HAT500-S Hall Effect Open-Loop Current Transducer

HAT500-S Product Overview

The HAT500-S is a high-precision Hall-effect open-loop current transducer from the globally renowned brand LEM. Designed for electronic measurement of DC, AC, pulsed, and mixed currents, it provides reliable galvanic isolation between the primary circuit (high-voltage, high-power side) and the secondary circuit (electronic control side). It is ideal for current sensing applications that demand high accuracy and robustness in industrial environments.

Rated at 500 A and capable of measuring up to ±1500 A, the HAT500-S comfortably handles everything from normal loads to momentary overloads. Its compact modular design and excellent electrical performance make it a popular choice in industrial drives, power supplies, renewable energy, railway transportation, and automotive electronics.

HAT500-S Six Key Advantages

1. High Accuracy – Error ≤ ±1 %
At rated primary current, the HAT500S achieves an accuracy of ±1 % FS with a linearity error of also ≤ ±1 %. The data you collect is trustworthy, giving you precise insight into your system's operating status.

2. Wide Measuring Range – Up to 3 × Rated Value
The standard range is 500 A, while the maximum measurable range extends to ±1500 A – three times the rated current. There is no need to install a larger transducer for occasional transient overloads; a single HAT500S covers both rated loads and extreme surges.

3. High Galvanic Isolation – 4.9 kVrms
Primary-to-secondary isolation is rated at 4.9 kVrms. Together with a UL94-V0 flame-retardant insulated housing, this forms a solid barrier that safeguards both personnel and equipment.

4. Fast Response – 5 µs
Response time is less than 5 µs, allowing the transducer to capture current changes in real time. This gives control systems valuable milliseconds for fast regulation and protective action. The 25 kHz bandwidth covers DC to high-frequency currents, meeting the needs of high-dynamic detection.

5. Strong Anti-Interference Capability
Thanks to the Hall-effect open-loop principle and optimised electromagnetic shielding, the HAT500-S is highly immune to external disturbances. Even in harsh industrial environments with inverters and high-power supplies, it delivers stable, accurate outputs without signal corruption.

6. Compact Design – Easy and Flexible Mounting
With a small footprint and a weight of only about 300 g, the HAT500-S saves valuable cabinet space. It supports contact-free, busbar, or clamp mounting. You can fix it with M4 screws via the base plate or connect it quickly using a connector. The modular design makes installation and maintenance efficient.

HAT500-S Key Technical Specifications

HAT500-S Typical Applications

With its outstanding performance, the HAT500-S plays an indispensable role in many industries:

Industrial drives – Real-time current monitoring and closed-loop control in inverters and servo drives, ensuring smoother and more efficient motor operation.

Power supplies – Widely used in switched-mode power supplies (SMPS), uninterruptible power supplies (UPS), and welding power sources for accurate load current detection and power management.

Renewable energy – Employed in solar inverters, wind power systems, and energy storage units to support efficient grid connection and intelligent management of clean energy.

Railway & transportation – Used in main traction and auxiliary converters, meeting the stringent requirements of instantaneous current/voltage detection in the railway industry.

Automotive electronics – Enables precise current measurement in EV battery management systems (BMS), motor drive control, and charging systems, contributing to safe and efficient vehicle operation.

Building & facilities – Improves torque control and smooth start/stop in elevators and escalators, enhancing passenger comfort while optimising energy use.

Why Choose the LEM HAT500S?

In precision industrial applications, an unreliable current sensor can cause false alarms, protection failures, or even system shutdown. The HAT500S comes from LEM, the worldleading brand in current transducers with decades of proven reliability in industrial, railway, energy, and automotive sectors. By choosing the HAT500S, you get:

Original quality assurance from a global brand

Stable performance repeatedly validated in realworld industrial environments

Flexible mounting solutions for easy system integration

Professional technical support and comprehensive service