FRS - Open Loop Coreless Integral Sensors
The FRS Series consists of open‑loop, coreless integral current sensors designed for accurate measurement of DC, AC, and pulsed currents, while ensuring full galvanic isolation between primary and secondary circuits. Using OLCI (Open Loop Coreless Integral) technology, FRS sensors deliver high reliability and stability in demanding industrial, traction, and trackside environments.
With a measuring capability of up to 9000 A, the FRS Series is built for high‑current applications where compact integration is essential. These sensors feature a 104 mm aperture and are available with either a 4–20 mA current output or a 0–5 V instantaneous voltage output, offering flexibility for control, monitoring, and protection systems.
FRS – Features and benefits
Main characteristics
- Hall effect Open Loop Coreless Integral (OLCI) current sensor
- Unipolar or bipolar measurement up to 9000 A
- Instantaneous outputs: 4–20 mA current output or 0–5 V voltage output
- +12 V or +24 V DC power supply
- Galvanic isolation between primary and secondary circuits
- Factory calibrated
- High bandwidth > 1 MHz
- Very low delay time (< 400 ns)
Benefits
- Wide measurement range for high‑current monitoring in compact form factor
- No magnetic offset thanks to coreless construction
- Low consumption and minimal losses
- Wide range of rectangular busbar dimensions
- Lightweight mechanical design
- M12 field connector for industrial‑grade interfacing
Typical applications
The FRS Series is widely used in high‑power industrial, traction, and trackside applications that require fast, accurate current measurement, such as:
- Wind turbine power converter
- Electrolyser
- High power drives
FRS - Open Loop Coreless Integral (OLCI) current sensors
FRS transducers - Standards compliance
| FRS Series |
|---|
| IEC 62477-1: 2022 |
| IEC 61800-5-1: 2022 |
| IEC 62109-1: 2010 |
| IEC 61010-1: 2010 |
| EN 50155: 2021 |
| IEC 61992-7-2: 2006 |
| IEC 61010-2-030: 2017 |
| UL 61010-1: 3ED 2022 |
LEM FRS – Download & Technical Characteristic
FRS Sensors – ASK FOR SAMPLES / QUOTATIONS
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