CB350 (CBMA Series) Automotive Shunt-Based CAN Current Sensor
Shunt-based bidirectional DC current sensing module with integrated CAN 2.0 A/B communication
Automotive-grade design operating across −40°C to +105°C
Current measurement range ±350A continuous; tolerance options from ±0.05% to ±1%
Shunt DC impedance 45–55μΩ (nominal 50μΩ); inductance below 5nH
Integrated temperature sensing: −50°C to +150°C range, ±3°C maximum error, 0.1°C resolution
CAN bus communication at 250kbps, 500kbps or 1Mbps; configurable CAN ID and data format
Supply voltage 6VDC to 18VDC; power consumption ≤50mW at 12VDC
Galvanic isolation between high-voltage shunt circuit and low-voltage CAN interface
Qualified to VW 80000 automotive test standard; EMC tested to ISO 7637-2 and CISPR 25
Molex 4-pin connector interface; 4mm shunt thickness standard
Available with or without CAN terminal resistor (120Ω)
What are the CB350 (CBMA Series) Automotive Shunt-Based CAN Current Sensor?
The CB350 is an automotive-grade, shunt-based current sensing module from the CBMA series, designed to measure bidirectional DC current with high accuracy and report measurements digitally over a CAN 2.0 A/B bus. Built around a low-TCR precision shunt resistor with a nominal DC impedance of 50μΩ, the module integrates a high-precision analogue-to-digital converter, onboard signal conditioning, temperature compensation across the full operating range, and a galvanically isolated CAN interface into a single compact package. The result is a self-contained current measurement module that connects directly into the main current path of a battery system and communicates real-time current and temperature data to a battery management system or vehicle control unit without requiring any external signal processing hardware.
The CB350 supports a continuous operating current range of ±350A with a measurement accuracy of ±0.5% or better across the full −40°C to +105°C automotive temperature range in the high-current region, and milliampere-level resolution at low currents. Tolerance grades are available from ±0.05% (B) through to ±1% (K), allowing selection of the appropriate measurement accuracy for the application. The integrated temperature sensor provides a secondary measurement of shunt and PCB temperature with a range of −50°C to +150°C, a maximum error of ±3°C, and a resolution of 0.1°C, which the module uses for internal current compensation and can also transmit to the host system for state-of-health monitoring. Galvanic isolation between the high-voltage shunt circuit and the low-voltage CAN interface is rated at 1000VAC, enabling safe installation at either the positive or negative electrode of a high-voltage battery system.
The CAN interface operates at selectable speeds of 250kbps, 500kbps or 1Mbps and supports four configurable data frame formats. Formats A and B each transmit current and temperature in separate frames with cyclic counters and exception flags; Format C combines current and temperature in a single frame; Format D transmits current only. CAN ID is configurable, and the module supports both standard and extended frame types as well as Motorola and Intel byte ordering. Two measurement triggering modes are available: a periodic time-interval mode and a command-triggered mode in which the host BMS requests measurements on demand. Start-up time from power-on to first valid CAN message is 100–150ms. The module is qualified against a comprehensive suite of automotive electrical, climatic, and mechanical stress tests to VW 80000, ISO 7637-2, ISO 10605, CISPR 25, and ISO 11452, and is available in shunt sizes of 69×18mm, 85×18mm, 84×36mm and 85×36mm to suit different copper bus bar connection geometries.
CB350 (CBMA Series) Automotive Shunt-Based CAN Current Sensor Specifications
A practical overview for engineers and procurement teams evaluating resistive solutions.
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
Applications of the CB350 (CBMA Series) Automotive Shunt-Based CAN Current Sensor
Where RARA current sensors are deployed in the field.
Electric vehicle battery management systems — real-time bidirectional current measurement at the high-voltage battery pack for state-of-charge and state-of-health estimation
Hybrid electric vehicle powertrains — main battery current monitoring at the positive or negative electrode of the high-voltage bus
On-board EV chargers and DC fast-charging stations — charge current measurement and control with CAN reporting to the vehicle BMS
Grid energy storage systems — bidirectional current sensing for battery charge and discharge management in stationary storage applications
Uninterruptible power supplies (UPS) — accurate current monitoring for battery state estimation and load management
Industrial battery systems — high-accuracy current sensing in multi-cell packs requiring CAN-based reporting to a central controller
Automotive 48V mild-hybrid systems — current monitoring at the lithium-ion or lead-acid buffer battery
Commercial vehicle electrification — bus, truck and off-highway vehicle battery pack current monitoring with automotive-grade qualification
Fuel cell vehicle systems — current sensing at the fuel cell stack or buffer battery interface
Renewable energy inverters and converters — precision current measurement in battery-coupled DC bus systems requiring isolated digital output
Related Products of the CB350 (CBMA Series) Automotive Shunt-Based CAN Current Sensor
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..
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.
