The thesis project was carried out in collaboration with the company Swepart and aimed to develop a concept for an engageable and disengageable clutch that would be mounted onto an engine driven power take off. A power take-off is the link that connects a vehicle's engine with machines that are to be driven, and since these power take-offs are often connected even when the machines do not need to be used, there are unnecessary losses in the form of increased fuel consumption. To eliminate these losses, the thesis investigated the possibility of integrating a clutch in the engine driven power take-off. To get an estimate of how much the clutch had to cost for it to be profitable, a study was made of what it costs for a typical truck to have a power take-off connected. During the project, a modified variant of Ulrich, Eppinger and Yang's product development method was used to develop a complete concept for the clutch. The modified method included five steps that were used to first identify the requirements that the clutch needed to meet, examine which clutch variants were best suited for the project work, develop concepts that could be compared and finally refined to arrive at a final concept. The final concept was presented in the form of a CAD model and consisted of a total of 18 components that had a height and width of 160 mm and a length of approximately 250 mm. The estimate of what it costs for a truck to have a power take-off connected turned out to be between 11,500 and 13,500 SEK per year.The final concept for the engageable and disengageable clutch was a combination of a single-plate clutch and a spline clutch that provides a smooth start-up, has a high-power transmission capacity, generates a small amount of heat, and is activated through pneumatic pressure. For the concept to be improved and manufactured for real, there are several future works that must be carried out. Among other things, material selection must be made for the various components of the clutch. FEM analysis must be done to see how the concept can handle high torques and temperatures. A cost analysis should also be carried out to see if the clutch becomes profitable to manufacture.