Patent ID: 7230414

Claim:
A current sensor comprising: (a) a first sensor segment including: (i) a first magnetically permeable core comprising a sector of a torus having a planar cross-section bounded by a closed curve, said planar cross-section rotated about an axis in said plane of said cross-section but not intersecting said plane of said cross-section; (ii) a winding including at least one turn substantially encircling said cross-section of said core; and (iii) a support arranged to retain said first magnetically permeable core in a relationship to a mounting surface; (iv) a first segment housing substantially enclosing said first magnetically permeable core including completely covering the sides of said core thereof; (v) wherein said winding encircles said core at a position between said core and said first segment housing such that said winding is not exterior to said first segment housing; (b) a second sensor segment including: (i) said second sensor segment separable from said first sensor segment, said second sensor segment including a second magnetically permeable core comprising another sector of said torus; (ii) said second sensor segment being joinable to said first sensor segment to restrain said first and said second cores in substantially toroidal arrangement; (iii) a second segment housing substantially enclosing said second magnetically permeable core including completely covering the sides of said core thereof.