1. In a crosspoint matrix of the type having a plurality of electromagnetic relays arranged in rows and columns, each relay including an electromagnetic coil and a permanent magnet, wherein the improvement comprises: a cover sheet in magnetic proximity to said plurality of relays for selectively shunting the magnetic fields of the permanent magnets by partially covering some of the magnets and completely covering the rest of the magnets within said matrix thereby eliminating variations in magnetic forces upon the contacts within said relays.

4. A crosspoint matrix of the type having a plurality of electromagnetic relays arranged in rows and columns, each relay containing an electromagnet and a permanent magnet, wherein the improvement comprises a common cover sheet placed on the permanent magnets parallel with the plane of the magnetization axes of said permanent magnets, said cover sheet entirely covering all the permanent magnets belonging to the interior rows and columns of said matrix, said cover sheet covering one-half of each permanent magnet belonging to the outer rows and columns of said matrix, the permanent magnets at the corners of said matrix being uncovered, whereby the fields corresponding to said permanent magnets belonging to the interior rows and columns of said matrix are shunted to a greater extent than the fields of said permanent magnets belonging to the outer rows and columns of said matrix, and the fields of said permanent magnets belonging to the outer rows and columns of said matrix are shunted to a greater extent than the permanent magnets corresponding to the corners of said matrix.