Main topic of this thesis is constructional and economic analysis of the existing housing for instrument transformers, with special emphasis on housing behavior during seismic loads. The thesis also suggests development of a new, optimized housing based on obtained data. Instrument transformer is a static device which, due to its specific (slim) design, is subjected to high dynamic loads during earthquakes. These loads cause significant stresses in transformer's housing and insulator. Goal of this thesis is to get a clear picture of whether or not the existing housing can be optimized (there is a possibility that there is no room for optimization) and on that basis provide guidelines for further procedures in finding better solutions that will contribute to a better and ultimately more robust transformer behavior at seismic loads. So far no optimization of housing has been done for several reasons. One of the main reasons is that there were no tools to check the stress dependence on housing design, primarily the thickness of the sheet. With the arrival of modern engineering tools such as ANSYS, engineers have a powerful tool that can do simulations without spending significant resources and time on experimental testing of different designs. Depending on the geographic area, there are different seismically classified areas. From this perspective, goal of this paper is to provide guidelines for further optimization of the entire production range of housings with the ultimate aim of obtaining a manufacturing range of housings suitable for the earthquake area in which transformer is located. The transformer model was simplified and ANSYS software tool was used for static and modal analysis. Based on these results, spectral analysis was performed according to IEEE 693-2018 standard requirements. The results fulfill all requirements of IEEE 693-2018 standard. Conclusion is that there is room for housing optimization. Following from that, optimization of sheet thickness was carried out with the software tool using the response surface method. A set of experiments with different combinations of sheet thickness were created and the four best sheet thickness combinations were chosen. The combination with the smallest mass was selected and additional static, modal and spectral analysis of this solution was performed to confirm the selection. The results satisfied required conditions and selected combination of sheets significantly reduces the housing's mass while keeping the stresses on the housing and on the transformer insulator within the permitted limits. Further housing optimization work is proposed. The direction for the creation of a product family with housings divided into standard groups is also proposed. During product design, the housing that meets the seismic requirements of a particular market would be chosen.