LT2005-S | Closed-Loop Hall Effect High Current Sensor

LT2005-S A sensor that makes high-precision current measurement simple and reliable

In industrial power systems, renewable energy equipment, and automation control, precise current measurement is the foundation for safe equipment operation and energy efficiency optimization. The LT2005-S is purpose-built for this mission – a closed-loop Hall effect high current sensor from LEM (Switzerland), delivering outstanding performance and reliability, trusted by engineers worldwide.

Core advantages of LT2005-S: Not just “measuring current”, but measuring it accurately and stably.

LT2005-S Key Specifications: Data that demonstrates capability

Why choose the LT2005-S?

Precision measurement: ±0.3% ultra-high accuracy, capturing even the smallest changes

The LT2005-S uses closed-loop Hall effect (magnetic balance) technology, continuously compensating to maintain magnetic flux balance, fundamentally eliminating core saturation and non-linearity errors. It achieves ±0.3% measurement accuracy and ±0.1% linearity. This level of precision makes it an ideal choice for demanding applications such as inverter control, servo drive closed-loop feedback, and precision power monitoring.

Working principle of closed-loop technology:

The core concept of magnetic balance technology is that the secondary coil generates a compensating magnetic field that cancels the primary current's magnetic field, keeping the magnetic core at zero flux, thereby minimizing the impact of external interference. Compared to traditional open-loop sensors, closed-loop technology offers superior immunity to external interference.

Ultra-fast response: <1 microsecond, instantly capturing current transients

With a response time as low as 1 microsecond, the LT2005-S can send alarm signals at the first moment of short circuits or overcurrent events. In applications such as drives, power supplies, and welding equipment, this feature captures transient impacts early, protecting expensive equipment from damage.

High isolation withstand voltage: safe and reliable for high-voltage environments

The LT2005-S features a UL 94-V0 certified insulated plastic housing, with fully electrical isolation between primary and secondary circuits. The isolation withstand voltage can reach up to 12 kV AC for 1 minute. In high-voltage power systems, reliable electrical isolation is the first line of defense for operator safety and stable operation of downstream circuits.

Wide temperature range: -40℃ ~ 125℃, unfazed by harsh environments

For industrial sites, temperature adaptability directly determines long-term equipment reliability. Some variants of the LT2005-S series support a wide operating temperature range from -40℃ to 125℃ and are AEC-Q100 qualified, suitable for harsh industrial and automotive applications.

Closed-loop Hall effect: six core advantages

The LT2005-S adopts closed-loop Hall effect technology, offering the following core advantages:

Excellent measurement accuracy

Superior linearity

Ultra-low temperature drift

Optimized response time

Wide frequency bandwidth

High immunity to external interference

Innovation-driven, quality assured

LEM is a global leader in electrical measurement sensors, headquartered in Geneva, Switzerland, with over 40 years of history and manufacturing/R&D facilities worldwide. All products comply with RoHS and international safety standards (e.g., EN 50178), following strict quality management systems to ensure reliable performance, meeting the highest standards of global industrial customers.

Multi-scenario applications

The LT2005-S is widely used in the following fields as an ideal choice for high-precision current monitoring:

Power & Energy Systems

Smart grid current monitoring

PV inverter output detection

Energy storage system charge/discharge monitoring

Wind turbine current measurement

Industrial Automation

AC/DC drives and servo drives

Industrial power supplies and UPS

Welding equipment current monitoring

Mill/traction drive systems

Transportation

Railway traction current monitoring

Metro auxiliary converter monitoring

800V electric vehicle drive platform current sensing

Power Electronics Equipment

DC/AC converters and switch-mode power supplies

Battery management systems (BMS)

EV charger current detection and overload protection

Why do engineers trust the LT2005-S?

High accuracy, wide range coverage – Ultra-wide dynamic range from 0.1A to 20,000A, covering from milliamps to tens of thousands of amps, meeting diverse application needs with a single sensor.

EMC and interference immunity – Built-in magnetic shielding and anti-EMI design ensure stable operation in noisy environments such as drives and motor startups.

Non-contact measurement – Busbar through-hole mounting, no need to disconnect existing circuits, easy maintenance and high safety.

No insertion loss – Compared to traditional shunts and current transformers, Hall effect sensors introduce almost no additional power loss or voltage drop in the primary circuit.

Broad compatibility – Supports analog outputs (voltage/current), seamlessly interfacing with PLCs, microcontrollers, and industrial control systems.