Allegro acs711klctr 12ab t hall effect sensor ic overcurrent fault 4ma so 8 allegro acs711klctr 12ab t the acs711klctr 12ab t is a hall effect sensor that provides a precise solution for ac or dc current sensing in lt 100v audio communications systems and white goods the ic consists of a linear hall sensor which converts a current generated magnetic field to a proportional voltage the output voltage is proportional to ac or dc currents and the sensor has a 3 to 5 5v single supply operatio