal discharge-current rating.

Imax = maximum declared discharge-current rating.

One common purchasing mistake is to look only at Imax because it is the larger number.

예를 들어

SPD A: In 20kA / Imax 40kA
SPD B: In 10kA / Imax 40kA

A buyer may see “40kA” on both products and assume that their surge performance is equivalent.

That conclusion is incomplete.

The full declared performance needs to be checked.

VIOX makes the same useful procurement distinction in its SPD datasheet guide: In and Imax should be read separately, and Imax should not be interpreted as the SPD’s normal repeated discharge capacity.

Does Higher Imax Always Mean a Better SPD?

아니요.

This is probably the most useful purchasing rule in this article:

The highest kA value does not automatically identify the best SPD.

Suppose two products are advertised as:

SPD A

• Ucpv: 1000V
• In: 20kA
• Imax: 40kA
• Up: 4.0kV

SPD B

• Ucpv: 1000V
• In: 20kA
• Imax: 60kA
• Up: different
• short-circuit rating: unknown

It would be incorrect to select SPD B immediately just because:

60kA > 40kA.

Other questions still matter:

• What is its Type / Class?
• What is In?
• What is Up?
• What is Ucpv?
• What is Iscpv?
• What protection mode is declared?
• What backup protection is required?
• Is it specifically tested for PV DC use?
• Does its documentation match the project requirement?

A larger number may be useful when the complete design calls for it.

But:

More kA is not a substitute for correct coordination.

Can a 40kA Type 2 SPD Replace a Type 1 SPD?

Not simply because it says 40kA.

This is another very common mistake.

A Type 2 product may show:

Imax = 40kA, 8/20 μs

while a Type 1 product may show:

Iimp = 12.5kA, 10/350 μs

Looking only at the peak current numbers:

40 > 12.5

may make the Type 2 SPD appear stronger.

But that comparison is technically incorrect.

The two values are based on different test waveforms and different protection duties.

따라서

Imax cannot be used as a substitute for a specified Iimp requirement.

If the project requires Type 1 lightning-current capability, a large Type 2 Imax value alone does not satisfy that requirement.

What Does Up 4.0kV Mean?

The example label shows:

Up: 4.0kV

Up means:

전압 보호 수준

It describes the SPD’s declared voltage-limiting performance under specified standardized test conditions.

In practical terms, Up helps answer the question:

How effectively does the SPD limit the transient voltage during the relevant test?

Generally, a lower Up can provide a lower level of surge voltage at the SPD terminals.

However, this needs an important qualification.

The printed Up value should not be treated as the exact maximum voltage that every connected inverter or device will experience in a real installation.

왜 그럴까요?

Because the actual voltage seen by the protected equipment can also be affected by:

• SPD connection lead length
• conductor routing
• inductance
• installation arrangement
• earthing and bonding
• distance between the SPD and equipment
• coordination with other SPDs

VIOX correctly makes the same distinction: the declared Up is established at the SPD under standardized conditions, while installation conductors can increase the voltage presented to the protected equipment.

Is Lower Up Always Better?

Not by itself.

It is reasonable to prefer effective voltage limitation, but the selection must remain compatible with the complete electrical system.

A low Up does not compensate for:

• insufficient Ucpv
• wrong SPD Type
• incorrect wiring
• poor earth connection
• unsuitable short-circuit characteristics
• excessively long leads
• incorrect coordination

So instead of saying:

“Always buy the SPD with the lowest Up.”

A more technically correct rule is:

Select an SPD with a suitable Up while also verifying Ucpv, SPD Type, protected equipment withstand level and installation coordination.

What Does Iscpv 10kA Mean?

Now we come to one of the most misunderstood PV-specific parameters:

Iscpv: 10kA

This is particularly important because it also uses the unit kA.

It is easy to look at:

In 20kA
Imax 40kA
Iscpv 10kA

and assume they are three levels of surge current.

그렇지 않습니다.

Iscpv means:

Short-Circuit Current Rating of the SPD for the PV application.

IEC terminology defines Iscpv as the maximum prospective short-circuit current from the power system for which the SPD, together with the specified disconnector, is rated.

A simpler explanation is:

Iscpv tells you whether the SPD and its specified disconnection arrangement are suitable for the prospective PV short-circuit current at the installation point.

This is a fault-current / short-circuit characteristic.

It is not a lightning-surge rating.

Iscpv 10kA Is Not the Same as Imax 10kA

This distinction deserves to be stated clearly:

Iscpv ≠ Imax

Even though both can be expressed in kA.

예를 들어

Imax

Describes surge discharge-current performance.

Iscpv

Describes the SPD’s PV short-circuit-current rating in conjunction with the specified disconnection arrangement.

So on our example product:

Imax = 40kA

does not mean:

PV short-circuit rating = 40kA.

And:

Iscpv = 10kA

does not mean:

The SPD can only discharge a 10kA surge.

These numbers belong to different electrical events.

Why Is Iscpv Especially Important for PV DC Systems?

PV DC circuits behave differently from ordinary AC circuits.

One important difference is that DC current does not naturally pass through zero every half-cycle as AC current does.

For protection devices, switching equipment and disconnecting arrangements, this makes DC fault interruption an important design consideration.

That is one reason PV-specific SPDs have characteristics and test requirements beyond simply printing:

“DC 1000V”

on an AC-style product.

IEC 61643-31 is specifically intended for SPDs connected to the DC side of photovoltaic installations and establishes PV-specific requirements, ratings and test methods.

Therefore, when buying a PV SPD, do not ask only:

“Is this 1000V DC?”

Also ask:

What is the declared Iscpv and required disconnection arrangement?

In, Imax, Iimp and Iscpv: Do Not Mix Them Up

The easiest way to remember these parameters is with this table:

Notice something important:

Three or four specifications can all contain:

kA

but this does not mean they can be compared directly.

Before comparing any two kA ratings, first ask:

1. What parameter is this?
2. What waveform is used?
3. What SPD Type is involved?
4. Is this a surge test or a short-circuit rating?

This prevents a large number of purchasing errors.

What Does “-40°C to +85°C” Mean?

The label also declares:

-40°C ~ +85°C

This is the manufacturer’s declared temperature range for the product.

Environmental ratings should not be ignored simply because electrical parameters look correct.

PV equipment may be installed in:

• rooftop combiner boxes
• inverter cabinets
• outdoor electrical enclosures
• industrial PV rooms
• high-temperature regions
• cold-weather installations

The internal temperature of an enclosure can be very different from the normal outdoor air temperature.

Therefore, project engineers should confirm that the SPD’s declared environmental conditions are suitable for the actual enclosure and installation environment.

What Does 5%–95% Mean?

Where the datasheet declares:

5%–95%

this normally represents the manufacturer’s declared relative humidity operating range.

However, humidity specifications should always be read together with conditions such as:

• condensation requirements
• enclosure protection
• 설치 위치
• temperature
• pollution conditions

The percentage alone does not mean that an exposed SPD can be installed directly in rain or other outdoor environments.

What Does Indoor Mean?

The label states:

실내용

This does not necessarily mean that the SPD can never form part of an outdoor PV installation.

It means the SPD itself is intended for a protected environment according to its declared construction and installation conditions.

For example, an indoor-rated SPD may be installed inside:

• a suitable outdoor PV combiner box
• an IP-rated enclosure
• an inverter cabinet
• a protected electrical cabinet

The important distinction is:

The SPD can be inside outdoor equipment without the SPD itself being directly exposed to outdoor conditions.

What Does IP20 Mean?

IP20 is the enclosure protection rating shown for the SPD itself.

It should not be interpreted as a weatherproof rating.

A DIN-rail SPD with IP20 is normally installed inside another suitable enclosure or cabinet.

For an outdoor PV installation, the final environmental protection depends on the complete enclosure, not only the bare SPD module.

So:

IP20 SPD inside a suitable outdoor enclosure

can be a normal arrangement.

But:

IP20 SPD directly exposed to rain, dust and outdoor weather

should not be assumed to be acceptable.

How Should You Read This 1000V DC SPD Label as a Whole?

Now we can return to the original example.

Ucpv: 1000V DC
클래스 II
In: 20kA
Imax: 40kA
Up: 4.0kV
Iscpv: 10kA

Instead of reading each number independently, read it as one technical description.

Ucpv 1000V DC

This tells us the declared maximum continuous PV operating voltage of the SPD.

클래스 II

This indicates Class II testing / Type 2 application direction.

In 20kA

This is the nominal discharge-current rating associated with the relevant Type 2 surge test.

Imax 40kA

This is the declared maximum discharge-current rating.

Up 4.0kV

This is the declared voltage protection level.

Iscpv 10kA

This is the PV short-circuit-current rating and must be understood together with the applicable disconnector/protection arrangement.

Now the label makes much more sense.

It is not saying:

“1000V, 20kA, 40kA, 10kA — bigger numbers are better.”

It is describing different electrical functions and limits of the same SPD.

6 Common Mistakes When Reading a DC SPD Datasheet

1. Treating Class II as a Quality Grade

Incorrect:

Class I is premium and Class II is lower quality.

Correct:

Class I and Class II represent different test/protection classifications.

2. Selecting an SPD Only by Imax

Incorrect:

This one says 60kA, so it is automatically better than the 40kA model.

Correct:

Check:

• 유형
• Ucpv
• In
• Imax
• Up
• Iscpv
• 표준
• wiring and protection requirements

before making the comparison.

3. Comparing Iimp Directly with Imax

Incorrect:

Imax 40kA is higher than Iimp 12.5kA, so Type 2 is stronger.

Correct:

Iimp and Imax refer to different test waveforms and different surge duties.

4. Confusing Ucpv with Up

Incorrect:

The SPD is rated 1000V but Up is 4kV, so the specifications conflict.

Correct:

Ucpv and Up describe different voltage characteristics.

5. Treating Iscpv as a Surge Rating

Incorrect:

Iscpv 10kA means the SPD can discharge 10kA of lightning current.

Correct:

Iscpv is a PV short-circuit-current rating.

6. Ignoring Installation Conditions

Even a correctly selected SPD can provide poor protection if installation is poor.

Important details include:

• 리드 길이
• conductor routing
• PE connection
• enclosure
• coordination
• backup protection
• distance from protected equipment

A datasheet tells you what the device is capable of under defined conditions.

Installation determines how effectively that capability is used in the real system.

The SPD should also be considered together with other solar PV electrical protection devices, including DC fuses, isolators, circuit breakers and the overall protection arrangement.

How to Check a DC SPD Before Buying

For buyers, distributors and EPC procurement teams, the following sequence is more useful than simply asking for:

“1000V 40kA SPD price.”

Step 1 — Confirm the Application

Is the product specifically intended for:

PV DC surge protection?

Do not assume an AC SPD with a similar voltage or current marking is interchangeable.

Step 2 — Check Maximum PV Voltage

Determine the maximum possible PV open-circuit voltage.

Then confirm that the selected Ucpv is suitable.

For the full calculation method, refer to the DC SPD Voltage Selection Guide mentioned earlier.

Step 3 — Confirm Type / Class

Determine whether the installation requires:

• 유형 2
• 유형 1
• 유형 1+2

Do not make this decision simply from product price or kA rating.

Our detailed Type 1 vs Type 2 vs Type 1+2 DC SPD guide explains this separately.

Step 4 — Check In and Imax

For a Type 2 / Class II SPD, confirm both values.

Do not check only Imax.

Step 5 — Check Up

Verify the declared voltage protection level and whether it is appropriate for the protected equipment and protection concept.

Step 6 — Check Iscpv

Confirm that the SPD and specified disconnection/protection arrangement are compatible with the prospective short-circuit current of the PV system.

Step 7 — Check Installation Configuration

Confirm:

• pole configuration
• DC+/DC− arrangement
• PE connection
• protection mode
• backup protection
• 배선 다이어그램

Step 8 — Check Environmental Conditions

확인합니다:

• temperature range
• humidity
• indoor/outdoor condition
• enclosure IP rating
• installation altitude where relevant

Step 9 — Verify the Standard and Documentation

For PV DC SPDs, IEC 61643-31 is an important product standard to check.

IEC 61643-31:2018 covers SPDs intended for the DC side of photovoltaic installations up to 1500V DC, while IEC 61643-32:2017 addresses their selection, installation and coordination.

Depending on the project and market, buyers may also need:

• 인증서
• test report
• datasheet
• 배선 다이어그램
• dimensional drawing
• declaration of conformity
• project-specific approvals

Do not assume that a logo printed on a product is sufficient evidence.

Match the documentation to the exact model being purchased.

DC SPD Specification Checklist

Before approving a PV SPD, use the following checklist.

Example: How a Buyer Should Request a 1000V DC SPD

A weak RFQ might say:

Please quote 1000V 40kA solar SPD.

This leaves many important questions unanswered.

A better RFQ is:

Please quote a Type 2 / Class II PV DC SPD for a 1000V DC application. Please confirm Ucpv, In, Imax, Up, Iscpv, pole configuration, required backup protection, IEC 61643-31 documentation and wiring diagram.

If known, also include:

• actual maximum string Voc
• 수량
• installation point
• system configuration
• minimum temperature
• enclosure/application
• OEM requirements

This allows the manufacturer to evaluate the complete requirement instead of matching only the words:

“1000V” and “40kA.”

자주 묻는 질문

Is Class II the Same as Type 2 SPD?

They are closely related but technically describe classification/testing from slightly different perspectives.

For practical PV product selection, a Type 2 SPD is associated with Class II 시험, which is why labels and datasheets may show Type 2, T2 or Class II terminology.

Is Class II SPD Lower Quality Than Class I?

아니요.

Class I and Class II are not quality levels.

They are intended for different surge-protection duties and test conditions.

What Is the Difference Between In and Imax?

In is the nominal discharge current.

Imax is the maximum discharge current.

For Type 2 SPDs, both are normally associated with the 8/20 μs waveform, but they represent different test-duty levels.

Is 40kA Imax Better Than 20kA?

Not enough information is available to answer that from Imax alone.

A proper comparison also requires Ucpv, Type, In, Up, Iscpv, standard, protection configuration and installation conditions.

Can a 40kA Type 2 SPD Replace a Type 1 SPD?

Not simply because its peak current number is larger.

Type 1 is characterized by lightning impulse-current capability such as Iimp and the associated Class I test conditions.

Imax and Iimp should not be directly compared.

What Is the Difference Between Ucpv and Up?

Ucpv is the maximum continuous operating voltage for the PV application.

Up is the declared voltage protection level under specified surge test conditions.

They perform completely different functions in the datasheet.

What Does Iscpv Mean?

Iscpv is the short-circuit current rating of the PV SPD.

More precisely, it describes the maximum prospective short-circuit current for which the SPD, together with its specified disconnector arrangement, is rated.

Is Iscpv the Same as Imax?

아니요.

Imax is a surge discharge-current rating.

Iscpv is a short-circuit-current rating.

The fact that both use kA does not make them interchangeable.

Is a 1000V DC SPD Suitable for Every 1000V Solar System?

Not automatically.

Maximum PV open-circuit voltage should be calculated under the project’s design conditions before selecting Ucpv.

For more detail, see our DC SPD 선정 가이드: 적절한 전압 정격 선택 방법.

Can an IP20 SPD Be Used in an Outdoor Solar Installation?

It may be installed inside a suitable outdoor enclosure, provided the complete installation satisfies the required environmental protection.

IP20 on the SPD itself should not be treated as a weatherproof outdoor rating.

What Standard Should Be Checked for a PV DC SPD?

IEC 61643-31 covers requirements and test methods for SPDs intended for the DC side of photovoltaic installations up to 1500V DC.

IEC 61643-32 provides selection and application principles for PV SPDs.

결론

Reading a DC SPD datasheet becomes much easier once each parameter is treated according to its actual purpose.

For the example:

클래스 II
Ucpv 1000V DC
In 20kA
Imax 40kA
Up 4.0kV
Iscpv 10kA

the correct interpretation is not simply:

“This is a 1000V, 40kA SPD.”

A more complete interpretation is:

• 클래스 II identifies its Class II / Type 2 protection direction.
• Ucpv 1000V DC describes continuous PV voltage compatibility.
• In 20kA describes nominal discharge-current performance.
• Imax 40kA describes maximum declared discharge-current performance.
• Up 4.0kV describes the declared voltage protection level.
• Iscpv 10kA describes the PV short-circuit-current rating.

Each specification answers a different engineering question.

That leads to one simple purchasing principle:

Never select a DC SPD from one voltage number, one kA number or one Type label alone.

The correct SPD is the one whose complete set of ratings matches the PV system voltage, surge environment, equipment protection requirements, short-circuit conditions and installation design.

For solar PV projects requiring 600V, 1000V or 1500V surge protection, explore KUANGYA DC surge protective devices to compare available Type 2 and Type 1+2 models by voltage rating, discharge-current capability and application.