LEM HAS400-S/SP50 Hall Open-Loop Current Transducer

HAS400-S/SP50 Product Overview

The HAS400-S/SP50 is a high-performance Hall open-loop current transducer from LEM, a Swiss-based global leader in electrical measurement. Designed for AC and DC current measurement from 50A to 600A, this 400A-rated model is the workhorse of the HAS series. It uses the open-loop Hall effect principle, providing galvanic isolation between the primary and secondary circuits. The transducer accurately measures DC, AC, pulsed, and any irregular waveform currents under isolated conditions. With an ultra-wide ±900A measurement range, a fast 3µs response time, and a high isolation voltage of 3.6kVrms, the HAS400-S/SP50 is an ideal choice for industrial inverters, power supplies, renewable energy generation, rail transit, and many other applications.

HAS400-S/SP50 Key Specifications

Rated Primary Current (Nominal): 400A (theoretical value), with a ±900A maximum measurement range – ample overload margin

Output Signal: Instantaneous voltage output ±4V – directly compatible with mainstream control systems

Supply Voltage: ±15V bipolar supply, ensuring symmetrical output performance

Frequency Bandwidth: DC ~ 50kHz – covers complete DC to high-frequency AC signal measurement needs

Response Time: only 3µs – captures transient current changes quickly

Accuracy: ±1%, together with ±1% linearity, ensures reliable data

Isolation Voltage: 3.6kVrms – galvanic isolation between primary and secondary, meeting highvoltage safety standards

Operating Temperature: -10℃ ~ +80℃ – withstands harsh industrial environments

Maximum Supply Current: 15mA – ultra-low power consumption, barely loads the power supply

Mounting Type: Panel mount (the “S” suffix indicates panel-mount package) with a single through-hole aperture – easy installation

HAS400-S/SP50 Product Features

Open-Loop Hall Effect Technology
Mature open-loop Hall measurement principle offers a compact structure and high reliability, delivering stable performance during years of continuous operation.

Outstanding Electromagnetic Immunity
Optimized internal design and signal processing circuitry provide clean, stable current feedback even in high-EMI environments such as wind turbines and EV charging stations, ensuring stable operation of inverter systems.

Integrated Through-Hole Design
The single through-hole aperture allows installation without cutting existing circuits, greatly reducing system integration difficulty and maintenance costs.

High Safety Rating
PBT insulating housing, UL 94-V0 flame rating – complies with international safety standards.

Bidirectional Current Sensing
Supports measurement of both positive and negative currents, easily handling bidirectional loads.

High Scalability
Shares the same platform as HAS50HAS600 models. One design supports multiple rated currents, simplifying system upgrades and spare parts management.

HAS400-S/SP50 Applications

With its outstanding performance, the HAS400-S/SP50 is widely used in the following key applications:

AC Variable Frequency Drives (VFDs): Precise current feedback is the foundation of vector control. This transducer monitors motor current in real time, enabling highprecision speed regulation and fast overcurrent/overload detection.

Static Converters for DC Motor Drives: Provides accurate current detection for DC motor drive systems, ensuring smooth and stable motor starting, speed regulation, and braking.

Industrial Power Supplies & UPS Systems: Current detection and protection in uninterruptible power supplies and switching power supplies, monitoring current changes in the main power circuit accurately.

Renewable Energy Generation Systems: DC/AC side current measurement in wind turbine converters and photovoltaic inverters, delivering stable, reliable current feedback even in strong electromagnetic interference environments.

EV Charging Infrastructure: Precisely measures charging current, providing critical data for charging power management and battery protection.

Rail Transit Vehicles: Current detection and protection in main traction and auxiliary converters, meeting the stringent requirements for wide temperature range, vibration resistance, and high reliability.

Elevators & Smart Building Equipment: Monitors motor current changes to enable obstacle detection and smooth speed regulation, ensuring elevator safety.

Industrial Automation Equipment: Motor current control and power monitoring in industrial robots, cranes, machine tools, and other equipment.

Why Choose the HAS400-S/SP50?

Brand Trust & Reliability
LEM is the global leader in electrical transducers, covering currents from 0.25A to 10kA and voltages from 10V to 6400V, and offers a 5year warranty. Products carry CE, UL, and ISO9001 certifications.

In Stock & Ready to Ship
Major distributors such as LCSC keep regular stock. Minimum order quantity is just 1 piece – buy as needed, no waiting.

Complete Technical Support
Full documentation available: Chinese and English datasheets, PDF user manuals, pinout definitions, pin arrangement diagrams, and PCB footprint drawings. Engineers can quickly complete selection and design verification.