FRS 3000-SUI

LEM FRS 3000-SUI Open Loop Coreless Integral Current Transducer

LEM FRS 3000-SUI Product Overview

The FRS 3000-SUI is an open-loop coreless integral current transducer from LEM's FRS Series, designed for accurate measurement of DC, AC, and pulsed currents with galvanic separation between the primary and secondary circuits. The device employs LEM's OLCI (Open Loop Coreless Integral) technology, which integrates Rogowski coil and Hall element arrays to deliver high reliability and stability in demanding industrial, traction, and trackside environments.

Rated for 3000 A nominal primary current with a measuring range of 0 to 9000 A, the device provides an instantaneous 4-20 mA current output. Supply voltage range is 10 to 28 V DC. Accuracy is 0.65% with linearity error of ±0.35%. Bandwidth is DC to >1 MHz with response time < 400 ns. Sensitivity is 1.78 µA/A. Operating temperature range is -40°C to +85°C. Housed in a lightweight design with 104 mm aperture for rectangular busbars, the device features an M12 field connector for industrial interfacing. Mass is approximately 80% lighter than traditional sensors. Country of origin is Switzerland.

LEM FRS 3000-SUI Key Specifications

LEM FRS 3000-SUI Key Advantages

The FRS 3000-SUI employs OLCI (Open Loop Coreless Integral) technology with no magnetic core and no secondary copper windings, eliminating magnetic offset and delivering high bandwidth (>1 MHz) and very low delay time (<400 ns). The coreless design ensures measurement accuracy even under high dI/dt and overcurrent conditions, with no risk of magnetic saturation. The 104 mm aperture accommodates a wide range of rectangular busbar dimensions.

The device offers significant sustainability advantages over traditional sensors: 85% lower energy consumption than comparable closed-loop sensors, 80% lighter than traditional sensors, 100% recyclable materials at end of life, and single-supply operation (10-28V) reduces system cost and complexity.

The factory calibrated device requires no field calibration. M12 field connector simplifies installation and maintenance in industrial environments. Wide operating temperature range of -40°C to +85°C supports harsh trackside and industrial applications.

LEM FRS 3000-SUI Typical Applications

Wind turbine power converters
Electrolysers and high-power industrial processes
High-power drives and motor control
Traction and trackside railway applications
Industrial power conversion systems
Renewable energy generation equipment
Battery energy storage systems
High-current monitoring and protection systems

Why Choose the LEM FRS 3000-SUI?

The FRS 3000-SUI combines 3000 A nominal current, 0 to 9000 A measuring range, and >1 MHz bandwidth in a lightweight, coreless design from LEM, a global leader in current sensing technology. It delivers stable, reliable, and accurate high-current measurement for demanding industrial, traction, and renewable energy applications while offering significant sustainability benefits through reduced energy consumption and recyclable materials. The OLCI technology with Hall element integration ensures superior temperature stability and signal integrity compared to traditional open-loop sensors. With active product status and compliance with international standards including EN 50155 for railway applications, the FRS 3000-SUI is a versatile solution for high-power current sensing requirements.