Current Sensing
Sensors
±350A – ±1000A
CB Series Range
CB Series Range
10mA – 100kA
NFCT Fluxgate Range
NFCT Fluxgate Range
6V – 24V
Supply Voltage
Supply Voltage
2 Categories
Technologies
Technologies
Technologies:
Shunt-Based
l
Fluxgate
l
Bidirectional
l
STEP Files Available
What Is a Current Sensor?
A practical overview for engineers and procurement teams evaluating resistive solutions.
A
current sensor
is an integrated measurement module that detects and outputs a signal proportional to the current flowing through a conductor — without requiring the circuit to be broken or modified beyond inserting the sensor in line. Unlike a bare shunt resistor that outputs a raw millivolt
signal, a current sensor module includes signal conditioning, amplification, and output circuitry
in a single package, simplifying integration into battery management systems, motor controllers, and power monitoring equipment.
RARA offers two current sensor technologies. Shunt-based current sensors (CB350, CB600, CB1000) use a precision low-resistance shunt element combined with an integrated signal conditioning circuit — delivering a calibrated voltage output proportional to current, with bidirectional measurement capability (both charge and discharge) across ±350A to ±1000A. These are supplied at 6–18VDC and are purpose-designed for EV battery pack current monitoring.
The NFCT fluxgate current sensor operates on a fundamentally different principle — measuring the magnetic field generated by current in a conductor, with no electrical contact with the measured circuit. This gives fluxgate sensors extremely wide measurement range from 10mA to 100kA, galvanic isolation, and tolerance for high-voltage environments where direct shunt measurement would be impractical or unsafe.
RARA offers two current sensor technologies. Shunt-based current sensors (CB350, CB600, CB1000) use a precision low-resistance shunt element combined with an integrated signal conditioning circuit — delivering a calibrated voltage output proportional to current, with bidirectional measurement capability (both charge and discharge) across ±350A to ±1000A. These are supplied at 6–18VDC and are purpose-designed for EV battery pack current monitoring.
The NFCT fluxgate current sensor operates on a fundamentally different principle — measuring the magnetic field generated by current in a conductor, with no electrical contact with the measured circuit. This gives fluxgate sensors extremely wide measurement range from 10mA to 100kA, galvanic isolation, and tolerance for high-voltage environments where direct shunt measurement would be impractical or unsafe.
Construction Technologies
-Shunt-based (CB350, CB600, CB1000)
-Fluxgate (NFCT series)
-Bidirectional measurement (both technologies)
-Calibrated voltage output
-STEP 3D files available (CB series)
-Shunt-based (CB350, CB600, CB1000)
-Fluxgate (NFCT series)
-Bidirectional measurement (both technologies)
-Calibrated voltage output
-STEP 3D files available (CB series)
Key Advantages
-Integrated signal conditioning — no external -circuitry needed
-Bidirectional ±current measurement
-Wide range: 10mA to 100kA (NFCT)
-Compact form factor for EV BMS integration
ISO 9001 & IATF 16949 certified manufacturer
-Integrated signal conditioning — no external -circuitry needed
-Bidirectional ±current measurement
-Wide range: 10mA to 100kA (NFCT)
-Compact form factor for EV BMS integration
ISO 9001 & IATF 16949 certified manufacturer
RARA current sensors combine precision shunt technology and fluxgate sensing — two complementary technologies covering everything from compact EV battery measurement to ultra-high current industrial monitoring.
Applications
Where RARA current sensors are deployed in the field.
EV Battery Management Systems
The CB350, CB600, and CB1000 shunt-based sensors are specifically designed for EV battery pack current monitoring — measuring bidirectional charge and discharge current continuously to support accurate state-of-charge calculation. The 6–18VDC supply range and compact form factor suit integration directly into battery management unit (BMU) enclosures.
The CB350, CB600, and CB1000 shunt-based sensors are specifically designed for EV battery pack current monitoring — measuring bidirectional charge and discharge current continuously to support accurate state-of-charge calculation. The 6–18VDC supply range and compact form factor suit integration directly into battery management unit (BMU) enclosures.
EV Charging Infrastructure
DC fast chargers and AC charging stations require accurate current measurement across the full charging current range. The CB1000 (±1000A, 25μΩ) and CB600 (±600A, 50μΩ) sensors provide the bidirectional measurement and low resistance needed to monitor charging current with minimal power loss in the current path.
DC fast chargers and AC charging stations require accurate current measurement across the full charging current range. The CB1000 (±1000A, 25μΩ) and CB600 (±600A, 50μΩ) sensors provide the bidirectional measurement and low resistance needed to monitor charging current with minimal power loss in the current path.
Industrial Motor Control
Variable frequency drives, servo controllers, and soft starters need precise current feedback for torque control and overload protection. Shunt-based CB sensors provide a clean, conditioned output signal that interfaces directly with drive controller ADC inputs — simplifying design compared to using a bare shunt resistor with a separate amplifier circuit.
Variable frequency drives, servo controllers, and soft starters need precise current feedback for torque control and overload protection. Shunt-based CB sensors provide a clean, conditioned output signal that interfaces directly with drive controller ADC inputs — simplifying design compared to using a bare shunt resistor with a separate amplifier circuit.
Renewable Energy & Grid Monitoring
The NFCT fluxgate sensor (10mA–100kA, tolerance 0.01–1%) covers the full current range needed in solar inverters, wind turbine power converters, and grid-tie systems — from small rooftop installations to utility-scale power monitoring where direct shunt measurement at high voltages would require costly isolation.
The NFCT fluxgate sensor (10mA–100kA, tolerance 0.01–1%) covers the full current range needed in solar inverters, wind turbine power converters, and grid-tie systems — from small rooftop installations to utility-scale power monitoring where direct shunt measurement at high voltages would require costly isolation.
Rail & Heavy Industry
Traction systems, cranes, and heavy industrial equipment operate at very high currents where fluxgate sensing is preferred over shunt methods. The NFCT series handles up to 100kA — covering the largest industrial current measurement requirements with galvanic isolation from the high-voltage traction circuit.
Traction systems, cranes, and heavy industrial equipment operate at very high currents where fluxgate sensing is preferred over shunt methods. The NFCT series handles up to 100kA — covering the largest industrial current measurement requirements with galvanic isolation from the high-voltage traction circuit.
Energy Storage & Testing
Battery test systems, energy storage systems (ESS), and power cycling test equipment require accurate bidirectional current measurement across wide dynamic ranges. The combination of CB-series shunt sensors for moderate currents and NFCT fluxgate for high-range measurement covers the full spectrum of battery and energy storage test requirements.
Battery test systems, energy storage systems (ESS), and power cycling test equipment require accurate bidirectional current measurement across wide dynamic ranges. The combination of CB-series shunt sensors for moderate currents and NFCT fluxgate for high-range measurement covers the full spectrum of battery and energy storage test requirements.
Product Series
Select models from our current sensors lineup. Download individual datasheets for full specifications, dimensions, and ordering codes.
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)
Series NFCT
Product group Current Sensor
Description
Fluxgate type Current Sensor
Power Rating 5V~24V
Resistance (Ω) 10mA~100kA
Tolerance (%) 0.01~1
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..
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.
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.
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.
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.
Products & Downloads
Information & Schedule
100B-11L, 138 Cheongneung-
daero 410beon-gil,
Namdong-gu, Incheon
TEL : +82-70-4355-4327
FAX : +82-32-817-4328
Email: osm1@raraohm.com
daero 410beon-gil,
Namdong-gu, Incheon
TEL : +82-70-4355-4327
FAX : +82-32-817-4328
Email: osm1@raraohm.com
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