Hall-effect current sensors are not a specific brand but a category of devices used to measure electric current by detecting the magnetic field generated around a conductor. These sensors are produced by various global companies, such as LEM (Switzerland), Allegro MicroSystems (USA), and Honeywell (USA). They serve industries like automotive, industrial automation, renewable energy, and consumer electronics. Key products include open-loop and closed-loop sensors, isolated current sensors, and integrated circuit solutions for accurate current measurement with high reliability and safety standards.