A retractor restraint system (1, 1') for securing wheelchairs and/or people in vehicles, including: - a housing, - a retractor reel mounted to the housing rotatably in a positive and a negative direction of rotation for receiving a belt which can be coupled to a wheelchair, wherein the belt can be wound on by a rotation of the reel in the positive direction of rotation and can be unwound by a rotation of the reel in the negative direction of rotation, - an arresting unit for arresting the reel to prevent rotation in the negative direction of rotation in an operating state of the retractor restraint system (1, 1'), - a clamping unit arranged at the housing for releasably clamping fast the belt unwound from the reel, and - a triggering mechanism for actuation of the clamping unit, wherein the triggering mechanism can be coupled to the arresting unit and the reel in such a way that the clamping unit is actuated when a torque acts on the reel in the negative direction of rotation and the reel is arrested by the arresting unit, and wherein the triggering mechanism is a mechanically actuable triggering mechanism which is moveable from an operative position into a triggering position to actuate or release the clamping unit respectively characterised by a spring unit for resiliently coupling the reel to the arresting unit so that the reel in the arrested state is rotatable in a predefined region in the negative direction of rotation, wherein preferably the triggering mechanism is coupled with play to the reel in such a way that the triggering mechanism is moved relative to the reel from the operative position into the triggering position when the reel rotates in the arrested state in a predefined region in the negative direction of rotation. - a housing, - a retractor reel mounted to the housing rotatably in a positive and a negative direction of rotation for receiving a belt which can be coupled to a wheelchair, wherein the belt can be wound on by a rotation of the reel in the positive direction of rotation and can be unwound by a rotation of the reel in the negative direction of rotation, - an arresting unit for arresting the reel to prevent rotation in the negative direction of rotation in an operating state of the retractor restraint system (1, 1'), - a clamping unit arranged at the housing for releasably clamping fast the belt unwound from the reel, and - a triggering mechanism for actuation of the clamping unit, wherein the triggering mechanism can be coupled to the arresting unit and the reel in such a way that the clamping unit is actuated when a torque acts on the reel in the negative direction of rotation and the reel is arrested by the arresting unit, and wherein the triggering mechanism is a mechanically actuable triggering mechanism which is moveable from an operative position into a triggering position to actuate or release the clamping unit respectively characterised by a spring unit for resiliently coupling the reel to the arresting unit so that the reel in the arrested state is rotatable in a predefined region in the negative direction of rotation, wherein preferably the triggering mechanism is coupled with play to the reel in such a way that the triggering mechanism is moved relative to the reel from the operative position into the triggering position when the reel rotates in the arrested state in a predefined region in the negative direction of rotation. wherein the triggering mechanism can be coupled to the arresting unit and the reel in such a way that the clamping unit is actuated when a torque acts on the reel in the negative direction of rotation and the reel is arrested by the arresting unit, and wherein the triggering mechanism is a mechanically actuable triggering mechanism which is moveable from an operative position into a triggering position to actuate or release the clamping unit respectively characterised by a spring unit for resiliently coupling the reel to the arresting unit so that the reel in the arrested state is rotatable in a predefined region in the negative direction of rotation, wherein preferably the triggering mechanism is coupled with play to the reel in such a way that the triggering mechanism is moved relative to the reel from the operative position into the triggering position when the reel rotates in the arrested state in a predefined region in the negative direction of rotation.