A mobile contact (20) is provided for an electric current switching device (50), comprising: a first conductor blade (1) and a second conductor blade (2), extending in planes (P1, P2) parallel to each other and distant from each other, the conductor blades (1, 2) being linked in rotation about a common rotational axis (R), a first and a second spacer (3, 4) configured to maintain a minimum distance between the first blade (1) and the second blade (2), in which a cross section (S1, S2) of each blade (1, 2) is shaped so as to: have an area equal to the area of a reference cross section (S1, S2) of rectangular shape and of the same length (a), and have a quadratic moment greater than the quadratic moment of the reference cross section (S1, S2), the quadratic moment being determined in relation to an axis parallel to the transverse axis (T1, T2) of the blades (1, 2).