The AC current sensor is based on Current transformers, it transforms the big AC current to little, and then convert to voltage with the build-in resistor so users can get the AC current value via measuring the output voltage with any microcontroller. https://elecena.pl/product/6057219/non-invasive-ac-current-sensor-30a 2016-05-07 https://elecena.pl/product/6057219/non-invasive-ac-current-sensor-30a 2025-12-18