Are you searching for reliable, high-precision Current Transformers for your power distribution and protection systems? Look no further than Jinhand, a leading China manufacturer, supplier, and factory specializing in advanced electrical measurement solutions. With over a decade of industry expertise, Jinhand designs and produces a comprehensive range of Current Transformers that comply with stringent international and domestic standards, including GB/T 20840 and IEC 61869. Our products are engineered for durability, accuracy, and cost-efficiency, serving clients across more than 30 countries in sectors like power generation, industrial automation, infrastructure, and renewable energy. Whether you need standard models or fully customized solutions, Jinhand provides end-to-end support from technical consultation and design confirmation to installation guidance and after-sales service. Discover why global engineers and project managers trust Jinhand for their critical Current Transformer requirements.
A Current Transformer is a vital instrument used in electrical power systems to safely measure alternating current. It steps down high primary currents to standardized, manageable secondary levels (typically 5A or 1A) for metering, protection, and control devices. By providing electrical isolation between the high-voltage primary circuit and the low-voltage secondary instruments, it ensures safety for personnel and equipment. Jinhand's Current Transformers utilize precision-engineered magnetic cores and windings to deliver accurate signal transformation with minimal phase and ratio errors, enabling reliable energy monitoring, fault detection, and system protection.
Selecting the appropriate Current Transformer is crucial for system accuracy, safety, and compliance. Here are key factors to consider, with Jinhand's product offerings as a guide:
For systems up to 1kV, consider compact, cost-effective models like the LSY-10 Three Phase Integrated Current Transformer, ideal for indoor distribution cabinets.
For substations and industrial plants, the LZZBJ9-10C1 (12/42/75 kV insulation) and LZZBJ9-35 Fully Enclosed Pillar Type (40.5/95/200 kV insulation) offer robust, fully insulated designs suitable for harsh environments.
Ensure the CT's rated insulation voltage exceeds your system's maximum operating voltage. For example, the LMZC-10 is rated at 0.72/3 kV, perfect for low-voltage metering and protection panels.
For billing or high-precision monitoring, choose accuracy classes like 0.2, 0.2S, or 0.5. Jinhand's LMZC-10 offers a single-winding accuracy of 0.5, while the LZZBJ9-10C1 provides options like 0.2(S) for superior precision.
For relay and circuit breaker operation, protection classes such as 5P, 10P, 10P5, 10P10, 10P20, or 10P30 are used. The LSY-10 supports 10P5, 10P10, and 10P20, ensuring reliable fault detection without nuisance tripping.
To save space and cost, opt for dual-winding CTs like the LMZC-10 (0.5/10P10) or the LZZBJ9-35 which integrates 0.2S/0.5 for metering with 10P20/10P30 for protection in one device.
Jinhand offers a wide spectrum from 5A to 3150A (e.g., LZZBJ9-10C1) to match various load capacities. The LXK Open Core Zero Sequence Current Transformer supports ratios from 20/1 to 600/5.
Standard outputs are 5A or 1A. Select based on your instrument's input requirements.
Ensure compatibility with your grid frequency – 50 Hz or 60 Hz. All Jinhand Current Transformers support both.
Standard models like LXK are for indoor use (IP54 for outdoor cabinets), while the LZZBJ9-35 is designed for outdoor substations with full weather resistance.
Most Jinhand CTs operate reliably from -5℃ to +40℃, with some like the JZZV110 Combined Transformer handling -40℃ to +40℃.
For compact panels, the integrated LSY-10 three-phase unit saves significant space. For cable or busbar applications without circuit interruption, the open-core LXK allows easy clip-on installation.
For ground fault protection, the LXK Open Core series is specifically designed to detect leakage/unbalanced currents.
The LZZBJ9-35 offers dual transformation ratios (e.g., 50-100/5), providing flexibility for system upgrades or load variations.
Optional IoT modules enable remote current monitoring and predictive maintenance.
To aid in selection, here are detailed technical tables for some of Jinhand's flagship Current Transformer models:
| Rated Current Ratio | Accuracy Class | Rated Output(VA) |
| 20/1 | 10P5 | 0.5 |
| 50-100/1 | 10P5 | 1 |
| 150/1 | 10P10 | 1.5 |
| 200/1-300/1 | 10P10 | 2.5 |
| 400/1-600/1 | 10P10 | 5 |
| 100/5 | 10P5 | 1.5 |
| 150-200/5 | 10P10 | 2.5 |
| 300/5-400/5 | 10P10 | 3.75 |
| 500/5-600/5 | 10P10 | 5 |
Note: Custom ratios and parameters are available upon consultation with Jinhand.
Jinhand employs state-of-the-art automated production lines featuring robotic welding, CNC winding, and vacuum impregnation processes. Each Current Transformer undergoes rigorous testing, including power frequency withstand voltage, accuracy calibration, partial discharge, and temperature rise tests, achieving a factory pass rate exceeding 99.8%. Our dedicated R&D center continuously optimizes materials and designs, such as using high-permeability, low-loss silicon steel cores to enhance efficiency and longevity.
With a design power factor of cosφ = 0.8 (lagging), Jinhand CTs reduce reactive power losses, improving overall system energy efficiency.
Constructed with high-quality insulating materials and fully sealed epoxy resin encapsulation, our transformers are built to last, minimizing replacement frequency and long-term maintenance costs. The LZZBJ9-10C1, for example, is designed for a service life of over 30 years.
Products like the LSY-10 (three-phase integrated) and dual-winding models consolidate multiple functions into one device, reducing the number of components, installation time, and wiring complexity.
Jinhand's extensive portfolio caters to diverse applications. Here are three highlighted product categories:
Ideal for space-constrained low-voltage distribution cabinets, this unit combines all three phases into a single, compact device. It simplifies installation, reduces wiring points, and offers protection classes up to 10P20.
This series, including the LZZBJ9-10C1 (10kV) and LZZBJ9-35 (35kV), features fully enclosed cast resin insulation for outstanding durability. With high insulation levels (up to 40.5/95/200 kV), multiple accuracy/protection winding combinations, and strong short-circuit withstand capability, it is the go-to choice for utility and industrial medium-voltage applications.
Designed for ground fault protection, this CT can be easily clipped around existing conductors without disconnecting the primary circuit. Available in inner diameters from Φ80mm to Φ240mm, it supports live-line installation and is essential for detecting leakage currents in mining, petrochemical, and building electrical systems.
As a full-service China manufacturer, supplier, and factory, Jinhand provides comprehensive support:
Our technical team offers free selection guidance, system design review, and drawing confirmation.
We support customization of electrical parameters, mechanical dimensions, mounting styles, and special features like smart interfaces.
With experience shipping to over 30 countries, we manage flexible logistics (sea, air, express) and handle DDP/DAP terms.
We provide 24-hour inquiry response, installation manuals/videos, on-site training, and a dedicated technical hotline for troubleshooting.
Choosing the right Current Transformer is a critical decision that impacts the safety, efficiency, and reliability of your entire electrical system. With Jinhand, you partner with a proven China manufacturer, supplier, and factory that combines deep technical expertise, stringent quality control, and a customer-centric approach. Our diverse range of Current Transformers — from economical integrated models to high-end, custom-engineered solutions — ensures you find the perfect fit for your project's specific needs and budget.
Contact Jinhand Electric Co., Ltd. today to request detailed specifications, a competitive quotation, or discuss your custom Current Transformer requirements. Let our decade of innovation and excellence power your projects forward.
