LA 55, LA 100

For the electronic measurement of currents: DC, AC, pulsed..., with galvanic separation between the primary circuit and the secondary circuit.

LA 55, LA 100 - Current sensors

The LA 55 and LA 100 product families consist of closed-loop Hall effect current sensors, purpose-built for measuring direct current (DC), alternating current (AC), and pulse current. They can respectively measure 25-50 and 100 Arms and incorporate galvanic isolation for enhanced safety.

LA 55 and LA 100 current sensors are intended for installation onto printed circuit boards (PCB). 

Their design features a 12.7 x 7 mm aperture for accommodating plug-type connections through the primary conductor. These parts deliver outstanding precision and swift response times, making them well-suited for industrial applications.

LA 55, LA 100 – Features and benefits

LA 55, LA 100 current sensors

Main characteristics

  • Closed loop (compensated) current transducer using the Hall effect
  • Insulating plastic case recognized according to UL 94-V0


  • Excellent accuracy
  • Very good linearity
  • Low temperature drift
  • Optimized response time
  • Wide frequency bandwidth
  • No insertion losses
  • High immunity to external interference
  • Current overload capability

Typical applications

LA 55 and LA 100 current sensors are designed for industrial applications:

LEM LA 55, LA 100 – Download & Technical Characteristic

ProductDocumentPrimary nominal RMS voltageSupply Voltage rangeOp. Temperature
LA 25-PDatasheet
12,5 A12 to 15-25 to 85°C
LA 55-PDatasheet
50 A12 to 15-40 to 85°C
LA 55-P/SP1Datasheet
50 A12 to 15-40 to 85 °C
LA 55-P/SP23Datasheet50 A12 to 15-40 to 85 °C
LA 55-TPDatasheet
50 A12 to 15-40 to 85 °C
LA 55-TP/SP1Datasheet50 A12 to 15-40 to 85°C
LA 55-TP/SP27Datasheet50 A12 to 15-40 to 85°C
LA 100-PDatasheet100 A12 to 15-40 to 85 °C
LA 100-P/SP13Datasheet100 A12 to 15-25 to 70 °C
LA 100-TPDatasheet100 A12 to 15-40 to 85 °C


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