In the thesis was made analysis of assembly congestions on the assembly line for the production of NV / NH fuses. In detail are presented fuses, which are made on the assembly line in the company. The structure of the product for individual fuses and the structure of assembly, servicing and control operations is constructed. In the second part of the thesis, the assembly system is analyzed and presented. With congestion analysis, critical locations are displayed throughout the whole fuse assembly process, where most congestion occurs. Subsequently, proposals for reducing of congestions are elaborated and presented.