Patent ID: 7830238

Claim:
A device comprising a core, a winging, an input terminal connected to a source of alternating current supplying alternating current to said winding and an output terminal, said device adapted to provide continuously incremental permeability in said core, proportional to the alternating current through said winding, resulting in a proportional inductance and inductive reactance and accordingly a proportional current limiter impedance, to limit the current to said output terminal, characterized in that: said core is at least one uniform silicon steel body having a central opening and a plurality of magnetic domains, all of said magnetic domains being pre-aligned radially outward and inward and intended to carry an induced circumferential magnetic field resulting in a magnetic flux around said central opening in said body; said incremental permeability being incrementally proportional to said circumferential magnetic field, said incremental permeability being low for low magnetic field strength in a circumferential direction and increasing with higher magnetic field strength; and said winding being the only coil in said device and being an electrically conducting material wound on said core; a portion of said winding passing through said opening.