Multiple circuit breaker with double break rotary contact

A breaking device for a low voltage molded case multipole circuit breaker, comprising a rotary switching cross bar guided in rotation around a first transverse fixed axis by means of bearings arranged in the case, said first axis being perpendicular to the longitudinal direction of each pole, which comprises:

• a pair of stationary contacts connected to corresponding connection terminals;
• a notch being arranged in the cross bar for supporting a double-break rotary contact comprising a two-arm contact lever extending along said longitudinal direction, said rotary contact having opposing contact pieces cooperating with the stationary contacts in the closed position;
• and
• a pair of springs located within said notch and anchored between the rotary contact and the cross-bar;
• wherein the rotary contact is elastically positioned in the notch with a first degree of freedom in translation enabling the rotary contact to be moved in a vertical direction for generating a balanced contact pressure on the two corresponding stationary contacts, and with a second degree of freedom in translation along said longitudinal direction to provide an equilibrium longitudinal position of the rotary contact by a self-centering effect of said springs, said first and second degrees of freedom extending at right angles.