NFCT Series New Fluxgate Current Transducers
New Fluxgate closed-loop current transducer technology (not Hall-effect)
Primary current range from 10 mA to 100 kA
Accuracy to ±0.1% with linearity to ±0.01% and thermal drift as low as ±10 ppm
Offset current as low as ±50 µA
Long-term stability to ±0.1% and repeatability to ±0.1% with MTBF up to 5 years
Supply voltage options: +5 V, ±5 V, +12 V, +15 V, ±15 V, +24 V, ±24 V
Tolerance grades: ±0.01%, ±0.05%, ±0.1%, ±0.5%, and ±1%
Temperature grades: Commercial, Industrial, Automotive, and Military
Multiple case types (A through K) and connector options including Molex, PCB pin, and Yeon Ho
Korea Patent 10-1329240; PCT Patent pending
What are the NFCT Series New Fluxgate Current Transducers?
The NFCT is a closed-loop current transducer developed by RARA Electronics Corporation using a proprietary New Fluxgate detection principle, protected under Korean Patent 10-1329240 with a PCT application pending. Unlike conventional Hall-effect current sensors, the NFCT uses a fluxgate controller in combination with a compensation winding and magnetic core to achieve zero-flux detection. The fluxgate circuit continuously monitors the magnetic core for saturation, driving a compensation current through the secondary winding to cancel the flux produced by the primary current. The measured output is derived from this compensation current rather than from the Hall voltage, eliminating the offset instability, sensitivity drift, and temperature dependence that are inherent limitations of Hall-effect devices.
This closed-loop fluxgate architecture delivers significantly superior metrological performance compared to Hall-based alternatives. Accuracy grades of ±0.1% to ±0.4% are available, with corresponding linearity figures as low as ±0.01% and thermal drift from ±10 ppm per degree. Offset current is as low as ±50 µA in the highest-accuracy grade, and long-term stability is specified at ±0.1% over a five-year period for the premium grade. Repeatability matches the stated accuracy grade, ensuring that successive measurements remain consistent without recalibration. These characteristics make the NFCT suitable for applications where conventional sensors introduce unacceptable measurement uncertainty over temperature or time.
The product family spans primary current ratings from 10 mA to 100 kA, with turn ratios from 100 to 4000 turns configured to suit the chosen current range and burden resistor. Case types range from compact through-hole formats for low current variants up to large busbar-compatible housings for multi-kiloampere ratings. Supply voltage options cover single-rail and dual-rail configurations from ±5 V to ±24 V. Connector styles include Molex 5045 and 53259 series, PCB pin, and Yeon Ho types. Four temperature grades — Commercial, Industrial, Automotive, and Military — are offered, enabling the same transducer technology to be specified across a broad range of operating environments and qualification requirements.
NFCT Series New Fluxgate Current Transducers Specifications
A practical overview for engineers and procurement teams evaluating resistive solutions.
Series NFCT
Product group Current Sensor
Description
Fluxgate type Current Sensor
Power Rating 5V~24V
Resistance (Ω) 10mA~100kA
Tolerance (%) 0.01~1
Applications of the NFCT Series New Fluxgate Current Transducers
Where RARA current sensors are deployed in the field.
Precision power metering and energy management systems — high-accuracy billing and monitoring where Hall-effect drift is unacceptable
Industrial motor drives and servo amplifiers — closed-loop current feedback for torque and speed control requiring tight offset and linearity
Welding equipment and electrochemical processing — high-current DC measurement in environments with strong magnetic interference
Battery test and formation systems — precise charge and discharge current measurement for cell characterisation and state-of-health monitoring
Renewable energy inverters and grid-tied converters — low-drift current sensing for maximum power point tracking and harmonic analysis
Automotive and electric vehicle powertrain testing — high-precision current measurement on motor controllers and on-board chargers
Aerospace and defence power systems — military-grade variants for avionics, ground support, and shipboard power distribution
Scientific instrumentation and laboratory power supplies — sub-milliamp primary sensing for calibration, research, and test equipment
Substations and high-current distribution switchgear — kiloampere-range transducers for protection relaying and power quality analysis
Related Products of the NFCT Series New Fluxgate Current Transducers
Series CB350
Product group Current Sensor
Description
Shunt Based Current Sensor
Power Rating ≤216mW @12VDC
Rated Current -350A~+350A
Supply voltage 6VDC~18VDC
Resistance (Ω) 50u
Tolerance (%) 0.5
Series CB600
Product group Current Sensor
Description
Shunt Based Current Sensor
Power Rating ≤384mW @12VDC
Rated Current -600A~+600A
Supply voltage 6VDC~18VDC
Resistance (Ω) 50u
Tolerance (%) 0.1(Max)
Series CB1000
Product group Current Sensor
Description
Shunt Based Current Sensor
Power Rating ≤384mW @12VDC
Rated Current -1000A~+1000A
Supply voltage 6VDC~18VDC
Resistance (Ω) 25u
Tolerance (%) 0.1(Max)
Why Choose RARA Current Sensors
What sets RARA apart for engineers and procurement managers in industrial and automotive markets.
01
Two Technologies
Shunt-based sensors for compact, direct EV battery measurement and fluxgate sensors for isolated ultra-high current applications — both from a single IATF 16949 certified supplier..
02
EV-Ready Design
CB-series sensors operate on 6–18VDC — the standard supply range of automotive BMS systems — with bidirectional ±current output and ultra-low 25–50μΩ shunt resistance that minimizes power loss in the high-current battery path.
03
Extreme Range Coverage
From 10mA precision measurement to 100kA industrial monitoring — the NFCT fluxgate sensor covers a dynamic range that no single shunt solution could match, with galvanic isolation for high-voltage safety.
04
Global Track Record
Trusted by Tesla, GM Korea, Proterra, and leading EV manufacturers — RARA current sensors are deployed in EV battery packs, charging infrastructure, and industrial power systems across six continents.
