LT1005-T/SP31，LT 1005-T/SP31

‌LT1005-T/SP31 Product Details: The Industrial Benchmark for High-Current Closed-Loop Measurement

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LT1005-T/SP31 ‌Product Description‌
The LT1005-T/SP31 is a high-performance closed-loop Hall effect current sensor from LEM, specifically engineered for precise measurement of DC, AC, and pulsed currents up to 1000 A RMS. Utilizing zero-flux compensation technology, it achieves galvanic isolation between the primary and secondary circuits, delivering a linear current output proportional to the measured current (200 mA full-scale). This ensures clean, drift-free signal output even in high-noise, high-EMC industrial environments. As the SP31 variant of the LT1005-S series, it matches the SP30 in core electrical performance but benefits from enhanced batch consistency and refined packaging, making it the ideal sensing core for systems requiring “design once, serve for life” reliability.

LT1005-T/SP31 ‌Key Features‌

‌Ultra-High Precision Closed-Loop Architecture‌: Achieves ±0.4% overall accuracy through magnetic flux balancing, far surpassing open-loop sensors. Effectively eliminates temperature drift and zero-point offset, ensuring stable output across the -10°C to +85°C operating range.

‌Lossless High-Current Measurement‌: Rated for 1000 A RMS with transient overload capability up to 2000 A. Features a large 40.5×40.5 mm through-hole design, enabling installation without interrupting the main circuit—minimizing insertion loss and thermal buildup.

‌Wide-Range Dual Power Supply‌: Compatible with ±15 V to ±24 V bipolar supply voltages, enhancing integration flexibility across diverse industrial power systems and reducing power design complexity.

‌Current-Mode Output with Superior Noise Immunity‌: Outputs a 200 mA full-scale proportional current signal instead of voltage, offering inherent immunity to common-mode noise. Ideal for long-distance transmission and high-EMC industrial control applications.

‌Industrial-Grade Environmental Resilience‌: Encased in UL94V-0 flame-retardant material, resistant to vibration, dust, and moisture—designed for long-term operation in harsh industrial and outdoor enclosures.

‌Full-Bandwidth Response Capability‌: Supports DC to 100 kHz measurement bandwidth, accurately capturing current transients, harmonics, and switching noise—perfect for variable frequency drives, inverters, and welding power systems.

LT1005-T/SP31 ‌Technical Specifications‌

‌Rated Current‌: 1000 A RMS

‌Measurement Range‌: 0 to ±2000 A (transient)

‌Supply Voltage‌: ±15 V to ±24 V (bipolar)

‌Output Type‌: Proportional current output (200 mA full-scale)

‌Accuracy‌: ±0.4%

‌Response Time‌: ≤1 µs

‌Operating Temperature‌: -10°C to +85°C

‌Insulation Voltage‌: 3800 V RMS, compliant with EN 50178 safety isolation standard

‌Mounting Method‌: Panel mount, through-hole aperture 40.5 mm × 40.5 mm, compatible with standard bolt fixation

‌Certifications‌: Complies with EN 50155 (railway), EN 50178 (industrial electrical equipment), RoHS, REACH

LT1005-T/SP31 ‌Applications‌
The LT1005-T/SP31 serves as the gold standard for current monitoring in high-power industrial systems, widely deployed in:

Industrial variable frequency drives and high-power servo systems, enabling torque closed-loop control and overcurrent protection

Large-scale photovoltaic and energy storage inverters, supporting precise grid-current regulation and maximum power point tracking (MPPT) feedback

Electric vehicle DC fast-charging stations, providing real-time monitoring of high-power charging processes to ensure safety and efficiency

Railway traction converters and locomotive power systems, enabling energy recovery, braking control, and fault diagnosis

High-frequency welding power supplies, ensuring arc stability and consistent current waveform for superior weld quality

Uninterruptible power supplies (UPS) and high-power switch-mode power supplies, delivering high-accuracy input/output current monitoring and protection

‌Why Choose LT1005-T/SP31 This Model‌
The LT1005-T/SP31 does not chase peak specifications—it delivers ‌industrial-grade reliability, long-term supply continuity, and zero-change risk‌. In equipment lifecycles spanning over a decade, replacing a sensor model means re-certification, re-tuning, and potentially costly downtime. The SP31 variant, electrically identical to SP30, ensures seamless cross-batch and cross-line replacement through superior manufacturing consistency. Its current-output architecture, wide-temperature resilience, and EMI robustness make it the preferred choice in high-noise, high-power environments. Choosing the LT1005-T/SP31 is not selecting a sensor—it is selecting ‌engineering certainty‌, validated by tens of thousands of global installations. It does not shout—but it never fails.