LTC1000-SFC/SP1 High Current Closed-Loop Hall Effect Current Transducer

What is the LTC1000-SFC/SP1?

The LTC1000-SFC/SP1 is a closed-loop Hall effect high-current transducer from LEM (Switzerland), designed for demanding industrial environments that require high accuracy and reliability in current measurement. This model accurately measures DC, AC, and pulsed currents while providing full galvanic isolation between the primary (high-power) circuit and secondary (electronic) circuit, ensuring system safety and signal integrity.

Key Advantages – Why Choose the LTC1000-SFC/SP1?

Safety First: Powerful Galvanic Isolation Protection

In high-voltage, high-power industrial environments, safety is the top priority. The LTC1000-SFC/SP1 uses a professional magnetic-balance closed-loop Hall technology with a reinforced isolation test voltage of up to 13.4 kV RMS (AC) , effectively eliminating the risk of main control board damage caused by poor grounding or common-mode interference. This is not just a performance indicator – it is a safety guarantee for your system.

Superior Accuracy: ±0.4% High Measurement Precision

At a rated current of 1000 A, the transducer achieves an overall accuracy of better than ±0.4% at +25°C, and maintains accuracy within ±1% over the full operating temperature range (-40°C to +85°C). Linearity is better than ±0.1% , significantly reducing nonlinear distortion in the signal acquisition path and providing a true and reliable current feedback signal for downstream control algorithms.

Fast Response: 1 µs Dynamic Capture

With a response time of less than 1 µs, the device accurately follows current slew rates (di/dt) greater than 100 A/µs. Whether it is a sudden load change in a closed-loop speed control system or a transient surge in a switching power supply, the LTC1000-SFC/SP1 captures it instantly.

Wide Temperature Range: -40°C to +85°C, AllEnvironment Operation

The transducer operates stably from -40°C to +85°C – from arctic cold to sealed, hot control cabinets. The thermal drift is controlled to within ±1 mA, ensuring minimal output fluctuation even at high temperatures.

Wide Bandwidth: DC to 100 kHz

Frequency bandwidth is DC to 100 kHz (-1 dB) , enabling measurement of pure DC bus currents as well as accurate capture of high-frequency harmonic components. This meets the complex current detection requirements of modern power electronics such as variable frequency drives (VFDs) and inverter outputs.

High Overload Capability: Withstands Surges Confidently

The device supports a measurement range up to ±2400 A and can withstand extreme current slew rates of 10 kA/ms during momentary overcurrent or load surges without damage.

LTC1000-SFC/SP1 Technical Specifications

LTC1000-SFC/SP1 Typical Applications

AC Variable Speed Drives and Servo Motor Drives

In VFD and servo drive systems, precise closed-loop current control directly determines torque accuracy and dynamic response. The high speed and linearity of the LTC1000-SFC/SP1 allow the motor control loop to track load changes in real time, achieving smoother operation and lower energy consumption.

Photovoltaic Inverters and Renewable Power Plants

The efficiency of photovoltaic (PV) plants heavily depends on real-time DC current monitoring. In a distributed PV project in Jiangsu Province (China), LEM LTC1000 series sensors maintained a linearity error within 0.3% even at a component temperature of 65°C – a 40% stability improvement over previous models. The 100 kHz bandwidth ensures accurate capture of PV array current ripple, maximizing MPPT efficiency.

Uninterruptible Power Supplies (UPS) and Switch-Mode Power Supplies (SMPS)

In UPS and SMPS systems, continuous monitoring of input/output current is essential for reliable operation. Low temperature drift ensures stable measurements over long-term operation, while zero insertion loss adds no extra burden to system efficiency.

Railway Traction and Auxiliary Power Systems

As a core model in LEM’s LTC1000 series designed for traction applications, this transducer can be installed horizontally or vertically. The primary conductor opening size is 42×12 mm or 42 mm diameter, making it suitable for current monitoring in train converters and auxiliary power systems.

Welding Power Supplies

In welding applications with largeamplitude, highslewrate pulsed currents, the LTC1000-SFC/SP1’s high overload capacity and fast response ensure stable welding processes and consistent weld quality.

LTC1000-SFC/SP1 vs. Competitors – Strength Comparison