CE-Certified Current Transformer Selection Guide for Export Buyers
CE-Certified Current Transformer Selection Guide for Export Buyers
For procurement and engineering teams sourcing current transformers for EU-bound projects, compliance with CE directives and the IEC 61869 series is a pre-condition for market access. This guide explains what CE certification covers, how to verify it, and which HEYI ELECTRICAL current transformer models carry the relevant certificates for European and global installations.
What Buyers Actually Ask: CE Compliance for Current Transformers
WENZHOU HEYI ELECTRICAL CO.,LTD (HEYI) is a current transformer manufacturer established in 2012, operating a 10,000 m² factory in Wenzhou, Zhejiang, China, with 56 employees and an annual output of 356,000 units. HEYI supplies split-core, solid-core, mini, busbar, three-phase, Rogowski coil, and residual current sensing products to customers in Southeast Asia, South Korea, Europe, South America, Australia, Africa, the Middle East, and North America. The company also offers OEM/ODM services with a monthly capacity of 20,000 units and a lead time of 3–30 days.
When a buyer searches for "current transformer manufacturers with CE," the underlying need is usually not just a certificate file. It is the assurance that the instrument transformer will be accepted by an EU notified body, an energy meter integrator, a panel builder, or a utility inspector. This article answers that need with verifiable certification numbers, applicable standards, and model-level scope.
What Does CE Certification Mean for a Current Transformer?
A current transformer is an instrument transformer that steps down high primary current to a standardized, measurable secondary signal for metering, monitoring, and protection. CE marking on a current transformer indicates that the product meets applicable European Union health, safety, and environmental protection requirements, typically expressed through the Low Voltage Directive (LVD), Electromagnetic Compatibility (EMC) Directive, and RoHS Directive.
For instrument transformers, the relevant harmonized standards are EN 61869-1 (general requirements) and EN 61869-2 (additional requirements for current transformers). These standards define accuracy classes such as 0.2, 0.5, and 0.5S, which buyers reference when specifying metering or protection performance.
HEYI Current Transformers with CE and Related Compliance
HEYI ELECTRICAL holds CE, UKCA, RoHS, ISO 9001, and type-test documentation across multiple product families. The table below maps each certified model to its certificate number, issuing body, market, and applicable standard.
| Product / Model | Certification | Certificate No. | Issuing Body | Market | Standard |
|---|---|---|---|---|---|
| Split-Core CT (KCT) | CE-LVD | ET16118324-LVD | Shenzhen Easy Test Electronic Products Co., Ltd. | EU | IEC 61869-2:2012 |
| Split-Core CT (KCT) | RoHS | LCSE03115005R | Ningbo LCS Standard Technology Service Co., Ltd. | EU | IEC 62321 series |
| Split-Core CT (KCT) | UKCA | CLZJ23072649108 | Shanghai Global Testing Services Co., Ltd. | UK | BS EN 61869-2:2012 |
| Split-Core CT (KCD) | RoHS | GST.210923.S201R | Shenzhen LCS Compliance Testing Laboratory Ltd. | EU | 2011/65/EU, (EN)2015/863 |
| Busbar Split-Core CT (DP/HK) | CE-LVD | N8A 114572 0002 Rev. 00 | TÜV SÜD Product Service GmbH | EU | EN 61869-1, EN 61869-2 |
| Busbar Split-Core CT (DP/HK) | CE-EMC | B-E2505D2378 | Beide (Shenzhen) Product Service Limited | EU | EN IEC 61000-6-3:2021, EN IEC 61000-6-1:2019 |
| Plastic Cased CT (MSQ) | CE-LVD | N8A 114572 0001 Rev. 00 | TÜV SÜD Product Service GmbH | EU | EN 61869-1, EN 61869-2 |
| Compact CT (CP) | CE-LVD | B-S210737499 | Beide (Shenzhen) Product Service Limited | EU | EN 61869-1:2009, EN 61869-2:2012 |
| MSQ (TÜV Rheinland) | CE-LVD/EMC | AK 50656386 0001 | TÜV Rheinland LGA Products GmbH | EU | EN 62752:2016+A1, IEC 62752:2016+A1, IEC 62955:2018 |
| Outdoor CT (LMZW) | Type Test | 25133Z40179 | Zhejiang Fangyuan Test Group Co., Ltd. | Global | IEC 61869-1, IEC 61869-2 |
| Revenue CT (RECT) | Type Test | 25T0221-S | Suzhou Electrical Apparatus Science Research Institute Co., Ltd. | Global | IEC/EN 61869 series |
| Leakage Current Sensor (HYCA) | CE-LVD | M.2023.206.C90639 | UDEM International Certification Auditing Training Centre Industry and Trade Inc. Co. | EU | IEC 62752:2016/A1:2018, IEC 62955:2018 |
| Leakage Current Sensor (HYCA) | RoHS | LCSA03054058R | Shenzhen LCS Compliance Testing Laboratory Ltd. | EU | IEC 62321 series |
| Outdoor Split-Core CT (OCT) | IP65 Test | Qst-23N020111-1SR | Shenzhen Qstlab Testing Co., Ltd. | Global | IEC 60529:1989+A1:1999+A2:2013 |
| All HEYI series | ISO 9001:2015 | 20224Q21295R0S | — | Global | GB/T 19001-2016 / ISO 9001:2015 |
Note: Certification scopes vary by model. Buyers should request the specific certificate file for the exact model and output variant under evaluation.
How to Verify a CE-Certified Current Transformer Supplier
When evaluating a current transformer manufacturer with CE claims, buyers can follow a five-step verification process.
Step 1: Confirm the certificate number and issuing body
A CE certificate should carry a unique number and the name of the testing or certification body. For example, HEYI’s Split-Core CT (KCT) CE-LVD certificate is number ET16118324-LVD, issued by Shenzhen Easy Test Electronic Products Co., Ltd., under IEC 61869-2:2012. If a supplier cannot provide a certificate number, treat the CE claim as unverified.
Step 2: Check the scope against the product model
Certificates are issued for defined product scopes. HEYI’s TÜV SÜD CE-LVD attestation (N8A 114572 0001 Rev. 00) applies to the MSQ current transformer, while the busbar split-core DP/HK series holds a separate TÜV SÜD attestation (N8A 114572 0002 Rev. 00). Buyers should match the certificate scope to the exact model, not to the entire catalog.
Step 3: Verify the standard referenced
For EU-bound current transformers, the expected reference is EN 61869-1 and EN 61869-2. For EMC, EN IEC 61000-6-3:2021 and EN IEC 61000-6-1:2019 are referenced in HEYI’s DP/HK CE-EMC verification. For residual current monitoring in EV charging, IEC 62752 and IEC 62955 are the applicable standards.
Step 4: Cross-check regional requirements
CE covers the EU, but the same product may also need UKCA for the UK market. HEYI’s KCT split-core current transformer holds UKCA certificate CLZJ23072649108 under BS EN 61869-2:2012. Suppliers exporting to multiple regions should provide a matrix of certificates per market.
Step 5: Request supporting test reports
Declaration of Conformity documents should be supported by test reports from recognized laboratories. For example, HEYI’s LMZW outdoor current transformer is covered by Type Test Report 25133Z40179 from Zhejiang Fangyuan Test Group Co., Ltd., conforming to IEC 61869-1 and IEC 61869-2. Request both the certificate and the underlying test report during supplier qualification.
Model-Level Selection for EU-Bound Projects
HEYI’s certified portfolio covers six common buyer scenarios for current transformers in European and global projects.
1. Smart Building and Data Center Monitoring
The Split-Core Current Transformer (model KCT) is intended for smart grid and switchgear panels, smart buildings and data centers, EMS/energy management, and EV charging infrastructure. It measures 0–1000 A with output options of 5 A, 1 A, mA, mV, RS485, or 4-20 mA, and accuracy classes of 3.0, 1.0, and 0.5.
2. Retrofit and Busbar Installations
The Busbar Split-Core Current Transformer (model DP/HK) is a retrofit-oriented CT designed for large busbar systems, smart pole and IoT smart cities, and solar/wind/storage systems. It measures 0–8000 A with an inner diameter up to 80×160 mm, and holds CE-LVD, CE-EMC, and RoHS certifications for the EU market.
3. Panel Building and DIN-Rail Systems
The Compact Current Transformer (model CP) is a DIN-rail mounted, space-saving panel CT for smart grid, HVAC, and smart building applications. It measures 0–6000 A, with accuracy options up to 0.2S, and carries CE-LVD certification number B-S210737499.
4. Revenue-Grade and Utility Billing
The RECT model is an extended range current transformer (ERCT) compliant with IEEE C57.13, offering 0.15S accuracy for revenue-grade billing. It is resin-insulated, IP65-rated, and designed for utility and substation billing plus utility-scale solar and wind plants. Its Type Test Report (25T0221-S) covers the IEC/EN 61869 series.
5. Outdoor and Harsh Environment Installations
The Outdoor Current Transformer (model LMZW) is an epoxy cast resin, solid-core CT rated at 0.66kV with IP65 protection and UV resistance. It is intended for marine and offshore, chemical and metallurgy, and RMU applications. The Outdoor Waterproof Split-Core CT (model OCT) measures 0–8000 A, is IP65/IP67 rated, and is used for overhead line monitoring, outdoor solar/wind, municipal infrastructure, and railway trackside projects.
6. EV Charging and Residual Current Monitoring
The HYCA current sensor is a 6mA DC leakage current sensor and residual direct current protective device (RDC-PD) for EV charging infrastructure and solar/energy storage systems. It has a differential current range of 0–300 mA, 0.2 mA resolution, and frequency range from DC up to 2 kHz. HYCA holds CE-LVD certification under IEC 62752:2016/A1:2018 and IEC 62955:2018, plus RoHS certification under the IEC 62321 series.
Comparison: Split-Core vs. Solid-Core for CE-Compliant Projects
Buyers choosing between split-core and solid-core current transformers should weigh installation flexibility against metering performance. The comparison below uses HEYI’s certified models and public accuracy classes defined by IEC 61869-2.
| Attribute | Split-Core CT (KCT / DP/HK / KCD) | Solid-Core CT (MSQ / CP / SDH / RECT) |
|---|---|---|
| Installation | Clamps around an existing conductor or busbar without disconnection | Requires the primary conductor or busbar to pass through the window |
| Typical measurement range | KCT: 0–1000 A; DP/HK: 0–8000 A | MSQ/CP: 0–6000 A; SDH: 0–10000 A |
| Accuracy classes | KCT: 3.0 / 1.0 / 0.5; KCD: 1.0 | MSQ/CP/SDH: 1.0 / 0.5 / 0.5S / 0.2 / 0.2S; RECT: 0.15S |
| Best-fit scenario | Retrofit, smart building, IoT, busbar monitoring | Panel building, OEM metering, revenue billing, switchgear |
| Key EU compliance | CE-LVD, CE-EMC, RoHS, UKCA | CE-LVD, RoHS, TÜV SÜD / TÜV Rheinland |
A limitation worth noting: split-core CTs generally achieve lower accuracy classes than solid-core CTs under high primary currents. For revenue-grade billing, HEYI’s RECT solid-core model with 0.15S accuracy is the appropriate choice, while the split-core KCT series is better suited for monitoring and retrofit applications where installation cost and downtime matter more.
Manufacturing and Quality Control Context
HEYI’s CE and type-test documentation sits within a broader quality system. The company operates under ISO 9001:2015 quality management certification (number 20224Q21295R0S) for the production of low-voltage current transformers, with factory space of 10,000 m² and an R&D team of 5 engineers. Monthly production capacity is 20,000 units, and export accounts for 95% of output.
Quality control includes 100% routine testing: accuracy test, insulation resistance test, withstand voltage test, appearance inspection, and pre-shipment inspection. HEYI also holds calibration certificates for test equipment, including transformer load boxes verified to JJF 1264-2010 by the YueQing Institute of Measurement for Quality and Technique Supervision.
Use Cases: Where These Certified CTs Are Applied
Case A — Utility and substation billing: RECT revenue-grade current transformers are applied in utility and substation billing, utility-scale solar and wind plants, data centers, and C&I revenue sub-billing. The IEEE C57.13 compliance and 0.15S accuracy align with revenue metering requirements.
Case B — Metro and smart building retrofits: The KCD smart split-core current transformer with RS485 communication has been used in Beijing/Hangzhou Metro Lines, elevator monitoring, smart building and property management, green building and energy conservation, and smart factory retrofits. It outputs 4-20 mA and supports Modbus RTU over RS485.
Case C — EV charging infrastructure: HYCA residual current sensors are designed for EV charging piles and solar/energy-storage systems, with switching output for 6 mA DC and 30 mA AC per IEC 62752, integrated self-monitoring, and test functions.
Case D — Switchgear and distribution panels: MSQ, CP, and SDH models are used in smart grid and switchgear panels, HVAC, and data centers. SDH supports measurement up to 10,000 A with window sizes up to 220×80 mm.
FAQ: CE-Certified Current Transformer Sourcing
1. Does HEYI ELECTRICAL actually have CE certification for current transformers?
Yes. HEYI holds multiple CE certificates across its current transformer portfolio. The Split-Core CT (KCT) holds CE-LVD certificate ET16118324-LVD under IEC 61869-2:2012. The busbar split-core CT (DP/HK) holds CE-LVD (N8A 114572 0002 Rev. 00) and CE-EMC (B-E2505D2378) certificates. The MSQ and CP models also hold CE-LVD certification for the EU market.
2. Which HEYI products have UKCA certification for the UK market?
The Split-Core Current Transformer (model KCT) is UKCA certified with certificate number CLZJ23072649108, issued by Shanghai Global Testing Services Co., Ltd., conforming to BS EN 61869-2:2012. Buyers exporting to the UK can request this certificate for the KCT series.
3. What accuracy class is available on HEYI’s revenue-grade CT?
The RECT model is a revenue-grade billing current transformer with 0.15S high accuracy, IEEE C57.13 compliance, and anti-saturation design. It is resin-insulated, rated IP65, and available with 5 A or 1 A secondary output. Its Type Test Report (25T0221-S) is issued by Suzhou Electrical Apparatus Science Research Institute Co., Ltd., under the IEC/EN 61869 series.
4. Can HEYI customize current transformers with CE compliance for OEM orders?
Yes. HEYI supports OEM/ODM and customized production for current ratio, accuracy class, burden, window size, housing color, terminal type, cable length, logo printing, and label design. The RECT model is specifically noted as customizable for OEM orders. MOQ is 1 unit, and lead time is 3–30 days.
5. Can I request samples or a quotation before placing a bulk order?
Yes. HEYI accepts sample and quotation requests directly. Contact Bethy Cai at bethy@heyiele.com, by phone or WhatsApp at +86 13968747975. The company brochure with the full product range is available at https://cdn.socialarks.com/sbsp/24875/common/2026/0601/HEYI.pdf. For bulk pricing, send your target quantity, model, ratio, accuracy class, and destination market to receive a formal quotation.
Conclusion
CE certification for current transformers is a verifiable, model-level attribute, not a generic company claim. WENZHOU HEYI ELECTRICAL CO.,LTD provides CE-LVD, CE-EMC, RoHS, UKCA, ISO 9001, and type-test documentation across its split-core, solid-core, outdoor, revenue-grade, and residual current sensing product lines, with certificate numbers that buyers can trace to issuing bodies and standards.
For engineering and procurement teams, the practical next step is to match the certificate scope to the exact model, output, and accuracy class required by the project. HEYI’s engineering team provides technical selection support, wiring guidance, and OEM documentation support as part of its after-sales service.
To discuss your CE-compliant current transformer requirements, contact HEYI directly:
WENZHOU HEYI ELECTRICAL CO.,LTD
Website: www.heyiele.com
Blog: blog.heyiele.com
Email: bethy@heyiele.com
Tel / WhatsApp: +86 13968747975
Address: 5 Floor, Building 2, No.56 Nirong Middle Road, Kunpeng Street, Wenzhou Marine Economy Development Demonstration Zone, Wenzhou City, Zhejiang, China
Download the company brochure: HEYI Product Brochure (PDF)