CN Quality Check
Standards Comparison Tool
Standards Comparison Report
IEC low-voltage
GB/T 7251.1-2023 vs IEC 61439-1 — 低压成套开关设备和控制设备 (Low-Voltage Switchgear and Controlgear Assemblies)
EXECUTIVE SUMMARY
This report covers 低压成套开关设备和控制设备 (LV switchgear and controlgear assemblies) — the assembly-level product family, not individual components. GB/T 7251.1-2023 is an IDT adoption of IEC 61439-1:2020, so the base design-verification rules are technically aligned; the real procurement risk sits in the Part 2 sectional standards and in China's CCCF mandatory certification regime. Buyers must verify the correct sectional Part (2/3/4/5/6) for their assembly type — a Part 1 certificate alone does not certify a specific assembly.
APPLICABLE CHINESE STANDARDS
| Standard No. | Title (Chinese) | Scope | Mandatory/Recommended | Status |
|---|---|---|---|---|
| GB/T 7251.1-2023 | 低压成套开关设备和控制设备 第1部分：总则 (LV switchgear and controlgear assemblies — Part 1: General rules) | General rules, design & routine verification | Recommended (GB/T) | Current |
| GB/T 7251.2-2023 | 低压成套开关设备和控制设备 第2部分：成套电力开关和控制设备 (Part 2: Power switchgear and controlgear assemblies) | PSC assemblies | Recommended (GB/T) | Current |
| GB/T 7251.3 | 第3部分：由一般人员操作的配电板 (Part 3: Distribution boards operated by ordinary persons) | DBO distribution boards | Recommended (GB/T) | Current |
| GB/T 7251.4 | 第4部分：建筑工地用成套设备 (Part 4: Assemblies for construction sites) | ACS | Recommended (GB/T) | Current |
| GB/T 7251.5 | 第5部分：公用电网电力配电成套设备 (Part 5: Assemblies for power distribution in public networks) | Public-network distribution | Recommended (GB/T) | Current |
| GB/T 7251.6 | 第6部分：母线干线系统(母线槽) (Part 6: Busbar trunking systems/busways) | Busways | Recommended (GB/T) | Current |
| GB/T 20641-2025 | 低压成套开关设备和控制设备 空壳体的一般要求 (Empty enclosures for LV switchgear and controlgear assemblies — General requirements) | Empty enclosures (separate product) | Recommended (GB/T) | Current |
| GB/T 14048.1-2023 | 低压开关设备和控制设备 第1部分：总则 (LV switchgear and controlgear — Part 1: General rules) | Components inside assemblies | Recommended (GB/T) | Current |
| GB 7251.1 (legacy) | 低压成套开关设备 (historic mandatory edition) | Superseded by GB/T series | — | Superseded |
⚠️ GB/T 7251.8 (智能型成套设备 / intelligent assemblies) is a China-originated part with no confirmed IEC counterpart — Verify: GB/T 7251.8 scope and IEC 61439-8 existence.
STANDARD TIER CLASSIFICATION
| Standard | Tier | Description |
|---|---|---|
| GB/T 7251.1-2023 / IEC 61439-1:2020 | TIER 1 — Product Standard | General rules for assemblies |
| GB/T 7251.2–7251.6 / IEC 61439-2–61439-7 | TIER 1 — Product Standard (sectional) | Type-specific assembly requirements |
| GB/T 20641-2025 / IEC 62208 | TIER 1 — Product Standard (enclosure) | Empty enclosures — separate product |
| GB/T 14048.1-2023 / IEC 60947-1 | TIER 1 — Component Standard | Devices inside the assembly |
FLAG: ✅ No tier mismatch — both sides TIER 1. ⚠️ Misapplication risk: a component certificate (IEC 60947-2 breaker) does NOT certify the assembly; an empty-enclosure certificate (IEC 62208) does NOT certify the assembly.
SCOPE BREAKDOWN
Base — General Rules
Chinese standard: GB/T 7251.1-2023: 低压成套开关设备和控制设备 第1部分：总则
International equivalent: IEC 61439-1:2020 — Ed. 3.0
Equivalence: IDT (identical adoption)
Standard tier match: Both TIER 1 — valid comparison
| Parameter | Chinese Standard Value (Clause) | International Value (Clause) | Deviation | Mutual Recognition | Procurement Impact |
|---|---|---|---|---|---|
| Design verification method | Verified design + routine verification (GB/T 7251.1-2023 §5–§11) | Same (IEC 61439-1:2020 §5–§11) | identical | 直接互认 (Direct mutual recognition) | LOW |
| Temperature-rise limits | Per Part 1 tables [Verify: GB/T 7251.1-2023 §9.2] | Per IEC 61439-1:2020 Table 6 [Verify: §9.2] | identical (IDT) | 直接互认 (Direct mutual recognition) | LOW |
| Short-circuit withstand | Verification per §9.3 [Verify clause] | Same [Verify: IEC 61439-1:2020 §9.3] | identical | 直接互认 (Direct mutual recognition) | LOW |
| IP degree | Per IEC 60529 [Verify: GB/T 7251.1-2023 §8] | Per IEC 60529 | identical | 直接互认 (Direct mutual recognition) | LOW |
Part 2 — 成套电力开关和控制设备 (Power Switchgear and Controlgear Assemblies, PSC)
Chinese standard: GB/T 7251.2-2023
International equivalent: IEC 61439-2:2020 — Ed. 3.0
Equivalence: IDT
Standard tier match: Both TIER 1 — valid comparison
| Parameter | Chinese Standard Value (Clause) | International Value (Clause) | Deviation | Mutual Recognition | Procurement Impact |
|---|---|---|---|---|---|
| PSC-specific requirements | Per GB/T 7251.2-2023 [Verify: §5–§11] | Per IEC 61439-2:2020 [Verify] | identical (IDT) | 直接互认 (Direct mutual recognition) | LOW |
Part 3 — 由一般人员操作的配电板 (Distribution Boards Operated by Ordinary Persons, DBO)
Chinese standard: GB/T 7251.3
International equivalent: IEC 61439-3:2012 — Ed. 1.0
Equivalence: IDT
Standard tier match: Both TIER 1 — valid comparison
| Parameter | Chinese Standard Value (Clause) | International Value (Clause) | Deviation | Mutual Recognition | Procurement Impact |
|---|---|---|---|---|---|
| DBO requirements | Per GB/T 7251.3 [Verify: §5–§11] | Per IEC 61439-3:2012 [Verify] | identical (IDT) | 直接互认 (Direct mutual recognition) | LOW |
Part 4 — 建筑工地用成套设备 (Assemblies for Construction Sites, ACS)
Chinese standard: GB/T 7251.4
International equivalent: IEC 61439-4:2012 — Ed. 1.0
Equivalence: IDT
Standard tier match: Both TIER 1 — valid comparison
| Parameter | Chinese Standard Value (Clause) | International Value (Clause) | Deviation | Mutual Recognition | Procurement Impact |
|---|---|---|---|---|---|
| ACS requirements | Per GB/T 7251.4 [Verify: §5–§11] | Per IEC 61439-4:2012 [Verify] | identical (IDT) | 直接互认 (Direct mutual recognition) | LOW |
Part 5 — 公用电网电力配电成套设备 (Assemblies for Power Distribution in Public Networks)
Chinese standard: GB/T 7251.5
International equivalent: IEC 61439-5:2020 — Ed. 2.0
Equivalence: IDT
Standard tier match: Both TIER 1 — valid comparison
| Parameter | Chinese Standard Value (Clause) | International Value (Clause) | Deviation | Mutual Recognition | Procurement Impact |
|---|---|---|---|---|---|
| Public-network requirements | Per GB/T 7251.5 [Verify: §5–§11] | Per IEC 61439-5:2020 [Verify] | identical (IDT) | 直接互认 (Direct mutual recognition) | LOW |
Part 6 — 母线干线系统(母线槽) (Busbar Trunking Systems / Busways)
Chinese standard: GB/T 7251.6
International equivalent: IEC 61439-6:2012 — Ed. 1.0
Equivalence: IDT
Standard tier match: Both TIER 1 — valid comparison
| Parameter | Chinese Standard Value (Clause) | International Value (Clause) | Deviation | Mutual Recognition | Procurement Impact |
|---|---|---|---|---|---|
| Busway requirements | Per GB/T 7251.6 [Verify: §5–§11] | Per IEC 61439-6:2012 [Verify] | identical (IDT) | 直接互认 (Direct mutual recognition) | LOW |
Empty Enclosures — 空壳体 (Separate Product)
Chinese standard: GB/T 20641-2025
International equivalent: IEC 62208 — [Verify edition year]
Equivalence: IDT (adoption)
Standard tier match: Both TIER 1 — valid comparison
| Parameter | Chinese Standard Value (Clause) | International Value (Clause) | Deviation | Mutual Recognition | Procurement Impact |
|---|---|---|---|---|---|
| Enclosure requirements | Per GB/T 20641-2025 [Verify: §5–§10] | Per IEC 62208 [Verify] | identical (IDT) | 直接互认 (Direct mutual recognition) | LOW |
KEY DIFFERENCES SUMMARY
- Base standard alignment — GB/T 7251.1-2023 is IDT to IEC 61439-1:2020. Deviation: identical. 直接互认 (Direct mutual recognition). Impact: LOW.
- Sectional Part mapping — GB/T 7251.2–7251.6 map to IEC 61439-2–61439-7. Buyer must confirm the correct Part for the assembly type. 直接互认 (Direct mutual recognition). Impact: MEDIUM (wrong Part = wrong certificate).
- GB/T 7251.8 (智能型成套设备 / intelligent assemblies) — China-originated part; no confirmed IEC counterpart. 不可互认 (Not mutually recognised) pending verification. Impact: HIGH if product is "intelligent".
- CCCF mandatory certification — China requires CCCF for many LV assembly categories; IEC has no equivalent mandatory scheme. 不可互认 (Not mutually recognised) at certification level. Impact: HIGH.
- Component vs assembly boundary — GB/T 14048.1 / IEC 60947-1 covers components, not assemblies. 不可互认 (Not mutually recognised) if certificate is component-level. Impact: HIGH.
REGULATORY LINKAGE TABLE (法规联动)
| Compliance Scenario | Chinese Regulatory Basis | International Regulatory Basis |
|---|---|---|
| Mandatory product certification | CCCF (中国强制性产品认证 — China Compulsory Certification for fire/safety products) [Verify: whether specific LV assembly category is in CCCF catalogue] | UL Listing / CE marking / UKCA |
| Engineering acceptance inspection | GB 50303-2015 (建筑电气工程施工质量验收规范 — Code for acceptance of electrical installation works) | NFPA 70 / local wiring regulations |
| Import/export compliance | CCIB (China Commodity Inspection Bureau) / customs inspection | Destination-country customs standard |
| Designer/engineer obligation | N/A for product standard comparison (cite GB 50303-2015 for installation) | Local building regulation / IEC 60364 |
AUDIT FLAG RESOLUTION
- ✅ RESOLVED: GB/T 7251.1-2023 status = CURRENT (现行) per std.samr.gov.cn. No supersession note added.
- ✅ RESOLVED: GB/T 7251.2-2023 status = CURRENT (现行). No supersession note added.
- ✅ RESOLVED: GB/T 20641-2025 status = CURRENT (现行). No supersession note added.
- ✅ RESOLVED: GB/T 14048.1-2023 status = CURRENT (现行). No supersession note added.
- ✅ FALSE POSITIVE (domain flag): GB/T 14048.1-2023 — flagged as potential misapplication (component standard in an assembly report). Usage is valid because it defines the switching devices inside the assembly; it is cited only to draw the component/assembly boundary, not as the assembly standard.
- ⚠️ UNRESOLVED: GB/T 7251.8 (智能型成套设备) — verify scope and whether IEC 61439-8 exists. Verify against GB/T 7251.8 official text.
- ⚠️ UNRESOLVED: IEC 61439-7 edition year and GB/T 7251.7 existence — Verify: IEC 61439-7:2021 and GB/T 7251.7.
- ⚠️ UNRESOLVED: CCCF catalogue inclusion for specific LV assembly categories — Verify: CNCA CCCF catalogue.
PROCUREMENT VERDICT
- Confirm the exact assembly type and its correct sectional Part (GB/T 7251.2–7251.6 / IEC 61439-2–61439-7) before accepting any certificate.
- Require the supplier's certificate to name the assembly standard (GB/T 7251.x), not a component standard (GB/T 14048.x).
- Verify CCCF certification status for the specific assembly category — IEC/CE/UL certificates do NOT satisfy China's mandatory scheme.
- For "intelligent" assemblies, obtain GB/T 7251.8 compliance evidence separately (no IEC mutual recognition).
- Confirm empty-enclosure compliance is certified under GB/T 20641-2025 / IEC 62208, distinct from the assembly certificate.
- Require design-verification documentation per GB/T 7251.1-2023 §5–§11 (not routine verification alone).
REFERENCE DOCUMENT CHECKLIST (配套调阅清单)
- GB/T 7251.1-2023 §5–§11 — design verification, temperature-rise, short-circuit, IP
- GB/T 7251.1-2023 §9.2 — temperature-rise limits table
- GB/T 7251.1-2023 §9.3 — short-circuit withstand verification
- GB/T 7251.2-2023 §5–§11 — PSC-specific requirements
- GB/T 7251.8 — intelligent assembly scope (verify existence/scope)
- GB/T 20641-2025 §5–§10 — empty enclosure requirements
- GB/T 14048.1-2023 — component boundary definition
- IEC 61439-1:2020 §5–§11 — international base rules
- IEC 61439-7 — edition year and scope (verify)
- CNCA CCCF catalogue — LV assembly category inclusion (verify)
FIELD INSPECTION CHECKLIST
- Verify the nameplate cites the correct GB/T 7251.x Part matching the assembly type.
- Confirm CCCF mark and certificate number are valid and cover the specific model.
- Check design-verification file (type test reports) exists — not just routine verification.
- Inspect temperature-rise test records against GB/T 7251.1-2023 §9.2 limits.
- Verify IP rating marking matches the declared IP degree (IEC 60529).
Need on-site compliance verification in China?
This report is an AI-assisted technical reference. For physical inspection, material testing, and official acceptance in China, contact Yang Jia directly.
Request an Inspection →
This report is for reference only and does not constitute legal or engineering advice. Always verify against the current official standard text.