To increase the energy efficiency of a Ruths accumulator and to enable Power-to-Heat in industrial steam processes, the Competence Unit „Sustainable Thermal Energy Systems“ of the Austrian Institute of Technology GmbH (AIT) has developed a hybrid storage concept . Therefore, a conventional Ruths accumulator is surrounded by latent heat storage, which can be electrically heated. The central task of this thesis was to plan a test stand for the industrial usage of the hybrid storage unit. For this purpose, a P&I-Diagram was created, the necessary components were defined, the Ruths accumulator was engineered and the coating with the latent heat storage was designed. In addition, a simple model of the hybrid storage was simulated and discussed to simplify the interpretation of the experimental results of the test stand. For the future planning of hybrid storage units the upscaling effects of the test results were also discussed. Apart from the planning of the test stand, various aspects of the latent heat storage unit and its interaction with the Ruths storage were analysed. First, several methods to improve the heat transport in the latent heat storage unit were researched. Cold compression of a mixture of graphite particles and PCM powder according to Acem et. al.  and the sandwich concept according to Steinmann und Tamme  were the most promising methods to use in the hybrid storage. The thermal behaviour of a latent heat storage according to the sandwich concept was investigated. Based on simulations of different variations of the sandwich concept, an approximation function was created that can predict the the needed time for phase change of such latent heat storage units. Furthermore, the overall heat transfer coefficient between the Ruths accumulator and the latent heat storage unit was analysed. According to the operation mode of the Ruths accumulator, the minimal overall heat transfer coefficient between water and PCM ranges from 20 W/m/K (unloading) to 530 W/m/K (loading) for the steam phase and from 160 W/m/K (unloading) to 180 W/m/K (loading) in the liquid phase.