In modern industrial automation, power quality monitoring, and renewable energy systems, accurate current measurement is the foundation of efficiency, protection, and data‑driven decision‑making. Traditional current transformers (CTs) often struggle with magnetic saturation, limited bandwidth, bulky size, and difficult installation – especially in retrofit projects or high‑current scenarios.
Rogowski coils overcome these limitations. Their air‑core design eliminates saturation, provides a wide frequency response (from a few Hz to MHz), and offers a flexible, lightweight structure that can be installed around existing cables without interrupting power. This makes them the preferred choice for engineers and system integrators worldwide.
We offer three Rogowski coil series – WRC, RV, and RN-XL – each engineered for a specific class of applications. Below is a detailed look at what makes each series unique and how to choose the right one for your project.
WRC Series: High‑Accuracy Online Monitoring with Direct System Integration
The WRC series is built for permanent, continuous, high‑precision current monitoring in industrial and commercial facilities.
WRC-100
Key technical features:
- Accuracy: ±0.5% (system‑level, including integrator)
- Current range: 0.5A – 200kA (wide dynamic range, from low load currents to fault currents)
- Frequency response: 5Hz – 5kHz (covers fundamental, harmonics up to the 100th, and typical switching frequencies)
- Output options: 4‑20mA (loop‑powered) or RS‑485 (Modbus‑RTU) – no external integrator needed
- Installation: Flexible, wrap‑around design; length can be customized for large busbars or small cables
- Operating temperature: -20°C to +70°C
- Certifications: CE, RoHS
What makes WRC stand out:
It is a plug‑and‑play solution for energy management systems (EMS), SCADA, PLCs, and building automation. The integrated electronics directly output a standardized signal, saving engineering time and reducing component count. This makes the WRC ideal for:
- Motor condition monitoring and predictive maintenance
- Machine‑level energy tracking in manufacturing plants
- Compressor, pump, and fan efficiency analysis
- Sub‑metering in data centers and commercial buildings
If you need reliable, long‑term current data without designing a separate signal conditioning circuit, the WRC is your best choice.
RV Series: All‑Purpose High‑Current Measurement – The Workhorse
The RV series is our most versatile Rogowski coil, designed to handle a vast majority of industrial and power distribution applications. It strikes an excellent balance between performance, robustness, and cost‑effectiveness.
Key technical features:
- Accuracy: ±1% (reading)
- Current range: 10A – 300kA (from load current to severe fault current)
- Frequency response: 10Hz – 1MHz (captures up to the 400th harmonic, ideal for power quality analysis)
- Output: Standard AC voltage (e.g., 80mV@1000A at 50Hz) – requires an external integrator or connection to instruments with built‑in integration
- Optional features: Electrostatic shielding for superior external magnetic field rejection
- Coil flexibility: Standard lengths (300mm, 500mm, 700mm, 1000mm); custom lengths available on request
- Operating temperature: -20°C to +70°C
- Certifications: CE, RoHS
Why RV is the go‑to choice for system integrators:
- No power interruption needed – wrap the coil around existing cables or busbars without shutting down the panel.
- Excellent anti‑interference – the optional shielding ensures accurate measurements even in crowded switchgear with strong magnetic fields from adjacent phases.
- Wide application range:
- Retrofit energy monitoring in distribution cabinets
- Power quality analyzers (harmonics, flicker, transients)
- Switchgear protection and fault recording
- High‑current testing (e.g., welding equipment, electrolytic cells)
- Renewable energy: wind turbine output monitoring, PV inverter testing
The RV series is the workhorse you can stock for most customer needs – from a simple ammeter retrofit to a sophisticated power quality study.
RN-XL Series: Ultra‑Flexible High‑Frequency Specialist for R&D and Power Electronics
The RN-XL is a specialized tool for engineers working with high‑speed switching power supplies, wide‑bandgap semiconductors, and RF current measurements. Its extremely thin profile and ultra‑wide bandwidth set it apart.
Key technical features:
- Accuracy: ±2% (typical – optimized for waveform shape and timing, not absolute low‑current accuracy)
- Current range: 10A – 300kA
- Frequency response: 10Hz – 20MHz (captures nanosecond transients)
- Coil cross‑section: Only φ1.6mm – can fit through TO‑220, TO‑247, and even smaller device leads
- Output: Custom integrator options (e.g., ±5V, ±10V) – can be tailored to your oscilloscope or data acquisition system
- Low insertion impedance: Negligible impact on the circuit under test
- Operating temperature: -20°C to +70°C
- Certifications: CE, RoHS
Where RN-XL excels (unique applications):
- Double‑pulse testing of SiC and GaN MOSFETs – measure fast switching currents with minimal loop inductance.
- High‑frequency power supply design (resonant converters, class‑E amplifiers) – verify current waveforms at MHz switching frequencies.
- EMI debugging – identify common‑mode or differential‑mode current paths with a flexible, low‑invasive probe.
- Semiconductor device characterization – capture di/dt during turn‑on/turn‑off events.
- Inverter motor drive development – analyze high‑frequency bearing currents or leakage paths.
If your work involves third‑generation semiconductors, MHz switching, or lab‑grade current waveform analysis, the RN-XL is the only coil in our lineup that can keep up. Its ultra‑thin profile also makes it invaluable for retrofitting inside densely packed equipment where even a 5mm coil cannot pass.
How to Choose the Right Series – A Quick Summary
| If your priority is… | Choose |
|---|---|
| Direct connection to PLC/EMS without extra signal conditioning | WRC (4‑20mA or RS‑485) |
| Retrofitting existing panels, measuring up to 300kA, good accuracy at low cost | RV (standard AC output) |
| Measuring high‑frequency switching currents (MHz range) or fitting into tiny gaps | RN-XL (φ1.6mm, 20MHz bandwidth) |
| Long‑term permanent installation with data logging | WRC |
| Power quality / harmonic analysis up to the 400th order | RV (with shielding) |
| R&D lab, SiC/GaN double‑pulse test, EMI troubleshooting | RN-XL |
All three series share key advantages:
- No magnetic saturation – accurate even during fault currents.
- Flexible, non‑invasive installation – wrap around existing cables without powering down.
- Lightweight and compact – fits in crowded electrical cabinets.
- Customizable – coil length, lead length, output scaling, and special connectors available for OEM orders.
About Us
We are an experienced manufacturer specializing in smart energy meters and Rogowski coils for industrial IoT, power monitoring, and renewable energy applications. Our products are exported to markets worldwide and trusted by system integrators, facility managers, and R&D engineers.
What sets us apart:
- In‑house R&D – we design both the coils and the integrating electronics, ensuring perfect matching.
- Strict quality control – each coil is calibrated and temperature‑compensated before shipment.
- Localized support – technical guidance from pre‑sales to post‑installation.
- OEM/ODM capabilities – custom lengths, output types, connectors, and even fully integrated meters with our coils.
Whether you need a single sample for a lab test or a thousand units for a large‑scale energy monitoring project, we are ready to support you.
Optimize Your Current Measurement Solution Today
Choosing the right Rogowski coil means more accurate data, more reliable systems, and lower total cost of ownership. Contact us to request samples, technical datasheets, or a one‑on‑one consultation. Our engineering team will help you match the correct WRC, RV, or RN-XL to your specific application – from a factory floor to a semiconductor lab.
Let’s measure smarter.