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Current Sensors & Transducers: Accurate Current Sensing

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Current Sensors & Transducers: Accurate Current Sensing Skip to main content EN JP CN EN JP CN Check Stock Career Investors Contact Products Applications Support About Lem Search Current Sensors 45-90 A 90-180 A 187.5-375 A 375-750 A 750-1500 A 1500-3000 A 3000-6000 A 6000-12000 A 12000-24000 A Other value All Current Sensors Voltage Sensors 25-50 V 50-100 V 100-200 V 200-400 V 400-800 V 800-1600 V 1600-3200 V 3200-6400 V All Voltage Sensors Integrated Current Sensors GO Series HMSR Series GXS Series GXN Series GXM Series All Integrated Current Sensors Rogowski Coil ART Series ARU Series ARH Series INTEGRATORS FOR ROGOWSKI COILS Energy Meters DCES DCBM 400 & 600 DCBM 100 TEMA4G EM4T II All Energy Meters Automotive Battery Management EV Chargers Automotive Motor Control Smart Grid Welding Automation Drives High Precision Power Supplies Renewable Energies Trackside Traction After Sales & RMA Merchandize authorization RMA Categories All after sales and RMA Downloads Application Notes Brochures Certificates All Downloads Technical FAQs General All Technical FAQs Company Information History Board of Directors & Committees Organization Values Compliance Sustainability Our locations All Company Information Quality & Environment Quality Environment All Quality & Environment Our partners Become a LEM Supplier Our general terms & conditions Our distributors News & Events All News & Events What do you need ? Product information Check Stock Global information GO EN JP CN EN JP CN Products Current Sensors Voltage Sensors Integrated Current Sensors Rogowski Coil Energy Meters Applications Automotive Battery Management EV Chargers Automotive Motor Control Smart Grid Welding Automation Drives High Precision Power Supplies Renewable Energies Trackside Traction Support After sales and RMA Downloads Technical FAQs About Lem Company Information Quality & Environment Suppliers News & Events Check Stock Career Investors Contact What do you need ? Product information Check Stock Global information GO Home lem_current_page : Current Sensors Current Sensors LEM is a leading supplier of current sensors (also called current transducers), offering a wide range of galvanically isolated sensors that have become industry standards. The broad range of sizes, measuring range, from tiny currents to 24kA, and integration options, busbar, PCB mounted, make them ideal solutions for a broad range of applications.

Product List Contact Sales What is a current sensor used for? As its name suggests, a current sensor measures the flow of current in a conductor.

It can be used in a wide variety of applications, to control the electrical parameters of a locomotive engine for example, or the state of charge of an electric car battery.

For more than 50 years, LEM has grown its expertise and current sensor portfolio to answer the growing demand for current measurement solutions. With its broad portfolio of current sensors and voltage sensors, LEM can address many different applications and meet the various electrical measurement specifications of its customers, be it for accuracy, bandwidth, creepage. 

This broad offer in current measurement solutions is the direct results of our many years of experience and expertise.

Current Transducer vs. Current Sensor While the terms current sensor and current transducer are often used interchangeably, they can carry slightly different technical nuances depending on context.

FeatureCurrent SensorCurrent TransducerDefinitionDevice that detects electrical currentDevice that converts current into a measurable signalOutputMay provide raw or processed signalTypically provides standardized output (e.g., voltage or current)Use in IndustryCommon in automotive, industrial, and energy sectorsSame applications, often used in control systemsTechnology ExamplesHall effect, Fluxgate, Rogowski coilHall effect transducer, Rogowski transducerAt LEM, we design both current sensors and transducers to meet the highest standards of precision, reliability, and application-specific performance.

Measuring current using Hall effect, Fluxgate or Air core sensors Current can be measured by a current transducer relying on different technologies.

A Hall Effect current sensor (open loop or closed loop) will provide an extended measuring range, good global accuracy while preventing from insertion losses.

The specificity of an air-core sensor is that it is working without a magnetic circuit. Also known as Rogowski current sensors, this technology is easy to use and allows for non-contact measurement of AC & pulsed signal.

The Fluxgate current sensor technology will bring the highest accuracy and a strong performance of the current measurement.

What Types of Current Sensors Does LEM Offer? LEM’s portfolio of current sensing solutions is designed to meet the diverse needs of industrial, automotive, and energy applications. Our range includes current sensors, split-core sensors, current transformers, Rogowski coils, integrated current sensors, and automotive battery current sensors—each engineered for precision, reliability, and efficiency.

Current Sensor ICsLEM’s integrated current sensors (ICs) combine advanced Hall-effect technology with compact packaging to deliver high accuracy and fast response times. These sensors are ideal for PCB integration in applications such as motor control, power supplies, and renewable energy systems. They offer galvanic isolation and are optimized for low power consumption and high bandwidth.

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Battery Current SensorsDesigned specifically for automotive battery management, LEM’s battery current sensors support both EVs and ICE vehicles, enabling accurate monitoring of battery charge, health, and energy flow. Available for both high-voltage and low-voltage measurements, they are trusted by leading OEMs for safety, efficiency, and performance.

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Featured LEM current sensors families HLSR SeriesHLSR is our best seller in the solar industry. It brings a lot of benefits along with a small footprint.

DC&AC isolated current measurement with 5 ranges: 10 ARMS, 20 ARMS, 32 ARMS, 40 ARMS, 50 ARMSAccess to voltage referenceLow offset & gain driftMAIN FEATURESSingle supply +5 V or +3.3 V (2 different models)Isolation test voltage: 4.3 KVRMS / 50Hz / 1minThrough hole (-P) or surface (-SM) PCB mounting modelsView more

HAH3 SeriesHAH3 is our 3 phase current sensor for automotive motor control

Excellent accuracyVery good linearityVery low thermal offset driftMAIN FEATURESOpen Loop transducer using the Hall effect sensorLow voltage applicationUnipolar +5 V DC power supply
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CAB SeriesCAB is the best in class current transducer family for state of charge estimation in EV battery management systems

High global accuracy (Measurement of bi-directional current up to 1500AOver Current DetectionMAIN FEATURESFluxgate based measurementAutomotive quality standards compliantUnipolar +12V battery power supplyView more

LAH SeriesLAH family are closed loop current sensors dedicated to industrial applications

PCB mounting design for isolated AC&DC current measurement of 8 to 125 ARMS nominal2 different compact designsMAIN FEATURESDual supply +/- 12 to +/- 15 VIsolation test voltage: 5 kVRMS / 50 Hz / 1minCurrent outputView more

CTSR SeriesCTSR is a closed loop current sensor with high accuracy and very low offset drift over temperature to ensure electrical safety in industrial applications

2 standard modelsPCB mountingSmall currents' measurement from 0.3 to 0.6 ARMS nominalMAIN FEATURESDC, AC, pulse, small currents' measurements with galvanic isolationSingle supply: 0,+5VNon-contact measurement with high aperture (Ø 20.1 mm)View more

Which parameters need to be considered to select the right current sensor? The selection of a current sensor is the result of a technical and economic trade-off, considering the sensor as well as the whole associated system.

Prior to selecting a current transducer, it is mandatory to consider all aspects of the intended application first. 

The following parameters will need specific attention:

Electrical requirements: power supply, peak measurement, response time… Mechanical requirements: aperture size, overall dimensions, mounting, materials… Thermal conditions: current profile versus time, maximum RMS measurement, cooling… Environmental conditions: vibrations, temperature, proximity of magnetic fields… Performing tests in the specific application environment is also strongly recommended to make sure that the current sensor is the right fit for it.

Where do we find current sensors? Current sensors are used in every area where electricity is used. And there are lots of domains complying to this:

Battery Management SystemElectric Vehicle Supply EquipmentPower suppliesAutomotive Moto ControlSmart GridIndustrial applications: welding, automation, drivesHigh precisionRenewable energiesTracksideTraction Why Choose LEM Current transducers LEM’s current transducers are engineered for high accuracy, fast response times, and robust performance across demanding environments.

Our AdvantagesWide Product Range: From compact PCB-mounted transducers to high-power industrial models.Advanced Technologies: Hall effect, Fluxgate, and Rogowski coil options tailored to your needs.High Accuracy: Precise measurement for AC, DC, and complex waveforms.Global Standards Compliance: Designed to meet IEC, UL, and automotive-grade certifications. Where to buy Current Transducers? Looking to purchase LEM current transducers? Use our Check Stock Tool to view real-time availability from our trusted distributor partners.

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This tool helps you find the right product quickly and ensures fast delivery through our global distribution network.

Want to know more about our current sensing offer? Feel free to check our innovation page to know more about the technologies used in our current transducers offer.

You can also user our product list and its intuitive filters to select the right part for your application.

Our team remains available for any inquiry you might still have.

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FAQ - Current Sensor, Current Transducer Are current transducers the same as sensors?Not exactly. While both measure electrical current, a transducer typically refers to a device that converts current into a standardized output signal (like voltage or current), whereas a sensor may simply detect or monitor current. In many applications, the terms are used interchangeably, especially when the device includes signal conditioning.What’s the difference between open-loop and closed-loop transducers?Open-loop transducers use magnetic field sensing (e.g., Hall effect) and are ideal for cost-sensitive applications with moderate accuracy needs.Closed-loop transducers use feedback mechanisms to maintain high accuracy and fast response, making them suitable for precision industrial and power electronics applications.LEM offers both open-loop and closed-loop solutions to match your performance and budget requirements.

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