Circuit breaker with pivoting control buttons

A circuit breaker comprising a box containing a triggering and resetting mechanism acting on separable contacts for opening and closing at least one electric current path, the box comprising a front wall fitted with passage openings for an ON button and an OFF button, said ON button and OFF button being accessible to an operator from outside of the box and cooperating with a control piece of said mechanism inside the box, each button being mounted in the box so as to be movable between an outward operational position and an inward operational position with respect to the box and having a single pressing side for the operator's finger, each of said buttons being pivotably mounted in said box about a rotating axis by means of two curved arms which extend opposite from a low-displacement end portion of the pressing side, each of said curved arms comprising two opposite faces respectively sliding on a pivot gudgeon coaxial to said rotating axis and on a fixed bearing element, each of said buttons comprising a control arm which extends opposite a high-displacement end portion of the pressing side and which is couple to said mechanism, the curved arms and the gudgeon being arranged so as to create between said inward and outward operational positions, a significant shift in front projection of said high-displacement end portion.