CB1000 Series Automotive Shunt-Based Current Sensor
Bidirectional DC current measurement with high accuracy (±0.1% max)
Rated current range: 350A, 600A, and 1000A variants
Low-TCR shunt resistor element with high-precision ADC
CAN 2.0 A/B communication protocol with configurable ID and speed (125 kbps to 1 Mbps)
Supply voltage 6 V to 18 V DC; power consumption ≤384 mW at 12 VDC
Operating temperature range −40°C to +105°C
Galvanic isolation rated at 1500 VAC between high- and low-voltage ends
Current measurement resolution: 1 mA; temperature measurement resolution: 0.1°C
Tolerance options: ±0.05%, ±0.1%, ±0.2%, ±0.5%, and ±1%
Automotive-grade qualification to VW 80000 and ISO standards
What are the CB1000 Series Automotive Shunt-Based Current Sensors?
The CB1000 is an automotive-grade current sensing module designed for accurate, bidirectional DC current measurement in high-voltage battery and power systems. Built around a low-TCR shunt resistor, the sensor integrates a high-precision analogue-to-digital converter and digital signal processing to deliver current measurements with a maximum accuracy of ±0.1% across the full operating temperature range of −40°C to +105°C. The architecture combines the low-impedance shunt element with galvanic isolation between the high-voltage sensing circuit and the low-voltage communication interface, enabling safe installation at either the positive or negative main electrode of a battery system.
Current data is transmitted over a CAN 2.0 A/B bus at a default rate of 500 kbps, with selectable speeds from 125 kbps to 1 Mbps. The CAN identifier and data frame format are configurable, with four frame formats available: Format A and Format B each transmit current and temperature in separate frames, while Format C combines both in a single frame, and Format D transmits current only. The sensor supports two measuring modes — a time-interval mode that sends data at a fixed rate whilst also responding immediately to command triggers, and a command-triggered mode in which the sensor transmits data only when requested by the host. Response delay from trigger receipt to data transmission is less than 5 ms in both modes.
The CB1000 is available in three rated current variants — 350 A, 600 A, and 1000 A — with shunt resistance values of 25 µΩ and lower, depending on the specific configuration. The module is housed in a compact enclosure with copper bar connection terminals on the high-voltage side and a four-pin Molex connector on the low-voltage side carrying CAN_H, CAN_L, VCC, and GND. Recommended copper bar overlap and torque specifications are defined to ensure consistent contact resistance and long-term mechanical stability. The sensor meets the full suite of VW 80000 electrical load, climatic, and mechanical qualification tests, as well as applicable ISO electromagnetic compatibility and ESD standards, confirming suitability for series production automotive applications.
CB1000 Series Automotive Shunt-Based Current Sensor Specifications
A practical overview for engineers and procurement teams evaluating resistive solutions.
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)
Applications of the CB1000 Series Automotive Shunt-Based Current Sensor
Where RARA current sensors are deployed in the field.
Automotive battery management systems — main current monitoring on high-voltage battery positive or negative electrode
Electric vehicle on-board chargers — precise charge and discharge current sensing for state-of-charge estimation
Hybrid and battery-electric drivetrains — real-time current reporting for motor controller and power distribution units
Grid energy storage systems — bidirectional current measurement in high-voltage battery racks and energy management systems
Uninterruptible power supply systems — continuous current monitoring for battery health and load management
Electric vehicle charging stations — accurate current metering for billing accuracy and protection functions
Industrial power conversion equipment — CAN-connected current feedback in inverters and DC-DC converters
Renewable energy systems — photovoltaic and wind power storage integration with real-time current telemetry
Related Products of the CB1000 Series Automotive Shunt-Based Current Sensor
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 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..
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.
