LT4000-S/SP32，LT 4000-S/SP32

LT4000-S/SP32 High-Current Closed-Loop Hall Effect Current Sensor

The Guardian of Precision – Infusing Reliable Intelligence into Powerful Currents

In the surging pulse of modern industry, current is the lifeline – and precise current measurement is the cornerstone that protects that lifeline. The LEM LT4000-S/SP32 high-current closed-loop Hall effect current sensor is the discerning eye born to carry heavy responsibility. It does not obstruct the current; it listens to the current’s breath. With the reliability and stability of Swiss precision engineering, it transforms a torrent of electrons into a calm, accurate signal.

When precision is a matter of safety, and stability determines success – the LT4000-S/SP32 is the partner you can trust.

LT4000-S/SP32 Key Technical Specifications

LT4000-S/SP32 Core Advantages – Why the LT4000-S/SP32 Sets the Benchmark for Industrial Measurement

Closed-loop Hall technology – ultimate precision: Utilizes closed-loop (zeroflux / compensation) Hall effect technology to provide galvanic isolation between the high-power primary circuit and the secondary electronics. Measures DC, AC, pulsed, and irregular waveforms without commonmode interference.

±0.5% accuracy, <0.1% linearity: Overall accuracy of ±0.5% at rated current and <0.1% linearity deliver true, drift-free current data – free from measurement drift concerns.

< 1 µs response time – microsecond speed: Captures instantaneous current transients with exceptional fidelity. Even with di/dt up to 50 A/µs, it faithfully reproduces motor inrush currents or fast converter switching transients – no blind spots.

100 kHz bandwidth – covers critical frequencies: DC to 100 kHz bandwidth covers the essential frequency range for industrial drives, switch-mode power supplies, and more. Captures fundamental and major harmonics, providing a complete picture for harmonic analysis and waveform reconstruction.

Zero insertion loss & high noise immunity: Non-contact measurement without breaking the current path – no heat generation, no efficiency loss. Excellent immunity to external electromagnetic interference ensures stable output even in noisy environments like VFDs or welding stations.

Excellent thermal drift – stable under all conditions: Low temperature drift design maintains accuracy from -25°C to 70°C, ideal for harsh environments such as outdoor substations or steel mills.

102 mm aperture – easy installation: 102 mm diameter through-hole allows main busbars or cables to pass directly without disconnecting or modifying existing wiring. Panel-mount design with four φ10.5 mm fixing holes and industrial M5 terminals – tool-free installation.

6 kV isolation – safe and reliable: 6 kV dielectric test voltage ensures operator and downstream circuit safety. Insulating housing meets UL 94-V0 flammability rating, ready for demanding environments.

LT4000-S/SP32 Typical Applications

AC variable speed drives & servo motor drives: Precisely monitor motor current for closed-loop vector control, improving system dynamic response.

Static converters for DC motor drives: Real-time current feedback for optimal converter control.

Uninterruptible power supplies (UPS) & switch-mode power supplies (SMPS): Monitor input/output current for overload protection and power factor correction.

Renewable energy generation (wind converters, PV inverters): Capture fluctuating currents in wind farm converters to ensure grid power quality.

Battery power & energy storage systems: Monitor charge/discharge current for optimized battery management and extended system life.

Welding power sources & industrial high-current equipment: High noise immunity delivers stable output in electrically noisy environments.

Energyintensive industries (aluminum smelting, chloralkali, metal refining): Long-term online DC current monitoring supports energy efficiency management and equipment protection.