The sensor is a small, non-intrusive, clamp-on device that uses Hall Effect technology to sense current flow through a #12 AWG or #10 AWG wire. The chip is a single-axis, integrated, magnetic, field sensor based on the Hall Effect. The circuit is fabricated using a conventional CMOS technology, with an additional ferromagnetic layer. The ferromagnetic layer is used as a magnetic flux concentrator, providing a high magnetic gain. Therefore, the circuit features very high magnetic sensitivity, a low offset, and low noise. The clip enclosure contains a small mu-metal strip for additional shielding against external fields and for amplifying internal fields. It is capable of sensing microsecond transients (AC & DC).