LEM HAH1DR 700-S Open-Loop Hall Effect Current Sensor

LEM HAH1DR 700-S Product Overview

The HAH1DR 700-S is a high-precision current sensor from LEM's HAH1DR series, based on open-loop Hall effect technology. It is designed for electronic measurement of DC, AC, and pulsed currents, with galvanic isolation between the primary and secondary circuits.

The sensor utilizes open-loop Hall effect technology, with a rated current of 700A and a measuring range of ±700A. It outputs a ratiometric voltage signal (2.5 + G × Ip) with an accuracy of 3%, a bandwidth of 0~30kHz, and a response time of ≤6µs. Supply voltage is 5V DC (unipolar), and the operating temperature range is -40°C to +125°C.

The busbar mounting (baseplate mount) design is suitable for automotive motor control, battery management systems, and other applications. The HAH1DR series offers measurement ranges from 200A to 900A in the same package, enabling flexible platform-based selection. This model serves as a core current monitoring component for medium-to-high power electric drive and energy storage systems.

LEM HAH1DR 700-S Key Technical Specifications

LEM HAH1DR 700-S Key Advantages

Open-Loop Hall Technology, Non-Contact Measurement: No complex compensation coils required, compact structure, no insertion loss, does not interfere with primary circuit power transmission, fast response (≤6µs), suitable for automotive dynamic current monitoring

700A Rated Current, Covering Mainstream Automotive Applications: Rated 700A, measuring range ±700A, with the same housing supporting flexible switching between ±200A to ±900A ranges — adapts to measurement needs of different power class electronic control units

-40°C to +125°C Ultra-Wide Operating Temperature: Automotive-grade wide temperature design, adapts to extreme environmental temperature variations, ensuring stable operation under harsh conditions

Busbar Mounting Design, Compact Structure: Optimized for direct copper bar installation, easy to integrate into battery packs, inverters, and motor controllers

3% Accuracy: Meets accuracy requirements for automotive motor control and battery management current measurement

Ultra-Low Thermal Drift: Optimized core materials and circuit design deliver extremely low thermal drift and thermal sensitivity drift, ensuring stable measurement accuracy across the full temperature range

Wide Frequency Bandwidth: Accurately captures current signals at different frequencies, adapting to current transient changes during vehicle startup, acceleration, braking, and other operating conditions

Fully Ratiometric Output: Output voltage precisely replicates the primary current variation profile, providing real, reliable current data to the vehicle controller

Single +5V Supply: Seamlessly interfaces with automotive onboard power systems — no additional power conversion circuitry required, simplifying vehicle electrical integration

Why Choose the HAH1DR 700-S?

LEM HAH1DR 700-S Target Applications

Automotive Battery Management Systems (BMS): Power battery charge/discharge current monitoring, SoC estimation

Automotive Motor Control: EV traction motor, starter-generator current monitoring

Inverter Systems: Real-time current monitoring, ensuring stable startup and energy conversion

Uninterruptible Power Supplies (UPS): Input/output current monitoring

Renewable Energy Systems: PV inverters, wind turbine current monitoring

Industrial Drives: Pumps, fans, elevators, forklifts — equipment control/monitoring