LEM Current Sensors & Transducers

LEM Current Sensors: Precision instruments from LEM that accurately measure electric current flow, ensuring optimal energy management and system safety in power-intensive industries. LEM, a leading supplier of current sensors (also known as current transducers), offers a wide range of galvanically isolated sensors that have become industry benchmarks. With various sizes and measuring ranges-from tiny currents to 24kA-and integration options including busbar and PCB mounted designs, these sensors are ideal for diverse applications.

Through its innovative electrical measurement solutions, LEM is aiding customers and society in accelerating the transition to a sustainable future. Employing 1,500 people across more than 15 countries, LEM transforms technological potential into powerful solutions, spearheading mega trends such as renewable energy, mobility, automation, and digitization.

LEM Open Loop Hall Effect Current Transducers are designed for precise electronic measurement of DC, AC, and pulsed currents, offering galvanic separation between primary and secondary circuits. LEM, a leader in electrical measurement, primarily serves the automotive and industrial markets. Headquartered in Switzerland, LEM is a leading current sensing expert, incorporating TMR dies into their integrated current sensors (ICS), essential components for rapidly expanding electrification applications like onboard chargers (OBCs) in electric vehicles (EVs).

Leading the world in electrical measurement, LEM provides optimal, reliable, and safe solutions for energy and mobility. With 1,700 employees in 17 countries, LEM transforms technological potential into powerful solutions, addressing megatrends such as renewable energy, mobility, automation, and digitization. Through innovative electrical sensors and solutions, LEM is helping customers and society accelerate the transition to a sustainable future.

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. 

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.

Selecting a Current Sensor

Choosing a current sensor involves balancing technical and economic factors, considering both the sensor and the entire associated system.

Before selecting a current transducer, it is essential to evaluate all aspects of the intended application:

• Electrical Requirements

  Consider power supply, peak measurement, response time, etc.

• Mechanical Requirements

  Take into account aperture size, overall dimensions, mounting options, materials, etc.

• Thermal Conditions

  Assess the current profile versus time, maximum RMS measurement, and cooling needs.

• Environmental Conditions

  Factor in vibrations, temperature, and the proximity of magnetic fields.

Performing tests in the specific application environment is strongly recommended to ensure the current sensor is the right fit.

Current sensors are used wherever electricity is utilized, across various domains including:

• Battery Management Systems
• Electric Vehicle Supply Equipment
• Power Supplies
• Automotive Motor Control
• Smart Grids
• Industrial Applications

  welding, automation, drives

• High Precision Applications
• Renewable Energies
• Trackside Monitoring
• Traction Systems

Featured Items

FRS, FL SERIES

LEM's new Open Loop Coreless Integral sensors (OLCI) for the electronic measurement of current up to 42kA; The LEM FRS and FL series are current transducers designed for high-precision measurement of AC, DC, and complex waveform currents. These transducers utilize closed-loop Hall effect technology, ensuring exceptional accuracy and stability. They are particularly ideal for applications in industrial automation, renewable energy systems, and power conversion where precise current monitoring is critical. The FRS series offers features like high linearity and low offset drift, while the FL series provides high-frequency operation and wide dynamic range. Both series are known for their robust design, reliability, and ability to maintain accuracy across a wide range of operating conditions.

CDT SERIES : AUTOMOTIVE RESIDUAL CURRENT MONITORING TYPE B SENSORS

CDT is an automotive grade leakage current sensor family also called Residual Current Monitoring (RCM) or Residual Current Detection (RCD) class B

HSTDR - AUTOMOTIVE CURRENT SENSOR

Best-in-class flexible design to measure current in automotive traction inverters, the LEM HSTDR series features high-performance current transducers designed for precise measurement of DC, AC, and pulsed currents in a wide range of applications. Utilizing open-loop Hall effect technology, these transducers provide excellent accuracy, low power consumption, and wide frequency bandwidth. They are particularly suited for use in renewable energy systems, industrial automation, and electric vehicle applications, where reliable and accurate current sensing is essential. The HSTDR series offers robust performance with high immunity to external magnetic fields, ensuring consistent and reliable operation in various environmental conditions.

CAB SERIES – HIGHLY PRECISE

Essential for the best State-Of-Charge (SOC) estimation in the safer manner.

HBCT SERIES

Automotive current sensor for battery management systems, the LEM HBCT series comprises high-bandwidth, closed-loop current transducers designed for accurate measurement of AC, DC, and complex waveform currents. These transducers employ a fluxgate sensor technology, providing high precision and stability over a broad temperature range. They are particularly well-suited for power electronics applications, such as inverter control, power supplies, and motor drives, where high accuracy and fast response times are critical. The HBCT series ensures minimal phase shift and low noise, making them ideal for dynamic current measurement in demanding industrial environments.

HC16F SERIES

A highly flexible design to measure DC link current as well as phase current in motor control applications

HOB SERIES

A unique combination of short response time and high bandwidth for current sensing in harsh environments

IN SERIES

Ultra-accurate and low noise level current sensors ranging from 100 to 2,000 A.

HTRS SERIES

A current sensor with a split core structure, allows to install the measurement system on an existing power cable, and this without disco

HAH3DR SERIES

The LEM HAH3DR series is a range of high-accuracy current transducers designed for precise and reliable measurement of direct, alternating, and pulsed currents. These transducers feature an open-loop Hall effect technology, offering exceptional performance in a compact form factor. They are particularly suitable for industrial applications, including renewable energy systems, battery management, and electric vehicle charging stations, due to their high bandwidth, low power consumption, and wide operating temperature range. The HAH3DR series ensures excellent linearity and low offset drift, making them ideal for both dynamic and static current measurements. The HAH3DR is a three-phase current sensor for automotive high voltage traction inverters in xEVs.

CDSR SERIES

CDSR is a leakage current sensor developed to meet market demand for a residential and commercial charging station, offering a version for single-phase architecture and another for three-phase topo

LF 205, 305, 505, 1005, 2005 SERIES

For DC, AC, pulse currents' measurements of 100 to 2000 ARMS nominal with galvanic isolation, LEM products fall broadly into multiple areas of application and are used within general industry, automotive industry, for railway and trackside applications, energy measurement relating to railway on-board applications, energy & automation, battery monitoring, and in Wi-LEM - wireless sub-metering networks that measure energy consumption.