LEM Current Sensor Distributor | Closed-Loop and Open-Loop Hall

BeiLuo supplies genuine LEM current transducers that measure DC, AC and pulsed current with galvanic isolation between the primary conductor and the low-voltage secondary circuit. LEM's portfolio spans closed-loop (compensated) Hall sensors and open-loop Hall sensors, from compact PCB modules such as the LA and LTS families to panel-mount industrial types such as the HAS series and the widely used HLSR open-loop range. A closed-loop transducer drives a secondary current that exactly balances the primary ampere-turns, so it offers high accuracy, low offset drift and a fast response, which suits motor drives, servo inverters and precision power measurement. An open-loop transducer measures the magnetic field produced by the primary current directly, so it is smaller, lower cost and needs less power, making it ideal for solar inverters, power supplies and battery monitoring where moderate accuracy is enough. Every LEM current sensor provides galvanic isolation, so control electronics stay protected from high common-mode voltages, and many models offer a voltage or current output that interfaces directly with an MCU ADC. BeiLuo keeps fast-moving LEM current transducer models in regional stock, ships them with import declaration, certificate of origin and RoHS documents, and supports selection, primary-conductor sizing, isolation planning and PCB layout with an in-house FAE team. Whether you need a 50 A closed-loop module for a three-phase drive or a compact 20 A open-loop sensor for a solar boost stage, our engineers help you match nominal current, measuring range and mounting to the job.