Hall Effect HO-S Series by LEM

100 – 240A DC or AC Hall effect sensor

Product Description

The HO-S by LEM is an open loop Hall effect device designed for the electronic measurement of DC, AC and pulsed currents with galvanic separation between the primary and secondary circuits.

The HO-S has primary ratings of 50 – 250A and can measure up to 600A DC or AC.  A single +5Vdc power supply is required to provide power.  The HO-S Hall effect current transducer is 1% accurate* (o.5% linearity).  It outputs 2.5V at 0A, 3.3V at the rated current (positive) and 1.7V at the rated current (negative).

The HO-S can measure DC current and pulsed currents, as well AC frequencies up to 100 kHz (-3 dB).  It has a fast response (2.5 to 3.5 µS) and low offset drift.  These devices have been evaluated for over voltage category III and pollution degree 2 environments.

Note that the HO-S series (when ordered from Aim Dynamics) ships with the mating connector!  There is no need to try and specially order the connector, only to get the wrong one, delay your project, etc.

*The 50A version is 1.25% accurate. See spec sheet for details.


  • Open loop multi-range current transducer
  • ±1% Accuracy
  • ±0.5% Linearity
  • Frequency: DC ~ 100kHz (-3 dB)
  • Voltage output
  • Single power supply +5 V
  • Overcurrent detect 2.93 × IPN (peak value)
  • Galvanic separation between primary and secondary circuit
  • Low power consumption
  • Compact design for panel mounting
  • Aperture: 15 × 8 mm
  • Factory calibrated
  • Connection mating with JST:
    • housing PHR-5
    • contact SPH-00xT
  • Repositionable mounting foot
  • Low offset drift
  • Over-drivable Vref
  • 8 mm creepage /clearance
  • Fast response
  • Low profile 2 mm pitch connector for 24 to 32 AWG wire
  • UL Recognized

Technical Specs

HO-S Series Spec Sheet


  • IEC 61800-1: 1997
  • IEC 61800-2: 2015
  • IEC 61800-3: 2004
  • IEC 61800-5-1: 2007
  • IEC 62109-1: 2010
  • UL 508: 2013


  • AC variable speed and servo motor drives
  • Static converters for DC motor drives
  • Battery supplied applications
  • Uninterruptible Power Supplies (UPS)
  • Switched Mode Power Supplies (SMPS)
  • Power supplies for welding applications
  • Combiner box
  • MPPT

Additional information

Weight.1 lbs
Dimensions2 x 2 x 1 in
Amp Rating

240, 100, 200