FRC Series Flexible Rogowski Coil Current Transducer —Making Every Current Measurement Simple, Accurate, and Unrestricted

1. From “Coil” to “Measurement”  

Traditional current transducers rely on heavy iron cores, limiting their size, frequency response, and ease of installation. The FRC series replaces the bulky core with a lightweight, flexible coil based on the Rogowski principle. It retains the high accuracy of a conventional current transformer while breaking through the constraints of size, bandwidth, and mounting. By pairing the coil with your own integrator or amplifier, you obtain a wide-range, highly linear output from ampere to hundreds of kiloamperes.

2. Why Choose FRC?  

 Wide Range: One coil covers everything from a few amperes to hundreds of kiloamperes.  

 High Linearity: ±0.1 % of reading from 10 % to 100 % of range.  

 Broad Bandwidth: Flat frequency response from 10 Hz to 10 MHz—perfect for harmonics, transients, and DC ripple.  

 Coreless Design: No saturation, no hysteresis loss, constant 90° phase shift—measurement remains pure.  

 Non-Intrusive: The coil draws no power and generates no heat; open-circuit operation is completely safe.  

 Flexible Installation: Six lengths and six inner diameters to choose from; a quick-lock bayonet fastener lets you wrap   the coil around large or awkwardly shaped conductors—even in tight spaces.

3. Typical Applications  

 Laboratory precision measurements with oscilloscopes and power analyzers  

 Grid harmonics and transient monitoring—up to the 50th harmonic clearly visible  

  Ultra-high-current monitoring for steel arc furnaces and electrolytic cells  

 Power-quality and power-control systems—real-time feedback for SVG, APF, UPS  

  DC-ripple testing in PV converters and EV chargers  

 Relay protection—fast, reliable, no false trips

4. Product Details at a Glance  

Coil  

Lengths: 210 mm / 350 mm / 420 mm / 510 mm / 600 mm / 800 mm  

Inner diameters: 60 mm / 103 mm / 125 mm / 155 mm / 180 mm / 245 mm (±10 %)  

Cross-section: 6.5 ±0.2 mm / 8 ±0.2 mm / 10 ±0.2 mm  

Material: UL94-V0 thermoplastic elastomer—flame-retardant, oil-resistant, abrasion-resistant  

Colors: standard black, red, yellow, blue; custom colors available

Connection Cable  

Type: 3-wire lead or BNC oscilloscope interface  

Length: 3 m standard; custom lengths on request  

Material: Xy23/0.1 Ts/2C+A+B—flexible, interference-resistant  

Color: black 

Electrical Performance  

Output: 40 mV / 80 mV / 100 mV per 1000 A @50 Hz (RMS)  

Accuracy Class: 1.0 (calibration with integrator/amplifier and load impedance required)  

Conductor-position error: ≤ ±2 %  

External field influence: ≤ ±2 %  

Operating temperature: –20 °C to +75 °C  

Storage temperature: –30 °C to +75 °C (room temperature recommended for long-term storage)

5. In Summary  

Whether you are measuring milliamps in the lab or hundreds of kiloamperes on the factory floor, the FRC series Rogowski coil delivers rock-solid results in a feather-light package. Leave the complexity to the coil and give simplicity back to the engineer—that is the promise of FRC.