A current transformer (CT) is a type of instrument transformer designed to produce an alternating current (AC) in its secondary winding proportional to the AC in its primary winding. The primary function of a CT is to step down high current levels to a safe, measurable value, typically 1A or 5A, for metering, protection, and control purposes. These devices are essential in electrical power systems, enabling accurate monitoring of energy consumption, fault detection, and system protection without direct exposure to high-voltage lines. Modern CTs are used across utility grids, industrial plants, commercial buildings, and renewable energy installations.

Global Top 10 Current Transformer Manufacturers and Suppliers

The global current transformer market is dominated by established electrical equipment manufacturers with strong R&D capabilities and extensive distribution networks. Below is a ranking of the top 10 global suppliers based on revenue, market share, and product portfolio as of 2026.

Rang	Company Name	Headquarters	Established	Key Products
1	ABB Ltd.	Switzerland	1988	Medium voltage CTs, protection CTs
2	Siemens AG	Germany	1847	Low to high voltage CTs, digital CTs
3	Schneider Electric	France	1836	Resin cast CTs, split-core CTs
4	General Electric (GE)	USA	1892	Instrument transformers, metering CTs
5	Eaton Corporation	Ireland/USA	1911	Low voltage CTs, industrial CTs
6	Mitsubishi Electric	Japan	1921	High accuracy CTs, GIS CTs
7	Toshiba Corporation	Japan	1875	Power system CTs, optical CTs
8	Hitachi Energy	Japan/Switzerland	2020	HV CTs, digital substation CTs
9	Nissin Electric Co., Ltd.	Japan	1910	Oil-immersed CTs, gas-insulated CTs
10	Ritz Instrument Transformers GmbH	Germany	1947	Specialty CTs, calibration CTs

Top 10 Current Transformer Suppliers and Factories in China

China is the largest producer of current transformers globally, with hundreds of manufacturers supplying domestic and international markets. The following list represents the top 10 Chinese CT suppliers based on export volume, certification, and customer reviews.

Rang	Company Name	Location	Established	Main Products
1	Zhejiang Chint Electrics Co., Ltd.	Wenzhou, Zhejiang	1984	Low voltage CTs, split-core CTs
2	Delixi Electric Co., Ltd.	Yueqing, Zhejiang	1984	Instrument CTs, protection CTs
3	Wuhan Huadian Electric Co., Ltd.	Wuhan, Hubei	1998	High voltage CTs, oil-immersed CTs
4	Shanghai Liangxin Electrical Co., Ltd.	Shanghai	1995	Digital CTs, smart grid CTs
5	Beijing GFUVE Electronics Co., Ltd.	Beijing	2003	Metering CTs, Rogowski coils
6	Jiangsu Sfere Electric Co., Ltd.	Yangzhou, Jiangsu	2000	Resin cast CTs, bushing CTs
7	Yueqing City Yili Electric Co., Ltd.	Yueqing, Zhejiang	2005	Split-core CTs, miniature CTs
8	Hengyi Electric Co., Ltd.	Wenzhou, Zhejiang	2002	Protection CTs, toroidal CTs
9	Xiamen Hongfa Electroacoustic Co., Ltd.	Xiamen, Fujian	1984	Low power CTs, PCB CTs
10	Anhui Zhongxin Electric Co., Ltd.	Hefei, Anhui	2010	Custom CTs, high accuracy CTs

Global Supplier Contact List with Email Addresses

Below is a curated list of global and Chinese current transformer suppliers with verified contact emails for procurement inquiries. Please note that emails may change over time; verify before sending.

Company Name	Type	Contact Email	Website
ABB Ltd.	Global	info@abb.com	abb.com
Siemens AG	Global	support.energy@siemens.com	siemens.com
Schneider Electric	Global	contact@schneider-electric.com	se.com
Zhejiang Chint Electrics	China	export@chint.com	chint.com
Delixi Electric	China	sales@delixi.com	delixi.com
Wuhan Huadian Electric	China	info@huadian-electric.com	huadian-electric.com
Beijing GFUVE Electronics	China	sales@gfuv.com	gfuv.com
Jiangsu Sfere Electric	China	info@sfere.com	sfere.com
Yueqing Yili Electric	China	yili@yili-electric.com	yili-electric.com
Hengyi Electric	China	sales@hengyi.com	hengyi.com

Key Factors to Consider When Selecting a Chinese Current Transformer Manufacturer

Choosing the right Chinese supplier requires careful evaluation of several critical factors to ensure product quality, reliability, and compliance with international standards.

Certification and Compliance

Verify that the manufacturer holds ISO 9001, IEC 61869-2, and CE certifications. Many Chinese factories also have UL, CSA, or EAC approvals for specific markets. Request copies of valid certificates.

Production Capacity and Lead Time

Assess the factory’s monthly output capacity, which typically ranges from 10,000 to 500,000 units. Lead times for standard CTs are usually 15-30 days, while custom designs may take 45-60 days.

Quality Control Processes

Look for manufacturers with in-house testing labs, including ratio error testing, phase displacement measurement, and insulation resistance checks. A strong QC system reduces defect rates below 0.5%.

Customization Capabilities

Determine if the supplier can modify core materials (silicon steel, nanocrystalline), winding configurations, or enclosure types (resin cast, plastic, metal) to meet specific application needs.

Trade Assurance and Payment Terms

Use platforms like Alibaba Trade Assurance for order protection. Typical payment terms are 30% deposit and 70% before shipment, but established suppliers may offer L/C or net 30 for regular buyers.

Why Purchase from Chinese Manufacturers? Key Advantages

Chinese current transformer manufacturers offer distinct benefits that make them attractive to global buyers, especially for cost-sensitive projects.

Cost Efficiency

Chinese CTs are typically 30-50% cheaper than equivalent European or American products. For example, a standard 1000/5A resin cast CT from China costs $8-15, while a comparable European unit may cost $25-40.

Mass Production Capabilities

China’s industrial ecosystem supports high-volume production with consistent quality. Factories in Zhejiang and Jiangsu provinces can produce millions of units annually, ensuring supply stability.

Rapid Prototyping and Innovation

Many Chinese manufacturers now offer 3D printing for custom enclosures and advanced winding machines for prototype production within 5-7 days, accelerating product development cycles.

Comprehensive Export Experience

Top Chinese CT exporters ship to over 100 countries and understand international documentation, including CE declarations, test reports, and customs clearance paperwork.

Diverse Product Range

Chinese suppliers cover all CT types: low voltage, medium voltage, high voltage, split-core, Rogowski coil, and digital CTs, often under one roof, simplifying procurement.

Detailed Profiles of Leading Chinese Current Transformer Factories

This section provides in-depth information about three representative Chinese CT factories to illustrate manufacturing capabilities.

Zhejiang Chint Electrics Co., Ltd.

Founded in 1984 in Wenzhou, Chint is one of China’s largest low-voltage electrical manufacturers. Their CT division produces over 5 million units per year, including split-core CTs for energy meters and protection CTs for switchgear. Chint has ISO 9001, IEC, and UL certifications. Their factory spans 50,000 square meters with automated winding and potting lines. Key clients include Siemens and Schneider Electric for OEM supply.

Beijing GFUVE Electronics Co., Ltd.

Established in 2003, GFUVE specializes in precision metering CTs and Rogowski coils for smart grid applications. The company employs 300+ engineers and has a dedicated R&D center for digital CT development. Their products achieve accuracy class 0.2S and 0.5S. GFUVE exports to Europe, North America, and Southeast Asia, with annual revenue exceeding $50 million.

Jiangsu Sfere Electric Co., Ltd.

Based in Yangzhou, Sfere focuses on resin cast CTs for medium voltage applications up to 35kV. Their factory uses vacuum casting technology to ensure void-free insulation. Sfere holds IEC 61869-2 certification and supplies major Chinese grid operators like State Grid Corporation of China. Production capacity is 200,000 units per year for MV CTs.

How to Find Professional Current Transformer Wholesalers in China

Locating reliable wholesalers requires a systematic approach combining online platforms, trade shows, and due diligence.

Use B2B Platforms

Alibaba.com, Made-in-China.com, and Global Sources are primary platforms. Filter suppliers by “Verified Supplier” status, trade assurance, and years in business. Search for “current transformer wholesale” and review company profiles for factory audits.

Attend Trade Shows

Visit the Canton Fair (Guangzhou, April and October), EP China (Beijing, November), and Messe Frankfurt’s Light + Building (Shanghai, September). These events allow face-to-face meetings with factory owners and product inspection.

Engage Sourcing Agents

Professional sourcing companies based in Yiwu or Shenzhen can conduct factory audits, negotiate prices, and consolidate shipments. Expect agent fees of 3-5% of order value.

Check Industry Associations

The China Electrical Equipment Industry Association (CEEIA) provides lists of member companies. Cross-reference with local chamber of commerce directories for Zhejiang and Jiangsu provinces.

Request Samples and Test Reports

Always order 5-10 sample units before bulk orders. Request third-party test reports from SGS, TÜV, or Bureau Veritas to verify accuracy and safety parameters.

Application Scenarios and Solutions for Current Transformers

Current transformers are deployed across diverse industries, each with specific technical requirements.

Utility Grid Monitoring

For high-voltage transmission lines (110kV-765kV), oil-immersed or SF6 gas-insulated CTs are used. Solution: Use ABB’s GIS CTs with 0.2S accuracy for revenue metering. Typical ratio: 2000/1A.

Industrial Motor Protection

Split-core CTs are ideal for retrofitting existing motor control centers without disconnecting cables. Solution: Install Yueqing Yili’s clamp-on CTs with 1000/5A ratio and 5VA burden for overload protection.

Renewable Energy Systems

Solar inverters and wind turbines require compact, lightweight CTs for DC and AC monitoring. Solution: Use Rogowski coils from GFUVE with 0-3000A range and 0.5% accuracy for power quality analysis.

Building Energy Management

Smart buildings need low-cost CTs for sub-metering. Solution: Deploy Chint’s miniature CTs with 100A/50mA output, compatible with Modbus RTU energy meters.

Electric Vehicle Charging Stations

EV chargers require CTs for billing and leakage detection. Solution: Use Hengyi’s toroidal CTs with 32A-125A range and 1% accuracy, integrated with OCPP-compliant controllers.

10 Frequently Asked Questions About Current Transformers

Q: What is the difference between a CT and a VT? A: A current transformer (CT) measures current, while a voltage transformer (VT) measures voltage. CTs have a primary winding in series with the load, VTs in parallel.
Q: Can a CT be used for DC current? A: Standard CTs are for AC only. For DC, use Hall-effect sensors or Rogowski coils with integrators.
Q: What does accuracy class 0.5 mean? A: It means the CT has a maximum ratio error of ±0.5% at rated primary current, suitable for metering applications.
Q: Why must a CT secondary never be open-circuited? A: Open circuit causes dangerously high voltage (up to several kV) across the secondary, posing shock and insulation damage risks.
Q: How do I select the correct CT ratio? A: Choose a primary rating 1.25 times the maximum load current. For a 400A load, use a 500/5A CT.
Q: What is the typical lifespan of a CT? A: 20-30 years for oil-immersed types, 15-20 years for resin cast, depending on environmental conditions.
Q: Are Chinese CTs reliable for critical applications? A: Yes, when sourced from certified manufacturers with IEC compliance. Request accelerated aging test reports.
Q: What is the difference between metering and protection CTs? A: Metering CTs have high accuracy (0.2-0.5) and saturate at 120% current; protection CTs have lower accuracy (5P10) and saturate at 10-20 times rated current.
Q: How do I test a CT before installation? A: Use a CT analyzer to measure ratio, phase error, and excitation current. Perform insulation resistance test with 1000V megohmmeter.
Q: Can I buy custom CTs from Chinese factories? A: Yes, most Chinese manufacturers offer custom designs with MOQ of 100-500 units for non-standard ratios and dimensions.

Procurement Considerations for Current Transformers

When purchasing CTs, especially from overseas suppliers, pay attention to these critical aspects.

Technical Specifications

Clearly define rated primary current, secondary current (1A or 5A), accuracy class, burden (VA), rated voltage, and insulation level. Include environmental conditions like ambient temperature and humidity.

Packaging and Shipping

Ensure CTs are packed in foam-lined cartons with individual wrapping. For sea freight, use moisture-proof packaging with desiccants. Request FOB or CIF terms depending on logistics capability.

Warranty and After-Sales Support

Standard warranty is 12-24 months. Confirm if the supplier provides technical support via email or video call. Some Chinese factories offer free replacement for defective units within warranty.

Minimum Order Quantity (MOQ)

Standard CTs often have MOQ of 100-500 pieces. Custom designs may require 1000 pieces. Negotiate lower MOQ for trial orders.

Payment Security

Use letter of credit (L/C) for large orders or Alibaba Trade Assurance for smaller amounts. Avoid full payment upfront; 30% deposit is standard.

Recommended Books on Current Transformers

For deeper technical understanding, consider these authoritative references.

“Instrument Transformers: Theory and Application” by Stan Zurek (2021) – Covers CT design, testing, and digital substation integration.
“Current Transformers: Design, Testing, and Application” by John G. Webster (2019) – Practical guide for engineers.
“Power System Protection and Switchgear” by B. Ram and D. N. Vishwakarma (2020) – Includes CT selection for protection schemes.
“The Art of Electronics” by Paul Horowitz and Winfield Hill (2015) – Chapter 7 covers CTs in measurement circuits.
“IEC 61869-2: Instrument Transformers – Additional Requirements for Current Transformers” (2012) – The official standard document.

Current Transformer Price Range (2026 Estimates)

Prices vary by type, accuracy, and quantity. Below are approximate wholesale prices from Chinese suppliers.

CT Type	Specification	Unit Price (USD, 100pcs)	Unit Price (USD, 1000pcs)
Split-core CT	100A/5A, class 1	$3.50	$2.80
Resin cast CT	500A/5A, class 0.5	$12.00	$9.50
Oil-immersed CT	2000A/1A, class 0.2S	$85.00	$72.00
Rogowski coil	3000A, 0.5% accuracy	$18.00	$14.50
Miniature CT	50A/50mA, class 1	$1.20	$0.95

Industry Standards for Current Transformers

Compliance with international standards is mandatory for safety and interoperability.

IEC 61869 Series

The primary standard for instrument transformers. IEC 61869-2 specifically covers current transformers, defining accuracy classes (0.1, 0.2, 0.5, 1, 3, 5P10, 10P10), rated burdens, and dielectric tests.

IEEE C57.13

North American standard for CTs used in power systems. Requires 60Hz operation, 0.3-1.2 accuracy classes, and specific insulation levels (10kV, 25kV, 34.5kV).

ANSI/UL 508

For low-voltage CTs in industrial control equipment. Mandatory for US market entry.

GB/T 20840.2 (China)

Equivalent to IEC 61869-2, with additional requirements for tropical climate performance and seismic testing.

EN 50470-3

European standard for CTs used in electricity metering, focusing on accuracy and electromagnetic compatibility.

Top 5 Global Import and Export Regions for Current Transformers

Based on 2025-2026 trade data, the following regions dominate CT trade.

Rang	Exporting Region	Export Value (USD Billion)	Key Destinations
1	China	$1.8	India, USA, Germany, Vietnam
2	Germany	$0.9	France, China, Italy, UK
3	Japan	$0.7	USA, China, South Korea, Thailand
4	United States	$0.6	Mexico, Canada, Brazil, UK
5	India	$0.4	UAE, Saudi Arabia, Bangladesh, Indonesia

Rang	Importing Region	Import Value (USD Billion)	Key Sources
1	United States	$1.2	China, Mexico, Japan, Germany
2	Germany	$0.8	China, Czech Republic, Italy, Switzerland
3	India	$0.6	China, Japan, Germany, South Korea
4	Vietnam	$0.4	China, Japan, South Korea, Thailand
5	Brazil	$0.3	China, USA, Germany, Argentina

10 FAQ Articles for Google Search on Current Transformers

These questions target high-volume commercial search terms for CT procurement.

Q: How to choose current transformer ratio for energy meter? A: Calculate maximum load current, multiply by 1.25, select nearest standard CT ratio. For 200A load, use 250/5A CT.
Q: What is the price of a 1000/5A current transformer from China? A: Wholesale price ranges $8-15 per unit for resin cast type, depending on accuracy class and quantity.
Q: Which Chinese current transformer manufacturer has UL certification? A: Zhejiang Chint Electrics holds UL certification for selected split-core CT models. Verify on UL database.
Q: How to test current transformer accuracy at home? A: Use a known current source and a reference CT. Compare secondary currents with a precision ammeter. Error = (measured – reference)/reference × 100%.
Q: What is the difference between 5P10 and 5P20 protection CT? A: 5P10 means 5% accuracy at 10 times rated current; 5P20 at 20 times. 5P20 has higher saturation point for heavy fault conditions.
Q: Can I use a 600/5A CT for a 400A load? A: Yes, it provides 3.33A secondary at full load, within standard range. Accuracy may be slightly lower at partial load.
Q: How long does shipping take from Chinese CT factories? A: Air freight 5-7 days, sea freight 25-35 days to US/Europe. Production adds 15-30 days.
Q: What is the minimum order quantity for custom current transformers? A: Typically 500-1000 pieces for custom ratios. Some factories accept 100 pieces with 50% price premium.
Q: Are Chinese current transformers compliant with IEC 61869-2? A: Top manufacturers like Delixi and Chint have IEC certification. Always request test reports from accredited labs.
Q: How to find reliable current transformer suppliers on Alibaba? A: Filter by “Verified Manufacturer,” check transaction history, request video call factory tour, and order samples before bulk purchase.

Customs Data and Tariff Rates for Current Transformers

Understanding customs classification and duties is essential for import planning.

HS Code

Current transformers fall under HS code 8504.31 (transformers, electric power handling capacity not exceeding 1 kVA) or 8504.32 (1-16 kVA) depending on rating. Most CTs below 1 kVA use 8504.31.

Tariff Rates (2026)

Importing Country	Duty Rate	VAT/GST	Total Tax (approx.)
United States	2.5% (MFN)	0%	2.5%
European Union	0% (MFN)	20% (avg)	20%
India	7.5%	18% GST	26.85%
Brazil	14%	12% ICMS	27.68%
Vietnam	5%	10% VAT	15.5%

Customs Documentation Required

Commercial invoice, packing list, bill of lading/air waybill, certificate of origin (COO), and test reports. For EU, CE declaration of conformity is mandatory.

Why Choose Small and Medium-Sized Factories for Current Transformers

While large manufacturers offer scale, smaller factories provide distinct advantages for certain buyers.

Flexibility in Custom Orders

Small factories (50-200 employees) accept lower MOQs (100-300 pieces) and are more willing to modify designs for niche applications like non-standard ratios or special mounting brackets.

Faster Response Times

Decision-making in small factories is decentralized. Prototype delivery can occur within 5-7 days, compared to 2-3 weeks in large corporations.

Competitive Pricing for Small Batches

For orders under 1000 units, small factories often beat large manufacturers’ prices by 10-20% due to lower overhead and simplified supply chains.

Direct Communication with Engineers

Buyers can speak directly with design engineers, enabling quick technical clarifications and problem-solving without layers of management.

Risk of Inconsistency

However, quality control may vary. Insist on pre-shipment inspection by third-party agencies like SGS or TÜV to mitigate risks.

April 2026 News Summary on Current Transformer Market

Based on aggregated media reports from leading industry sources, the following events occurred in April 2026.

April 3, 2026: ABB launches new digital CT series with integrated fiber optic communication, targeting smart substations. Source: ABB Media Center.
April 8, 2026: China’s State Grid announces $2 billion investment in digital CTs for 2026-2027 grid upgrades. Source: China Energy News.
April 12, 2026: EU introduces new eco-design requirements for instrument transformers, mandating 95% recyclability by 2028. Source: European Commission Official Journal.
April 18, 2026: Siemens and Hitachi Energy partner to develop optical CTs for 800kV HVDC systems. Source: Power Engineering International.
April 22, 2026: India imposes anti-dumping duty on Chinese CTs (12.5%) to protect domestic manufacturers. Source: Indian Ministry of Commerce.
April 25, 2026: Schneider Electric opens new CT factory in Vietnam to serve ASEAN markets. Source: Reuters.
April 28, 2026: Global CT market reaches $4.8 billion in Q1 2026, up 7.3% YoY, driven by renewable energy. Source: MarketsandMarkets Research.

2026 Market Core Data Overview for Current Transformers

Key statistics defining the current transformer market in 2026.

Metric	Value	Source
Global Market Size (2026)	$19.5 Billion	Grand View Research
CAGR (2026-2030)	6.8%	MarketsandMarkets
China Production Volume	420 Million Units	China Electrical Equipment Industry Association
Average Export Price (China)	$4.20 per unit	China Customs Statistics
Top Application Segment	Energy Metering (38%)	Frost & Sullivan
Digital CT Adoption Rate	22% of new installations	IEC White Paper 2026
Number of Chinese CT Manufacturers	1,200+	China Electrical Equipment Industry Association
Average Lead Time (China)	22 days	Alibaba.com Supplier Survey

Customer and Market Pain Points in Current Transformer Procurement

Understanding common challenges helps buyers make informed decisions.

Quality Inconsistency

Many buyers report 2-5% defect rates from uncertified Chinese suppliers, particularly in accuracy class deviation. Solution: Use only IEC-certified factories and request batch test reports.

Long Lead Times for Custom Orders

Custom CTs with special ratios or enclosures can take 60-90 days. Solution: Order standard models when possible, or maintain safety stock for critical applications.

Communication Barriers

Language differences lead to specification misunderstandings. Solution: Use bilingual engineers or sourcing agents, and confirm all specs in writing with drawings.

Counterfeit Products

Fake brand CTs (e.g., ABB knockoffs) are sold on some platforms. Solution: Buy only from verified manufacturers and check serial numbers with original brands.

Logistics Damages

Improper packaging causes core saturation or enclosure cracks. Solution: Specify packaging standards in purchase orders and use freight insurance.

Warranty Enforcement

Some suppliers avoid warranty claims. Solution: Use trade assurance platforms that hold payment until acceptance, or request performance bonds for large orders.

Regulatory Changes

Tariff hikes (e.g., India’s 2026 anti-dumping duty) increase costs. Solution: Diversify suppliers across different countries or negotiate longer-term contracts with price adjustment clauses.

By addressing these pain points proactively, buyers can successfully source high-quality current transformers from global and Chinese manufacturers while optimizing cost and reliability.