A trip mechanism for a LV or MV switching device, operatively coupled with a first operating element of said switching device, which is reversibly movable between a first actuation position and a second actuation position, and with second operating element of said switching device, which is reversibly movable between a third actuation position and a fourth actuation position, said trip mechanism further comprising: - a supporting frame; - a first trip lever, which is operatively connected to said supporting frame and is capable to rotate with respect to said supporting frame between a first engage position and a first trip position, said first operating element moving said first trip lever from said first engage position to said first trip position, when said first operating element moves from said first actuation position to said second actuation position; - a second trip lever, which is operatively connected to said supporting frame and is capable to rotate with respect to said supporting frame between a second engage position and a second trip position, said second trip lever being blocked by said first trip lever in said second engage position when said first trip lever is in said first engage position, said second trip lever moving from said second engage position to said second trip position when said first trip lever moves from said first engage position to said first trip position; - a third trip lever, which is operatively connected to said supporting frame and is capable to rotate with respect to said supporting frame between a third engage position and a third trip position, said third trip lever being blocked by said second trip lever in said third engage position when said second trip lever is in said second engage position, said third trip lever moving from said third engage position to said third trip position when said second trip lever moves from said second engage position to said second trip position; characterised by - a trip pin, which is operatively connected to said supporting frame and is capable to translate with respect to said supporting frame between a fourth engage position and a fourth trip position, said trip pin being operatively engageable with said third trip lever, so that said trip pin is blocked by said third trip lever in said fourth engage position when said third trip lever is in said third engage position, said trip pin moving from said fourth engage position to said fourth trip position when said third trip lever moves from said third engage position to said third trip position, said trip pin moving said second operating element from said third actuation position to said fourth actuation position, when said trip pin moves from said fourth engage position to said fourth trip position. - a supporting frame; - a first trip lever, which is operatively connected to said supporting frame and is capable to rotate with respect to said supporting frame between a first engage position and a first trip position, said first operating element moving said first trip lever from said first engage position to said first trip position, when said first operating element moves from said first actuation position to said second actuation position; - a second trip lever, which is operatively connected to said supporting frame and is capable to rotate with respect to said supporting frame between a second engage position and a second trip position, said second trip lever being blocked by said first trip lever in said second engage position when said first trip lever is in said first engage position, said second trip lever moving from said second engage position to said second trip position when said first trip lever moves from said first engage position to said first trip position; - a third trip lever, which is operatively connected to said supporting frame and is capable to rotate with respect to said supporting frame between a third engage position and a third trip position, said third trip lever being blocked by said second trip lever in said third engage position when said second trip lever is in said second engage position, said third trip lever moving from said third engage position to said third trip position when said second trip lever moves from said second engage position to said second trip position; - a trip pin, which is operatively connected to said supporting frame and is capable to translate with respect to said supporting frame between a fourth engage position and a fourth trip position, said trip pin being operatively engageable with said third trip lever, so that said trip pin is blocked by said third trip lever in said fourth engage position when said third trip lever is in said third engage position, said trip pin moving from said fourth engage position to said fourth trip position when said third trip lever moves from said third engage position to said third trip position, said trip pin moving said second operating element from said third actuation position to said fourth actuation position, when said trip pin moves from said fourth engage position to said fourth trip position.