LT2005-S/SP2 Closed-Loop Hall-Effect Current Sensor – Precision Enables

High-Power Current Monitoring

LT2005-S/SP2 High-accuracy high-current measurement, tailored for demanding industrial applications

In modern power electronics systems, accurate, stable, and safe high-current measurement is the core foundation for efficient control and system protection. The LT2005-S/SP2 is a high-performance current sensor designed precisely to meet this need. As a flagship model in LEM’s LT2005 series, the LT2005-S/SP2 is specially engineered for demanding applications such as traction and high-power drives. With its outstanding accuracy, fast response, and galvanic isolation, it helps engineers confidently tackle the challenges of high-current monitoring.

LT2005-S/SP2 Key specifications

LT2005-S/SP2 Product highlights

Closed-loop Hall-effect technology – safe isolated measurement

The LT2005-S/SP2 uses closed-loop Hall-effect (magnetic balance) principle. A compensation circuit achieves high-precision linear conversion from the primary high current to the secondary measurement signal. The measuring circuit is galvanically isolated from the high-voltage primary circuit, enabling safe measurement of instantaneous DC, AC, and pulsed currents without direct contact. This ensures system safety and personnel protection.

±0.4% accuracy, < 1 μs transient response

With ±0.4% high accuracy and ≤ ±0.1% linearity, the sensor provides stable and reliable feedback even at 2000 A. Response time below 1 microsecond enables very fast reaction to abnormal conditions such as short circuits or overloads, gaining valuable time for system protection.

DC ~ 100 kHz wideband response – covers all waveform types

The frequency bandwidth from DC to 100 kHz (-1 dB) accurately captures steady DC, power-frequency AC, and high-frequency PWM waveforms alike, delivering a faithful instantaneous output signal. This makes the sensor ideal for variable frequency drives, switching power supplies, high-power drives, and many other power systems.

Large aperture – flexible busbar accommodation

The primary aperture (60.5 × 20.5 mm rectangular or 56 mm diameter) allows easy passage of multiple wires, copper busbars, or round conductors without cutting or modifying the original circuit. Installation is simple, saving retrofitting costs.

Wide temperature range, reliable in harsh environments

The sensor operates from -40°C to +70°C and is designed for outdoor and harsh industrial environments. Low temperature drift ensures consistent accuracy across the entire temperature range.

Low insertion loss – energy efficient

The sensor introduces virtually no power loss or voltage drop in the measured circuit – an advantage in energy-conscious applications.

LT2005-S/SP2 Broad application fields

Traction systems & rail transport

Specifically optimised for traction systems, suitable for high-speed trains, metros, trams, and other rail vehicles – for traction converters, auxiliary converters, choppers, and braking energy recovery systems.

High-power variable frequency & servo drives

Widely used in AC frequency converters, AC servo drives, and DC motor drives, providing accurate current feedback signals to significantly improve motor control performance.

Power electronics & power supplies

Ideal for current monitoring and closed-loop control in uninterruptible power supplies (UPS), switchmode power supplies (SMPS), welding power sources, induction heating equipment, etc., ensuring safe operation of critical assets.

Renewable energy & energy storage

In photovoltaic inverters, wind turbine generators, high-power EV chargers, and industrial/commercial energy storage systems, the LT2005-S/SP2 ensures efficient and stable operation of renewable energy equipment.

Process control & equipment protection

Widely used for high-current monitoring and equipment protection in steel & metallurgy, elevator controls, large fans/pumps, forklifts, and similar applications.

Why choose the LT2005-S/SP2?