LEM

What LEM does

LEM, founded in 1972 and listed on the SIX Swiss Exchange under ticker LEHN, is a Swiss-headquartered manufacturer of electrical measurement components — current sensors, voltage sensors, integrated current sensor ICs, Rogowski coils, and DC energy meters — used by automotive OEMs and Tier-1 suppliers, industrial drives and automation builders, railway operators, and renewable-energy and smart-grid customers. Its technology stack spans five sensing modalities — Hall Effect (open-loop, closed-loop, Eta), Fluxgate (IT, C, Low-Frequency, CTSR/CAS/CKSR variants), Tunnel Magneto-Resistance (TMR), Rogowski air-core, and its proprietary PRiME PCB-based air-core architecture — covering current measurement from roughly 10 A to 42 kA and voltage measurement from 25 V to 6,400 V, with galvanic isolation and Sigma-Delta digital transmission as differentiating features. The product portfolio includes named series such as IN (precision, up to 2,000 A), SMU (State-of-Charge monitoring for EVs), HSU (hybrid Shunt-Hall battery sensor), DCES (DC energy meter), GO/HMSR/GXS/GXN/GXM (integrated sensor ICs), ART/ARU/ARH (Rogowski coils), and the newly launched FL/FRS OLCI sensors for high-current traction and industrial applications.

LEM operates a fab-light hybrid model: ASIC and sensor design is performed in-house at its headquarters in Meyrin (Switzerland) and R&D centers in Munich (Germany, focused on ASICs/semiconductors) and Shanghai (China, 1,400 square meters of lab space), while volume production runs from a manufacturing facility in Penang (Malaysia). The company has roughly 1,600 employees across 16+ countries and reaches customers through a direct enterprise sales motion to major automotive OEMs and Tier-1 suppliers, an authorized distributor network spanning 40+ countries, and major online electronics distributors (Digi-Key, Mouser, Farnell, RS Group). Recent strategic activity — including the 2024 expansion of R&D and manufacturing capacity, an active 2024-2026 product launch cadence across battery monitoring and high-current OLCI sensors, and explicit exposure to Chinese low-cost competition — frames LEM as a mid-cap industrial sensor incumbent defending share with new platforms while extending into sub-system offerings (such as SMU) and high-power industrial/renewable markets.

Name

LEM

Legal name

LEM International SA

Website

https://lem.com

Company type

Public

Founded year

1972

Operating status

Operating

Headcount range

1,001–5,000 employees

Short description

LEM is a Swiss-listed (SIX: LEHN) manufacturer of current and voltage sensors, integrated sensor ICs, Rogowski coils, and DC energy meters serving automotive OEMs and Tier-1s, industrial drives and automation, railway, and renewable-energy and smart-grid customers across 40+ countries.

Ownership category

akta.pro rank

Product category

Electrical Measurement Sensors

NAICS

Instruments and Related Products Manufacturing for Measuring, Displaying, and Controlling Industrial Process Variables (334513), Instrument Manufacturing for Measuring and Testing Electricity and Electrical Signals (334515)

SIC

Industrial Instruments For Measurement, Display, And Control (3823), Instruments For Meas & Testing Of Electricity & Elec Signals (3825)

akta.pro primary industry

Power Quality, Metering & Monitoring (HDACAJAG)

akta.pro secondary industries

EV/Industrial Charging Power Electronics (Chargers, rectifiers, power stages) (IMAGADAF), Automotive ECUs/Control Modules & Embedded Electronics Manufacturing (IMACAJAC), Meter-to-Cash / Billing & CIS Integration for AMI (EUADAFAM)

Keywords

• Current measurement sensors
• Voltage measurement sensors
• Hall effect transducers
• Electrical energy meters
• Galvanic isolation sensors

Headquarters

HQ city

Fribourg

HQ country

Switzerland

HQ region

Europe

Offices4 records

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

Supply Chain, Operations, Technology or R&D, Personnel, Marketing or Sales, Infrastructure

Revenue model

1. Current and Voltage Sensors: LEM designs, develops, and manufactures a comprehensive portfolio of current and voltage sensors. These include open-loop and closed-loop Hall effect sensors, Fluxgate sensors, TMR sensors, and Rogowski coils for measuring electrical parameters in industrial, automotive, and railway applications. Revenue is generated through hardware product sales to OEMs, Tier-1 suppliers, and industrial customers.
2. Energy Meters: LEM produces energy metering solutions including DC energy meters (DCES series), DCBM series for battery energy measurement, and EM4T II meters. These products enable energy monitoring and billing in renewable energy, EV charging, and industrial applications.
3. Integrated Current Sensors (ICs): LEM manufactures integrated current sensor ICs including GO, HMSR, GXS, GXN, and GXM series. These compact solutions integrate sensing elements with signal conditioning for easier integration into customer applications.

Go-to-market motion3 records

Distribution channels3 records

Marketing channels4 records

Core offering

LEM designs, develops, and manufactures electrical parameter measurement sensors and meters — primarily current and voltage transducers, integrated current sensor ICs, Rogowski coils, and DC energy meters — built on proprietary Hall Effect, Fluxgate, TMR, and air-core technologies. Products provide galvanically-isolated measurement from 10A to 24,000A and 10V to 4,200V for automotive battery management, motor control, EV charging, industrial drives, railway traction, renewable energy, and smart-grid applications. Revenue is generated almost entirely through hardware product sales to OEMs, Tier-1 suppliers, and industrial customers via direct sales and a global distributor network.

Product overview

LEM offers a comprehensive portfolio of electrical measurement solutions organized into five main product categories: current sensors (including IN, FL, FRS series for precision measurement from 0-24,000A), voltage sensors (LV series for 100-2,500V measurement), integrated current sensors (GO, HMSR, GXS, GXN, GXM series for embedded applications), Rogowski coil solutions (ART, ARU, ARH series for AC/pulsed currents), and energy meters (DCES, DCBM, TEMA4G, EM4T II for energy monitoring and billing). The company leverages seven key technologies including Hall effect (open and closed loop), Fluxgate, TMR (Tunnel Magneto-Resistance), and air-core/Rogowski technologies to deliver galvanically isolated sensors for applications in automotive battery management, EV charging, motor control, smart grid, industrial automation, drives, power supplies, renewable energy, trackside, and traction systems.

Differentiator

Problem solved

Functional benefit

Brands

• PRiME: Air-core technology brand for current measurement
• ULTRASTAB
• EM4T

Products and services

• FL Series (OLCI current sensors) Open Loop Coreless Integral (OLCI) current sensors for electronic measurement of DC, AC, and pulsed currents up to 42 kA with reinforced galvanic isolation, available in 200 mm or 300 mm apertures with 4-20 mA or 0-5 V output; intended for industrial, traction, and trackside high-power applications such as wind turbine power converters, electrolysers, and high-power drives.
• FRS Series (OLCI current sensors) Open Loop Coreless Integral (OLCI) current sensors for precise electronic measurement of DC, AC, and pulsed currents up to 9 kA with full electrical isolation; 104 mm aperture with 4-20 mA current or 0-5 V instantaneous voltage output, suited for industrial, traction, and trackside high-power uses.
• IN Series current sensors Ultra-accurate and low-noise current sensors covering 200 to 2,000 A for high-precision measurement applications, with accuracy as low as 0.0018%.
• SMU Series (Single Monitoring Unit) Single Monitoring Unit (SMU) for accurate State of Charge (SOC) estimation across all EV technologies, addressing the battery management needs of electric vehicle OEMs and Tier-1 suppliers.
• HSU Series (Hybrid battery current sensor) Hybrid battery current sensor combining Shunt and Hall technologies, designed for high-performance battery current measurement in electric and hybrid vehicles.
• DCES Series (DC energy meter) Direct Current Energy Sensor (DCES) — LEM's new-generation DC metering solution for energy measurement in DC applications including EV charging and renewable energy systems.
• LF Series current sensors Current sensors covering nominal values from 100 to 2300 ARMS for DC, AC, and pulsed current measurement with electrical isolation.
• LAC Series current sensors Current sensors with ratings from 200 ARMS to 400 ARMS for DC, AC, and pulsed current measurement with electrical isolation.
• Current Sensors portfolio Comprehensive portfolio of LEM current sensors covering 0-1 A to 12000-24000 A, including open-loop, closed-loop, and fluxgate technologies for automotive, industrial, traction, and renewable applications.
• Voltage Sensors portfolio LEM voltage sensors covering 25-50 V to 3200-6400 V ranges for measuring nominal voltages from 100 V to 2,500 V across industrial, energy, and railway applications.
• Integrated Current Sensors (GO / HMSR / GXS / GXN / GXM series) Integrated current sensor ICs (GO, HMSR, GXS, GXN, and GXM series) combining a sensing element with signal conditioning for embedded measurement in automotive and industrial applications.
• Rogowski Coil portfolio (ART / ARU / ARH) Air-core current sensors using Rogowski technology, including the ART (flexible AC/pulsed), ARU (industrial AC), and ARH (high-current AC) series, plus integrators for AC and pulsed current measurement.
• Energy Meters portfolio (DCBM 100, DCBM 400 & 600, TEMA4G, EM4T II) LEM energy metering solutions including the DCBM 100 compact DC energy meter, DCBM 400 & 600 bidirectional DC energy meter, TEMA4G on-board railway energy meter, and EM4T II precise energy meter for monitoring and billing.
• DCBM 400 & 600 (bidirectional DC energy meter) Bidirectional DC energy meter for battery monitoring and energy measurement in DC applications such as battery energy storage and EV charging.
• DCBM 100 (compact DC energy meter) Compact DC energy meter for battery monitoring and energy measurement in space-constrained applications.
• LV 100 voltage sensor Closed-loop Hall effect voltage sensor for measuring nominal voltages from 100 V to 2,500 V, panel-mounted design.
• TEMA4G energy meter Energy meter designed for railway on-board energy measurement applications.
• EM4T II energy meter Energy meter for precise energy measurement and billing applications.

Quantifiable outcome

• Measurement range from 10 to 2,000 A (current) and 10 to 4,200 V (voltage)
• +3 more outcomes

Named customers1 record

Segments5 records

Ideal customer profiles5 records

Technology focussed Yes

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature7 records

Partnerships

Three partnerships are on record, tiered core.

• Global Distributor NetworkcoreChannel Partner/ Reseller/ DistributorLEM maintains relationships with authorized distributors across 40+ countries enabling local sales, technical support, and product availability. Regional distributors include SEMAK (Argentina), FASTRON (Australia), SOLICOMP (Austria), AMDS4 (Brazil), DACPOL (Bulgaria/Poland/Ukraine), SAGER ELECTRONICS (Canada/USA), SHANGHAI JIDIAN (China), HAUBER & GRAF (Germany), ASAHI TECH/NEXTY (Japan), and many others providing comprehensive global coverage.
• Online Distributors (Digi-Key, Mouser, Farnell, RS Group)coreChannel Partner/ Reseller/ DistributorMajor online electronics distributors enabling self-service purchasing for smaller customers and prototype quantities. Digi-Key, Distrelec-Schuricht, Farnell/Newark/Element 14, Mouser, and RS Group provide global e-commerce access to LEM products.
• Automotive OEMs and Tier-1 SupplierscoreChannel Partner/ Reseller/ DistributorLEM works with all major car manufacturers and Tier-1 suppliers worldwide, supplying galvanically-isolated sensors for battery management, motor control, and other automotive applications.

Scale indicators6 records

Recent moves7 records

Expansion highlights5 records

Direct peers

• Carlo Gavazzi: Carlo Gavazzi offers current transformers, energy meters, and monitoring relays that directly overlap with LEM's industrial and energy meter portfolio.
• Allegro MicroSystems: Allegro is a direct competitor in magnetic current sensor ICs and Hall-effect sensors for automotive and industrial applications, overlapping directly with LEM's GO/HMSR/GXS integrated sensor lines.
• Melexis: Belgian automotive sensor specialist competing with LEM in current sensors, motor control ICs, and battery management sensors for global OEMs.
• TDK (InvenSense & TMR Sensors): TDK's TMR sensor portfolio directly competes with LEM's TMR technology, and TDK's broader automotive/industrial sensor footprint creates overlapping customer relationships.

Emerging players

• VACUUMSCHMELZE (VAC): VAC specializes in precision current transformers and magnetic materials, overlapping with LEM's Fluxgate and high-precision current measurement solutions.

Broad incumbents

• STMicroelectronics: STMicroelectronics offers automotive-grade current sensors and integrated power solutions, competing with LEM across EV powertrain, BMS, and industrial drive applications.
• Texas Instruments: TI's broad portfolio of current shunt monitors, Hall-effect sensors, and isolation amplifiers competes with LEM's lower-current integrated sensor ICs in industrial and automotive designs.
• Infineon Technologies: Infineon's XENSIV current sensor family and automotive power portfolio competes with LEM's integrated sensor ICs and battery management sensors across automotive and industrial markets.
• Honeywell Sensing: Honeywell's industrial current sensors and switches overlap with LEM's industrial segment offerings, though Honeywell serves a broader instrumentation portfolio.

Regional players

• Yokogawa Electric: Yokogawa competes with LEM in precision power measurement and energy metering, particularly in industrial and energy markets across Asia and Japan.

Market position

Strengths4 records

Weaknesses4 records

Competitive moat5 records

Key risks5 records

Key highlights6 records

Customer concentration

• Xx.com/lem_inc

Compliance8 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles2 records

Subsidiaries3 records

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A1 record

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about LEM