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Current Transformer

A Current Transformer, or CT, is a device used to measure alternating current in electrical systems safely and accurately. It converts high current into a lower standardized output for meters, relays, and monitoring equipment. Current transformers are widely used in power distribution, industrial automation, and energy management systems.


CTs provide electrical isolation, improving operational safety and reliability. Modern current transformers feature compact size, high accuracy, stable performance, and long service life. They are commonly used in switchboards, smart meters, renewable energy systems, and electrical protection equipment.

Key Benefits

Expert Design

Strong R&D manufacturers create high-precision current transformers with optimized structure, higher accuracy and flexible customization for industrial & energy use.

Electrical Isolation

CTs isolate high voltage circuits from measuring instruments, improving operator safety and protecting monitoring equipment from electrical damage and system faults.

Strong Output

Factories with automated production lines ensure large scale output, stable quality control, fast delivery time, and reliable supply for global customers and bulk orders.

Stable Performance

Current transformers offer reliable long-term operation with low maintenance, maintaining stable measurement performance under different environmental and load conditions.

Applications

Current transformers are widely used in industrial automation, power distribution systems, and renewable energy equipment for accurate current monitoring and protection.

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Renewable Energy Monitoring

Current transformers are widely applied in solar power systems, wind energy equipment, battery energy storage systems, and smart grid projects for accurate current measurement, energy monitoring, and electrical protection. They help monitor power consumption and system performance in real time, improving renewable energy management efficiency and operational reliability.


Modern current transformers feature high accuracy, excellent electrical isolation, compact structure, low power consumption, and stable long term performance.

They ensure safe operation of renewable energy systems by preventing overloads and enabling precise power flow control across different applications.

Industrial Automation

Current transformers play a key role in industrial automation by enabling accurate current measurement, real time monitoring, and system protection in manufacturing and control processes. They ensure safe operation through electrical isolation between high voltage circuits and control equipment.


With high accuracy, compact design, and stable performance, CTs support efficient energy management, fault detection, and reliable automation system operation. They are widely used in motor control centers, PLC systems, and smart factories. They also help improve predictive maintenance and reduce unexpected downtime in industrial environments.

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Power Grid Solutions with Current Transformers

Current transformers are essential components in smart power grids. They convert high primary current into low standard current for measurement, monitoring and protection. Featuring compact structure, high precision and stable performance, they operate reliably under complex grid conditions. With low maintenance and long service life, they ensure accurate data collection for power management. These devices effectively isolate high voltage to guarantee operational safety, helping grids run efficiently and steadily. They are widely deployed across transmission and distribution lines, becoming a reliable guarantee for safe and intelligent power supply.

Product Advantages

High Measurement Accuracy

Adopt high permeability core with low magnetic loss, tiny ratio error, stable sampling data in steady and transient current conditions.

Excellent Insulation Performance

Integral epoxy resin encapsulation, high voltage resistance, moisture and dust proof, fit various complex electrical environments.

Strong Anti-interference Ability

Optimized internal winding layout shields electromagnetic interference, ensures stable signal transmission in strong electric field.

Wide Installation Compatibility

Various aperture sizes and compact structure, easy wiring, suitable for most distribution cabinets and protection devices.

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Current Transformers Datasheet

  • Name
  • Update
  • Size
  • Downloads
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  • TRSK-36A.pdf
  • 2026-08-13
  • 338KB
  • 2482
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  • Copy Link
  • TRSK-50A.pdf
  • 2026-08-13
  • 334KB
  • 2557
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  • TRFK-10A.pdf
  • 2026-08-13
  • 325KB
  • 2503
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  • TRFK-16A.pdf
  • 2026-08-13
  • 328KB
  • 2513
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  • TRFK-24A.pdf
  • 2026-08-13
  • 413KB
  • 2626
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  • Copy Link
  • TRSK-24A.pdf
  • 2026-08-13
  • 393KB
  • 2480
  • Download
  • Copy Link

Company Advantage（Why choose us）

Trust our decades of experience, precision-engineered products, and dedicated support for your current measurement needs.

Expertise & Experience

With over 25 years in current transducer manufacturing, we deliver industry-leading, accurate and reliable solutions. Our deep expertise ensures top-tier quality and innovation.

Precision & Reliability

Our current transformers are engineered for high precision, stable performance and fast response. Built for demanding applications, they ensure long-term reliability even in harsh environments.

Comprehensive Support

From selection to after-sales, we offer end-to-end support. Our team provides tailored solutions to ensure seamless integration and optimal performance in your system.
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Testimonials

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James Carter

Accuracy stays rock-solid, zero drift even after years of use.

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William Brooks

Customization support is fast, fits our equipment perfectly.

Sophia Johnson

Ultra-reliable in harsh conditions, low maintenance needed.

Ethan Taylor

Great service from selection to integration—totally hassle-free.

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TR-F series split-core type outdoor waterproof current transformer (round hanging wire type), the biggest feature of this series of products is the waterproof function, which can be used outdoors. The core cut end face is sealed with silicone ring around, which can effectively prevent rainwater from infiltrating; the shell adopts ultrasonic welding one-piece molding process, and the plastic material will be wrapped and sealed in the body of the transformer; the structural parts of the core winding are cast with epoxy resin, and at the same time, the secondary side of the lead wires are sheathed, which can prevent rainwater from infiltrating into the body of the transformer. The waterproof grade can reach IP66.
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FK series open and close current transxformer,180 degrees open and close freely, indoor use. It can be quickly installed and disassembled in the state of no power failure and continuous line and the operation is simple ,Through the principle of electromagnetic induction ,the measured source is isolated from personnel and equipment ,effectively ensuring the safety of personnel and property. This series of products has a variety of apertures and specifications to meet different use and installation needs.
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FAQs

Q: What is a split core current transformer?
A split core current transformer (CT) is a type of current sensor designed to measure alternating current without disconnecting the circuit. Unlike solid core CTs, it has a hinged or separable core that can be easily opened and clamped around an existing conductor, making installation quick and non-intrusive. It works by transforming the high current flowing through the conductor into a smaller, proportional current for monitoring and metering. Split core current transformer(CTs) are widely used in energy management, power monitoring, and protection systems. They are ideal for retrofitting existing electrical systems, offering convenience, accuracy, and safety in applications such as smart grids, building energy management, and industrial automation.
Q: What is the current transformer(CT) working principle?
The working principle of a current transformer (CT) is based on electromagnetic induction. When alternating current flows through the primary conductor, it generates a magnetic field around it. This magnetic flux passes through the CT’s magnetic core and induces a proportional current in the secondary winding. The secondary current is a scaled-down version of the primary current, allowing safe measurement and monitoring of high currents without directly connecting measuring instruments to the power line. CTs are essential in metering, monitoring, and protection within electrical power systems.
Q: What is the difference between CBCT and CT transformer?
A Current Transformer (CT) and a Core Balance Current Transformer (CBCT) are both used for current measurement and protection, but they serve different purposes. A CT measures the current in a single conductor by stepping it down to a safer, measurable level, often used for metering and protection. A CBCT, also called a zero-sequence CT, surrounds all three phase conductors (and sometimes neutral) together. It detects imbalance or leakage currents, mainly for earth fault protection. In short, CT focuses on measuring line current, while CBCT focuses on detecting ground faults.
Q: What is Rogowski coil used for?
A Rogowski coil is a specialized device designed to measure alternating currents (AC), especially where accuracy, safety, and wide dynamic range are required. Unlike traditional current transformers, it is built without a ferromagnetic core, making it lightweight, flexible, and free from magnetic saturation. These unique characteristics make Rogowski coils highly valuable across industries where monitoring and analyzing electrical current is essential.
Q: What are the main products of Hubei Tianrui Electronics Co., Ltd.?
Founded in 1998, Tianrui Electronics is a power signal acquisition and transmission solution provider integrating scientific research, production, sales and service. The main products include: current transformer, current sensor, Rogowski coil, Digital panel meter etc.

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For inquiries or support, please contact our dedicated team.

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