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

Fluxgate Technology reinvented

IN series, for all High-precision applications

The IN family is LEM’s most advanced high precision group of current sensors. They can be used for the electronic measurement of current: DC, AC, pulsed..., with galvanic separation between the primary and the secondary circuit.

With its patented and ground-breaking digital integration technology, the IN electronic parts represents a significant evolution to LEM’s older High Precision sensors. The IN transducers offer best-in-class performance, with the highest accuracy in the market, and low noise over wide operating temperature range. The IN sensors can be mounted on panels either flat or vertically.

The IN current sensors are relying on a reinvented closed loop Fluxgate technology (LEM patent), enabling their high precision, among other benefits. They find applications not only in the industry but also in settings such as laboratories and medical environments.

IN – Features and benefits

IN 1000-S


  • Closed loop (compensated) current sensors using an extremely accurate zero flux detector
  • 9-pin D-Sub male secondary connector
  • Status signal to indicate the transducer state
  • LED indicator confirms normal operation
  • Metal housing to improve immunity to EMC & power dissipation
  • Transducer identification
  • Large apertures for cables and busbars

Main characteristics

  • Best-in-class accuracy: excellent linearity and minimum electrical offset
  • Broad frequency bandwidth (up to 1.1 MHz @±3 dB)
  • Compact design with largest aperture for cables and busbars
  • Really good immunity from external fields
  • Overcurrent and protection embedded by design
  • Extended operating temperature range: -40..+85 °C
  • Extremely high stability (0.15 ppm/month)

Typical applications

IN sensors are commonly utilized in industrial, laboratory, and medical applications. It is typical to find IN high precision sensors in the following applications:

  • Feedback element in high performance gradient amplifiers for MRI
  • Feedback element in high-precision, high-stability power supplies
  • Calibration unit
  • Energy measurement
  • Feedback element for Power Meter (e.g. EV Test Benches)
  • Medical equipment

LEM IN – Download & Technical Characteristic

Product Document Primary nominal RMS voltage Secondary Nominal Signal Supply Voltage range Op. Temperature
IN 100-S


100 A Current 15 to 15 -40 to 85 °C
IN 200-S


200 A Current 15 to 15 -40 to 85 °C
IN 400-S Datasheet 400 A Current 15 to 15 -40 to 85 °C
IN 500-S Datasheet 500 A Current 15 to 15 -40 to 85 °C
IN 1000-S Datasheet
1000 A Current 15 to 15 -40 to 85 °C
IN 1200-S Datasheet 1200 A Current 15 to 15 -40 to 85 °C
IN 2000-S Datasheet
2000 A Current 15 to 15 -40 to 85 °C
IN 2000-SB Datasheet 2000 A Voltage 15 to 15 -10 to 70 °C
IN 2000-SB/SP1 Datasheet 2000 A Voltage 15 to 15 -40 to 85 °C


The use of fluxgate technology in transducers for precise current measurement is well-known. However, it has some limitations linked to the ripple derived from the excitation voltage. LEM’s innovation takes fluxgate current transducers to previously unachieved performance levels through digital technology.

fluxate schema

This digital technology brings a number of benefits.

  • Immunity to temperature effects, interference and supply voltage variation
  • A major reduction of the ripple from the fluxgate driving signal


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