HO 100-S-0100 , HO100-S-0100

LEM HO 100-S-0100 HO-S Series Open Loop Hall Effect Current Transducer

LEM HO 100-S-0100 Product Overview

The HO 100-S-0100 is an open-loop Hall effect current transducer from LEM's HO-S Series, designed for the electronic measurement of DC, AC, and pulsed currents with galvanic isolation between the primary and secondary circuits . This panel-mount transducer features a 15 x 8 mm aperture for primary conductor installation and is optimized for unipolar +5 V supply operation . The compact design measures 22 x 45 x 33 mm and includes a repositionable mounting foot for flexible installation .

Rated for 100 A nominal with a measuring range of ±250 A (2.5 × IPN), it outputs a ratiometric analog voltage of 2.5 ± 0.8 V at nominal current . Accuracy is ±1% at 25°C and ±4.55% at 105°C, with ±0.5% linearity . Response time is 3.5 µs and frequency bandwidth is DC to 100 kHz . Supply voltage range is 4.5 V to 5.5 V with a typical current consumption of 19 mA (max 25 mA) . Operating temperature ranges from -40°C to +105°C . Insulation features 8 mm creepage and clearance distances with CTI 600 and insulation test voltage of 4.3 kV RMS . The device is bidirectional, factory calibrated, and carries a 5-year LEM warranty .

LEM HO 100-S-0100 Key Specifications

LEM HO 100-S-0100 Key Advantages

The HO 100-S-0100 employs open-loop Hall effect technology, delivering ±1% accuracy and ±0.5% linearity while providing galvanic isolation between primary and secondary circuits . The ±250 A measuring range provides significant headroom for overload conditions (2.5 × IPN). The 100 kHz bandwidth and 3.5 µs response time capture dynamic current signals in drive and power conversion applications .

A key feature is the dedicated overcurrent detection output set at 2.93 × IPN on a separate open-drain pin, enabling fast system-level protection without additional circuitry . The VREF IN/OUT access provides system-level flexibility for reference voltage synchronization (external reference overdrive from 0.5 V to 2.65 V) . The single +5 V supply simplifies integration into low-voltage digital systems . The panel-mount design with 15 x 8 mm aperture offers low power consumption (19 mA typical), high immunity to external interference, and no insertion losses. The device is factory calibrated with low offset and gain drift .

LEM HO 100-S-0100 Typical Applications

AC variable speed drives 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 and MPPT systems
Solar inverter DC side current measurement

Why Choose the LEM HO 100-S-0100?

The HO 100-S-0100 combines a 100 A rated current and ±250 A measuring range with ratiometric voltage output in a compact panel-mount package with a single +5 V supply and overcurrent detection. Manufactured by LEM, it delivers stable, accurate, and safe current measurement for industrial applications requiring high-speed current sensing. The open-loop Hall effect design offers a cost-effective solution with excellent interference immunity and panel mounting flexibility . The wide -40°C to +105°C operating temperature range and 8 mm creepage/clearance with reinforced insulation ensure reliable performance in demanding environments . The product is Active with a 5-year LEM warranty .