LEM LH25NP HighPrecision Multi-Range Current Sensor – Closed-Loop Hall Effect for Accurate Monitoring Every Moment

LH25-NP Product Overview

The LEM LH25-NP is a closed-loop Hall-effect current sensor from LEM (Switzerland), built with advanced ASIC technology. Designed for PCB mounting, it is ideal for precise measurement of DC, AC, and pulse currents. With its flexible multi-range selection, high accuracy, fast response, and wide operating temperature range, the LH25-NP is the perfect choice for home appliances, variable speed drives, UPS, switch-mode power supplies, air conditioners, and many other industrial applications.

LH25-NP Key Advantages

Flexible Multi-Range – One Sensor Covers Multiple Needs

The LH25-NP supports three nominal current ranges: 8A, 12A, and 25A, all within a single model. You can adapt to different operating conditions without changing sensors – greatly simplifying selection and reducing inventory costs.

High Accuracy ±0.5% with Extremely Low Temperature Drift

Overall accuracy: Total error of only 0.5% at rated current across the entire temperature range

Zero drift: Offset drift as low as 0.1% of Ipn, maintaining ultra-low zero-output fluctuation from -40°C to +85°C

Technology: Closed-loop ASIC Hall-effect technology, combined with LEM’s patented digital signal processing, effectively eliminates flux-gate drive ripple, minimising high-order harmonics and thermal drift

Ultra-Fast Response – Capture Transient Currents Instantly

Response time < 0.5 µs allows you to quickly respond to current changes, making it ideal for variable frequency drives, inverters, and switchmode power supplies that demand real-time performance.

Safe & Reliable – 5kV Electrical Isolation

Isolation test voltage: 5 kVRMS / 50 Hz / 1 min, ensuring safe separation between power and control circuits

Dual power supply: Compatible with ±12 V to ±15 V, matching common industrial control power sources

5-year warranty: Original LEM quality assurance, stable and reliable for long-term operation

LH25-NP Technical Specifications

LH25-NP Typical Applications

The LH25-NP delivers outstanding performance in a wide range of industrial and consumer electronics applications:

Variable speed drives – real-time motor current monitoring for precise speed control and overcurrent protection

Switch-mode power supplies (SMPS) – primary side current detection to improve efficiency and stability

UPS systems – battery charge/discharge current monitoring for critical power protection

Inverter air conditioners – precise compressor current control to improve energy efficiency

Home appliances – current monitoring and protection in smart appliances

Why Choose the LH25-NP?

Trusted brand, proven reliability
LEM is the world leader in electrical measurement transducers with over 40 years of experience – quality you can rely on.

High accuracy, stable in all conditions
±0.5% accuracy + 0.1% zero drift – stable measurements over the full range and full temperature range, no matter the environment.

Fast response, catch every transient
Submicrosecond response time captures every current fluctuation accurately.

High isolation, worry-free safety
5 kV high isolation voltage guarantees safe separation between power and control circuits.

⑤ One sensor for multiple ranges
A single model covers 8A / 12A / 25A – more flexible selection, more economical stocking.