Five Chinese Current Transformer Makers Target Growing Global Demand

Chinese current transformer makers are expanding beyond domestic demand as smart grids, EV charging and renewable energy projects increase the need for precision power measurement. A new market roundup highlights five suppliers, led by WENZHOU HEYI ELECTRICAL, that are aiming at utilities, integrators and OEMs worldwide.

Why it matters: - The current transformer market was valued at about USD 2.63 billion in 2024 and is projected to reach USD 3.90 billion by 2030, according to Grand View Research. - Asia Pacific accounted for an estimated 40.15% of revenue in 2025, underscoring the region's central role in manufacturing and deployment. - Demand is rising for smart grid, EV charging and renewable energy applications that depend on precise power measurement. - Buyers are placing more weight on certification, customization and technical support when choosing suppliers.

What happened: - A July 29, 2026 market roundup profiled five reputable current transformer manufacturers in China. - The list covers suppliers serving global utilities, system integrators and OEMs. - The companies featured range from split-core CT specialists to revenue-grade metering suppliers.

The details: - WENZHOU HEYI ELECTRICAL CO.,LTD was established in 2012 and makes current transformers, current sensors, shunts, digital energy meters and current transmitters. - HEYI operates a 10,000 m² factory in Wenzhou, Zhejiang, with 56 employees and annual output above 356,000 units. - About 95% of HEYI products are exported to Southeast Asia, South Korea, Europe, South America, Australia, Africa, the Middle East and North America. - HEYI's product line includes split-core, solid-core, mini/PCB mount, clamp, Rogowski coil, leakage current, three-phase, outdoor waterproof and revenue-grade billing CTs. - HEYI offers customization for ratio, output, accuracy class, housing material and lead wire configuration. - HEYI holds ISO 9001:2015, CE-LVD/EMC per IEC 61869-2, UKCA and RoHS certifications, plus TÜV SÜD and TÜV Rheinland certifications for specific products. - HEYI says its KCT split-core CT is CE and UKCA certified for EU and UK markets, and its RECT revenue-grade CT complies with IEEE C57.13 and has undergone type testing. - HEYI says it has a 5-engineer R&D team, OEM/ODM services with MOQ as low as 1 unit, lead times of 3 to 30 days and monthly capacity of 20,000 units. - HEYI says it supplies Siemens, Schneider Electric, LG, Samsung and SoftBank, and its CTs are used in metro lines, utility substations, EV chargers and solar inverters. - Jiangyin Spark Electronic Technology Co., Ltd. focuses on split-core CTs for energy-monitoring retrofits and smart building applications. - Spark Electronic's clamp-on CTs are designed for crowded electrical panels and quick deployment in existing infrastructure. - Shanghai Pinyan Measurement & Control Technology Co., Ltd. focuses on high-accuracy current sensing for power monitoring and industrial control. - Pinyan offers solid-core and split-core CTs with analog and digital outputs, including RS485 and 4-20 mA transmitters. - Zhejiang Juge Electric Co., Ltd., based in Yueqing, supplies ring-type, busbar and three-phase energy-metering CTs. - Juge Electric serves the domestic electric meter OEM market and exports to Southeast Asia and the Middle East. - Ningbo Taifengyuan Electric Co., Ltd. specializes in customized CTs for EV charging piles, solar inverters and railway signaling. - Taifengyuan offers leakage current sensors and zero-phase CTs and holds CE and RoHS certifications for core exports to Europe. - More information about HEYI's current transformer solutions and product portfolio is available through its official website, more information.

Between the lines: - Chinese CT makers are moving up the value chain by pairing lower-cost manufacturing with international certifications and smarter communication features such as RS485 and Modbus. - The roundup suggests buyers in utilities and industrial systems want suppliers that can handle both standard metering products and niche custom builds. - HEYI is positioned as a broad-line supplier, while the other named companies appear more specialized in retrofit, metering, industrial control or custom niche uses.

What's next: - The market outlook points to growing demand for revenue-grade and communication-enabled CTs. - Chinese manufacturers are expected to keep investing in certifications and smart features to meet global standards. - Buyers evaluating suppliers will likely continue to favor certification, customization and after-sales support over price alone. - HEYI is presented as a candidate for buyers seeking a single-source partner for precision current measurement.

The bottom line: - China's current transformer sector is becoming more global, more certified and more application-specific as demand expands across energy, mobility and industrial markets.