Abstract: The present invention relates to switching wide band electric transmission signals. It provides a switching matrix which includes inlet/outlets one of which sets forms the columns while the other set forms the rows of the matrix and switching points disposed at the intersections of the conductors. The wiring of the matrix includes plane supports equal in number to that of its rows and of its columns, each row conductor or column conductor being wired on a distinct support, the supports being assembled in two stacks disposed perpendicularly to each other, one stack being constituted by the wiring supports of the column conductors while the other is constituted by the wiring supports of the row conductors. The figure shows a set of two stacks 204, 205, of four supports in individual screen boxes which form a switching matrix with four rows and four columns. Such a matrix is used advantageously for switching telecommunication signals.