LT4000-T/SP40 High-Current Closed-Loop Hall-Effect Sensor

LT4000-T/SP40 Master 4000A High Current with Precision, Empowering High-End Industrial Equipment

In rail transportation, heavy-duty drives, and new energy systems, the accuracy and reliability of current measurement directly impact system stability and safety. The LT4000-T/SP40, a flagship ultra-high-precision closed-loop Hall-effect current sensor from LEM, is specifically designed for 4000A-level high-current measurement scenarios. With exceptional accuracy, ultra-fast response, and superior electrical isolation, it sets a new benchmark for high-end industrial equipment current monitoring.

LT4000-T/SP40 Core Advantages: Redefining High-Current Measurement

Ultra-High Accuracy – within 0.5%
Featuring advanced closed-loop Hall-effect technology, the LT4000-T/SP40 maintains ±0.5% accuracy across the entire operating temperature range. Every data acquisition is trustworthy, providing a solid foundation for system control and fault diagnosis.

Ultra-Wide Measuring Range – Withstands Current Surges
Rated at 4000 A (RMS), the sensor can reliably measure up to 6500 A. It remains stable under transient overloads or inrush currents, building a robust safety barrier for equipment operation.

Microsecond Response – Captures Current Transients
With a response time ≤ 1 μs and a wide frequency range from 0 to 100 kHz, the sensor precisely captures every transient change in DC, AC, or pulsed currents, meeting the stringent real-time requirements of high-frequency drive systems.

1000mA High Output Current – Flexible Interface Integration
Unlike many models in its class, the LT4000-T/SP40 delivers a 1000 mA output signal. Its higher drive capability simplifies connections to various measurement and protection devices, significantly reducing system integration effort.

±24V Dual Power Supply – Stable Operation Across Wide Temperature Range
Designed with industrial-grade ±24 V bipolar power supply and an operating temperature range of -25°C to +70°C, the sensor delivers consistent accuracy and response even under extreme temperature variations.

Reliable Isolation – Safety Assured

Full electrical isolation between the primary (high-power) and secondary (electronic) circuits protects downstream measurement and control circuits from high voltage and current threats, fundamentally ensuring operator and equipment safety.

Easy Installation – Broad Compatibility

The LT4000-T/SP40 features a panel-mount, basefixing design with a 102 mm through-hole aperture that accommodates large busbars or cables. Installation is straightforward without disassembling existing wiring, greatly reducing retrofit and maintenance time.

LT4000-T/SP40 Typical Applications

Rail Traction Systems – Current monitoring in traction converters for high-speed trains and urban transit, optimizing power distribution and improving efficiency and reliability.

Industrial Motor Drives – Real-time current feedback for AC variable frequency and servo drives, providing a solid data foundation for precision control.

Renewable Energy Generation – Current measurement and protection in wind and solar inverters, ensuring safe and efficient operation of renewable power systems.

High-Power Supplies & UPS – Key current monitoring nodes in uninterruptible power supplies and industrial power equipment, guaranteeing stable and reliable power delivery.

Welding Equipment – Instantaneous current measurement in high-power welding power sources, enabling high-quality welding processes.

LT4000-T/SP40 Technical Specifications at a Glance

Why Choose the LT4000-T/SP40?

In high-current measurement, sensors must be not only accurate but also reliable. LEM, a world-leading provider of electrical measurement solutions, has field-proven its LT series sensors for decades across demanding applications – industrial, rail, energy & automation, and automotive – covering a measurement range from 0.1 A to 20,000 A. The LT4000-T/SP40 embodies LEM’s decades of technological expertise, delivering industry-leading performance in accuracy, response, isolation, and temperature range. It is the ideal choice for building highly reliable, high-performance industrial measurement and control systems.