HTB 50-P Open-Loop Hall Effect Current Sensor

Why do engineers worldwide trust the LEM HTB 50-P?

Is your current measurement accuracy falling short, dragging down system efficiency? Does sensor temperature drift cause unreliable readings in summer and winter alike? Is your system integration space too tight for bulky sensors?

The HTB 50-P solves all these challenges.

Designed by LEM, the Swiss sensing expert, the HTB 50-P is an open-loop Hall effect current sensor built for industrial-grade current monitoring. Using the Hall effect principle, it provides full electrical isolation between the primary (high-power circuit) and secondary (measurement circuit) with an isolation voltage of 2500V. This allows you to safely and accurately measure DC, AC, pulsed, and mixed current waveforms – even in high-voltage systems.

HTB 50-P Key Technical Specifications

HTB 50-P 9 Key Advantages – Delivering Value to You

Accurate Measurement – Know Every Amp

At +25°C, the HTB 50-P achieves better than ±1% accuracy and ±1% linearity error. Whether capturing complex waveforms at a variable frequency drive output or measuring charge/discharge currents in a power management system, the HTB 50-P delivers stable, repeatable results.

2500V Electrical Isolation – Safety First

Full galvanic isolation of 2500V between primary and secondary circuits protects your high-voltage applications. LEM has decades of experience in isolation technology, and every sensor is rigorously tested.

3 µs Response – Faster System Reaction

With a <3 µs response time and DC–50 kHz bandwidth, the HTB 50-P handles everything from transient inrush currents to high-frequency PWM waveforms without missing a beat.

Industrial Wide Temperature Range – Rock-Solid in Extreme Environments

Operating from -40°C to +80°C, with an electrical offset drift of < ±2.0% of Ipn/10K. From freezing northern factories to scorching outdoor EV chargers, the HTB 50-P stays accurate.

Ultra-Compact – Frees Up PCB Space

With a footprint of only 39×34 mm and a height of 34 mm, a single HTB 50-P handles core current monitoring for an entire device. More space for your design.

One Design, Wide Current Coverage

The HTB series includes seven models sharing the same compact package, covering from 50A to 400A rated current. No need to redesign your PCB layout when scaling power levels.

High Immunity – Stable in Harsh EMI

Designed to resist external interference, the HTB 50-P remains stable in noisy environments like VFDs and PWM power supplies.

Low Power – Green Operation

Consumes only 4 mA from a wide ±12V to ±15V supply. Less heat, higher reliability.

Authorized & Certified – Quality Assured

Complies with EN50178, IEC61010-1, bears CE mark, UL 94-V0 flame rating, RoHS compliant, and backed by a 5-year warranty.

HTB 50-P Broad Application Range

Thanks to its excellent performance and reliability, the HTB 50-P is a top choice for engineers in many fields:

Industrial Automation

AC variable frequency drive current monitoring

Servo motor drive current closed-loop control

Switching mode power supply (SMPS) current management

Welding equipment power measurement

Renewable Energy & Power

Photovoltaic inverter real-time output current monitoring

Battery-powered system current detection

Uninterruptible power supply (UPS) current monitoring

Sources: LEM official product page and application case documents.