Solid-core CT

A closed-core, one-piece CT installed by routing the cable or busbar through the transformer. It delivers high accuracy and stability for revenue metering and power quality monitoring, but installation may require disconnecting wiring.

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Revenue Grade CTs - A New Standard for Precision Measurement

1. Description

Revenue Grade CTs is a high-accuracy, externally mounted current transformer that installs directly on the primary conductor to measure energy (kWh) and power quality with revenue-grade precision. Designed for utility-grade and commercial metering applications, RGCT delivers reliable, repeatable measurements for billing, submetering, and advanced electrical analytics.

The RGCT series complies with both major global metering standards IEC 61869-2 (accuracy classes 0.2S, 0.5S) and IEEE C57.13 (accuracy classes 0.15S, 0.3S) making it a core sensor for high-precision metering systems. Even the best power meter cannot maintain system accuracy if the CT accuracy is insufficient; CT performance ultimately determines the trustworthiness of the entire measurement chain.

For commercial billing, revenue-grade energy metering, and high-resolution power quality monitoring, a proven RGCT is essential to ensure compliance, reduce measurement errors, and protect revenue integrity.

2. Why CT Accuracy Matters

To achieve the full performance of a high-precision power meter, you need a current transformer (CT) with equal or higher accuracy. The overall accuracy of an electrical metering system (system accuracy) is ultimately limited by the lowest-accuracy component in the measurement chain. 

That means even if you install a premium, revenue-grade meter, using a lower-accuracy CT will reduce the entire billing accuracy to the CT’s level. In commercial billing and revenue-grade energy metering, CT accuracy directly impacts measurement reliability, billing integrity, and the value you get from your metering investment.

Case A (Bad Match) Case B (Perfect Match) Results and Benefits
Class 0.2 meter + Class 0.5 standard CT 0.2-class meter + 0.2S-class RGCT Final 0.5-class system (wasting meter performance)
0.2-class meter + 0.2S-class RGCT Final 0.2-class system (precise billing possible) -

Our RGCT series guarantees the highest precision that your meter can deliver, enabling error-free billing and reliable data collection.

3. Applications 

This product connects to the following equipment and ensures the reliability of energy and power quality measurements. 

  • Applicable equipment: Power Meters, Energy Meters, Power Quality Meters
  • Measurement purposes
    • Energy Measurement: IEC/ANSI-compliant active energy measurement and settlement for commercial billing.
    • Power Quality Measurement: Provides high-sensitivity signals for analyzing detailed power quality data such as harmonics and voltage/current imbalance.

4. Model Configuration (Model Selection: RGCT Series)

You can select the optimal model according to the input method of the meter in use.

A. Standard Current Output (Standard Current Output Model)
This is an industry-standard model that fully supports the accuracy of standard power meters and PQAs. 

Category Specifications Features
Output 5A, 1A For connection to standard measuring instruments
Termination Final 0.2-class system (precise billing possible) Excellent at maintaining accuracy when transmitting high-current signals
Wire Lead Type: Lead-wire outlet type For connection to standard measuring instruments

B. Voltage & Plug-in Output (Voltage and Plug-in Model)
A safe, convenient, high-precision solution for the latest digital meters and smart measuring

Category Specifications Features
Output 333mV, 225mV, 100mA Dedicated to plug-in energy meters; enhanced safety
Termination RJ12 / RJ45: Plug-and-play (plug-in) connection Prevents miswiring and reduces installation time
Terminal Type: Robust screw-tightened terminal block No overvoltage risk when opened (Safe)
Wire Lead Type: Lead-wire outlet type -

DC-Tolerant CTs (High-Performance DC-Tolerant Current Transformers)

1. Product Overview

DC-Tolerant CTs are specialized current transformers designed to fundamentally prevent magnetic saturation of the CT core that can occur when a DC component is superimposed in an AC system or when the CT is exposed to an external DC magnetic field.
By maximizing reliability in measurement environments, this product serves as a key sensor that ensures both the accuracy of energy measurement and the speed of system protection.

2. Key Applications & Value (Key Applications & Value)

This CT is an essential built-in component inside energy meters and protective relays in environments where there is a constant risk of DC infeed.

Application area Applied device Essential value of a DC-immune CT
Distributed generation & EV EV charger meter, solar/ESS inverter Prevents DC components generated during inverter operation or charging from causing metering errors,
thereby maintaining the accuracy (Revenue Grade) of generation and transaction-volume measurements.
Smart metering Electrical energy smart meter In the event of fraudulent metering (Anti-Tamper) attempts using external magnets or tethers,
it prevents measurement errors caused by DC components, securing and maintaining billing accuracy.
Grid protection Protective relay Ensures that the CT does not saturate even under asymmetrical current (DC Offset) generated
during grid faults, securing reliability so the relay can judge accurately and operate quickly.

3. Standards & Accuracy (Standards & Accuracy) 

This CT meets strict international standards and satisfies performance in both key areas.

  • Energy meter standard: Meets IEC 62053-21 accuracy Class 1 and Class 0.5S, satisfying the precision metering requirements for EV and smart meters.
  • Protective relay standard: Meets the protection-class requirements of IEC 61869-2 and IEEE C57.13, ensuring stable relay operation even under DC offset conditions.


Specification

New JDTN Series for 0.5/1.0 Class Meter Grade

Model Download Primary Current Range Error Turns
Ratio		 Characteristical Value Terminal
Structure		 Inner
Dia.Ø
Imax
[Mrms]		 Îpeak
[A0p]		 Phase
Ø(I)[˚]		 L
[H]		 Rcu
[Ω]		 RB
[Ω]		 UB
[Vrms]
JDTN20V 📁 20 20 4.00 1:2500 7.4 138 25 0.2 Pin 7
JDTN40V 📁 40 40 3.96 1:2500 4.48 93 5 0.08 Pin 8
JDTN60V 📁 60 80 4.94 1:2500 2.84 65 12.5 0.3 Pin 8
JDTN100V 📁 100 110 4.08 1:2500 3.1 62 7.5 0.3 Pin 10.8
JDTN120V 📁 120 120 3.83 1:2500 3.22 55 6.25 0.3 Pin 13
JDTN20W 📁 20 20 4.00 1:2500 7.4 138 25 0.2 Wire 7
JDTN40W 📁 40 40 3.96 1:2500 4.48 93 5 0.08 Wire 8
JDTN60W 📁 60 80 4.94 1:2500 2.84 65 12.5 0.3 Wire 8
JDTN100W 📁 100 110 4.08 1:2500 3.1 62 7.5 0.3 Wire 10.8
JDTN120W 📁 120 120 3.83 1:2500 3.22 55 6.25 0.3 Wire 13

High Precision CTs

1. Product Overview

High Precision CTs are high-performance current transformers designed to maximize the performance of smart meters, power quality analyzers (PQA), and power measurement & monitoring devices (PMD). This product provides excellent linearity (High Linearity) and low phase error (Low Phase Error), enabling full compliance with the following strict global accuracy standards with only minimal calibration (Minimal Calibration)—without complex multi-point compensation.

  • Energy Metering: IEC 62053-22 (Class 0.2S / 0.5S) and ANSI C12.20 (Class 0.2 / 0.5)
  • Power Monitoring (PMD): IEC 61557-12 Edition 2.0 (2018) + AMD1 (2021)

As a result, it not only supports advanced metering, but also helps shorten development time and dramatically improve mass-production efficiency when developing high-performance PMDs where power quality analysis (Power Quality), such as harmonics, is essential.

2. Primary Configuration

You can choose the optimal model between an integrated primary conductor type and a through-hole type, depending on the design environment and current capacity.

Option Type Model Description Key Points
A Integrated Primary Type
(Integrated primary conductor)		 PCT1V, PCT3V An all-in-one model with a built-in primary conductor (Busbar/Wire) inside the CT through which the primary current flows.
  • No Hassle: Can be mounted directly onto the PCB without the hassle of selecting and assembling a separate busbar or cable.
  • Compact & Safe: Provides a small footprint optimized for tight PCB space, and safety is ensured with verified primary-to-secondary dielectric strength (Hi-Pot Test, e.g., 3.5 kV).
  • Target: Small smart meters, single-phase/three-phase energy meters.
B Through-Hole Type
(Primary conductor pass-through)		 - A flexible donut-shaped model with a central window (hole) that allows the customer’s cable or busbar to pass through.
  • Flexibility: Supports cables or busbars of various thicknesses, offering high design freedom.
  • High Current: Suitable for industrial meters requiring high-current measurement or needing to keep an existing busbar design unchanged, as well as high-capacity PMD/PQA.

3. Termination Styles 

You can select the termination method according to the automation level of the production line and the internal structure.

  • PCB Pin Type: Optimized for automated production (Pick & Place) lines; soldered directly to the PCB for strong vibration resistance and robustness.
  • Wire Lead Type: Flexible lead wires are provided, allowing placement freely without PCB layout constraints.

4. Key Advantages

“Ultimately, the meter and PMD class are determined by the CT’s linearity.”

  • Calibration Efficiency: Even across a wide current range (Wide Dynamic Range) from low current up to 120 A, phase error remains very low and consistent, enabling high-precision compliance with IEC 61557-12 (PMD) and ANSI/IEC metering standards using only simple electronic compensation.
  • Temperature Stability: Maintains stable precision even in extreme environments from -40°C to +85°C (up to +120°C depending on the model).


Specification

JP Series for 0.1/0.2 Class Meter Grade

Model Download Primary Current Range Error Turns
Ratio		 Characteristical Value Terminal
Structure		 Inner
Dia.Ø
Imax
[Mrms]		 Îpeak
[A0p]		 Phase
Ø(I)[˚]		 L
[H]		 Rcu
[Ω]		 RB
[Ω]		 UB
[Vrms]
JP3V 📁 6 - 0.1 1:2500 250 138 10 0.024 Pin 7
JP315V 📁 6 - 0.12 1:1500 90 50 10 0.04 Pin 7
JP32V 📁 6 - 0.14 1:2000 160 110 10 0.03 Pin 7
JP5V 📁 120 - 0.10 1:2500 130 55 5 0.24 Pin 13
JP51V 📁 60 - 0.21 1:1000 22 20 5 0.3 Pin 13
JP52V 📁 100 - 0.11 1:2000 85 43 5 0.25 Pin 13
JP3W 📁 6 - 0.1 1:2500 250 138 10 0.024 Wire 7
JP315W 📁 6 - 0.12 1:1500 90 50 10 0.04 Wire 7
JP32W 📁 6 - 0.14 1:2000 160 110 10 0.03 Wire 7
JP5W 📁 120 - 0.10 1:2500 130 55 5 0.24 Wire 13
JP51W 📁 60 - 0.21 1:1000 22 20 5 0.3 Wire 13
JP52W 📁 100 - 0.11 1:2000 85 43 5 0.25 Wire 13
JP62W 📁 200 - 0.10 1:2000 75 32 5 0.5 Wire 19.3
JP7W 📁 400 - 0.20 1:4000 300 170 5 0.5 Wire 30

JN Series for 0.1/0.2 Class Meter Grade

Model Download Primary Current Range Error Turns
Ratio		 Characteristical Value Terminal
Structure		 Inner
Dia.Ø
Imax
[Mrms]		 Îpeak
[A0p]		 Phase
Ø(I)[˚]		 L
[H]		 Rcu
[Ω]		 RB
[Ω]		 UB
[Vrms]
JN1V 📁 6 - 0.29 1:1500 35 46 10 0.04 Pin 5
JN2V 📁 6 - 0.46 1:1600 60 143 10 0.037 Pin 5.83
JN3V 📁 6 - 0.17 1:2500 200 138 50 0.12 Pin 7
JN315V 📁 6 - 0.18 1:1500 70 50 20 0.08 Pin 7
JN32V 📁 6 - 0.24 1:2000 120 110 50 0.15 Pin 7
JN4V 📁 40 - 0.19 1:2500 230 200 25 0.4 Pin 9
JN12V 📁 60 - 0.12 1:2500 260 150 7.5 0.18 Pin 12.2
JN8V 📁 60 - 0.10 1:2000 250 92 10 0.3 Pin 8
JN3W 📁 6 - 0.17 1:2500 200 138 50 0.12 Wire 7
JN315W 📁 6 - 0.18 1:1500 70 50 20 0.08 Wire 7
JN32W 📁 6 - 0.24 1:2000 120 110 50 0.15 Wire 7
JN4W 📁 40 - 0.19 1:2500 230 200 25 0.4 Wire 9
JN8W 📁 60 - 0.10 1:2000 250 92 10 0.3 Wire 8