A latch for a seat of a motor vehicle, comprising a closing assembly adapted to cooperate with a latch striker; said closing assembly comprising: - a ratchet which can assume an opening position, in which said ratchet enables engagement and disengagement between said latch striker and an opening of said ratchet, and a closing position, in which said ratchet holds said latch striker within said opening; said ratchet comprising a first and a second tooth (22, 23) bounding said opening on respective opposite sides of said opening; - a pawl movable about an axis between a decoupled position in which said pawl permits the movement of said ratchet from said closing position to said opening position, and a coupled position, in which said pawl is coupled with said ratchet for keeping said ratchet in said closing position and preventing disengagement of said striker from said opening; and - a lever which can be moved between: a first position, in which said lever is coupled with said ratchet to block said ratchet in said closing position, so as to limit over-travel movement of said ratchet away from the pawl, when said ratchet is set in the closing position; and a second position in which said lever is decoupled from said ratchet, so as to allow said ratchet to over-travel in said closing position; characterized in that said lever and said pawl cooperate with a same second tooth of said ratchet, when said ratchet is arranged in said closing position; said second tooth comprising: - a first surface, which laterally bounds said opening and cooperates with said pawl when said ratchet is arranged, in use, in said closing position; and - a slot which is engaged by said lever, when said lever is arranged in said first position and said ratchet is arranged, in use, in said closing position; said slot being arranged downstream of said surface proceeding according to the advancing rotation direction of said ratchet from said opening position to said closing position; said slot being defined by a second surface of said second tooth. - a ratchet which can assume an opening position, in which said ratchet enables engagement and disengagement between said latch striker and an opening of said ratchet, and a closing position, in which said ratchet holds said latch striker within said opening; said ratchet comprising a first and a second tooth (22, 23) bounding said opening on respective opposite sides of said opening; - a pawl movable about an axis between a decoupled position in which said pawl permits the movement of said ratchet from said closing position to said opening position, and a coupled position, in which said pawl is coupled with said ratchet for keeping said ratchet in said closing position and preventing disengagement of said striker from said opening; and - a lever which can be moved between: a first position, in which said lever is coupled with said ratchet to block said ratchet in said closing position, so as to limit over-travel movement of said ratchet away from the pawl, when said ratchet is set in the closing position; and a second position in which said lever is decoupled from said ratchet, so as to allow said ratchet to over-travel in said closing position; characterized in that said lever and said pawl cooperate with a same second tooth of said ratchet, when said ratchet is arranged in said closing position; said second tooth comprising: - a first surface, which laterally bounds said opening and cooperates with said pawl when said ratchet is arranged, in use, in said closing position; and - a slot which is engaged by said lever, when said lever is arranged in said first position and said ratchet is arranged, in use, in said closing position; said slot being arranged downstream of said surface proceeding according to the advancing rotation direction of said ratchet from said opening position to said closing position; said slot being defined by a second surface of said second tooth. a first position, in which said lever is coupled with said ratchet to block said ratchet in said closing position, so as to limit over-travel movement of said ratchet away from the pawl, when said ratchet is set in the closing position; and a second position in which said lever is decoupled from said ratchet, so as to allow said ratchet to over-travel in said closing position; characterized in that said lever and said pawl cooperate with a same second tooth of said ratchet, when said ratchet is arranged in said closing position; said second tooth comprising: - a first surface, which laterally bounds said opening and cooperates with said pawl when said ratchet is arranged, in use, in said closing position; and - a slot which is engaged by said lever, when said lever is arranged in said first position and said ratchet is arranged, in use, in said closing position; said slot being arranged downstream of said surface proceeding according to the advancing rotation direction of said ratchet from said opening position to said closing position; said slot being defined by a second surface of said second tooth. - a first surface, which laterally bounds said opening and cooperates with said pawl when said ratchet is arranged, in use, in said closing position; and - a slot which is engaged by said lever, when said lever is arranged in said first position and said ratchet is arranged, in use, in said closing position;