Product Detail: IT400-S ULTRASTAB Ultra-High Precision Closed-Loop Fluxgate Current Transducer

Product positioning note: The IT400-S ULTRASTAB is a high-precision current transducer (sensor), not a voltage stabilizer or inverter. Its core function is to proportionally convert a large primary current into a smaller secondary current for accurate measurement and monitoring.

IT400-S ULTRASTAB Accuracy to the digit, stability to the extreme

In applications demanding the utmost precision in current measurement – such as medical imaging, high-precision power supplies, and MRI gradient amplifiers – a current sensor that combines ultra-high accuracy, exceptional stability, and high safety is the key to system reliability. The IT400-S ULTRASTAB is built for exactly that: based on closed-loop fluxgate technology, it pushes current measurement precision and stability to new heights.

Precision that redefines standards – error as low as 0.0044%

The IT400-S ULTRASTAB uses LEM’s patented closed-loop IT-type fluxgate technology, eliminating traditional Hall elements and achieving ultra-high precision through a “zero-flux detection” mechanism. At the rated 400A current, overall accuracy reaches 0.0044% – meaning that when measuring 400A, the error is only about 0.0176A, almost negligible.

Linearity error over the full range is better than 3ppm, electrical offset current is within 40ppm, and monthly offset stability is only 1ppm – accuracy does not drift over long-term use. As engineers often say: “A good sensor never lies” – the IT400-S makes every current reading trustworthy.

Stable operation across multiple scenarios – temperature drift as low as 1ppm/K

The closed-loop fluxgate design gives the IT400-S excellent temperature stability. Over the 10°C to 50°C operating range, the temperature coefficient is as low as 1ppm/K – for every 1°C change in ambient temperature, measurement drift is less than one part per million. Initial offset is between 40-80ppm, with offset drift as low as 0.5-2.5ppm/K.

Even with a wide temperature range (storage temperature -40°C to +85°C), the IT400-S maintains ±0.5% accuracy, with a temperature drift coefficient 42% lower than the industry average. Extremely low DC offset and outstanding low temperature drift ensure consistent measurement accuracy in industrial sites, laboratories, medical equipment and other environments.

Wide frequency response · High immunity · Safe and reliable

Wide bandwidth: ±1dB bandwidth up to 150kHz, -3dB bandwidth extends to 500kHz – capable of tracking fast current changes with di/dt = 80A/μs.

Fast response: Response time <250μs, delay time tD90 ≤1μs – captures transient current changes at “lightning speed”.

High overload capability: Single pulse (100ms) withstand current up to ±2000A – remains stable under transient high current shocks without damage.

Insulation safety: Primary-to-secondary AC test voltage 5.4kV (50/60Hz, 1min); impulse withstand voltage 9.9kV; creepage distance and clearance both 11mm. Complies with EN IEC 61010-2-030 and other international standards.

Low noise design: Primary-referred equivalent noise current ≤0.05ppm (0-10Hz band), only 8ppm at 50kHz – avoids interference with the original circuit.

About LEM – Global leader in electrical measurement

The IT400-S ULTRASTAB comes from LEM, a Swiss group – the world’s leading brand in electrical measurement solutions, with deep expertise and market recognition in EV, charging infrastructure, industrial automation and beyond.

CE certified; housing made of UL94-V0 flame-retardant material for safety

Panel-mount design with Φ26mm aperture; compatible with IT60-400 series mounting templates for seamless integration

D-Sub 9 male connector output; current-type secondary output (instantaneous 200mA) – plug and play

Five reasons to choose the IT400-S ULTRASTAB

IT400-S ULTRASTAB Typical applications

Feedback element for high-performance MRI gradient amplifiers

Precision current regulation devices & high-stability inverters

EV charging pile current detection

Photovoltaic inverters & energy storage systems

Laboratory power analyzers & calibration equipment

Industrial automation production line current monitoring

Medical equipment energy measurement

IT400-S ULTRASTAB Quick specifications