We are offering a solution for the high-aspect-ratio problem relevant to the numericalsimulation of AC loss in superconductors and metals with high aspect (width-to-thickness)ratio. This is particularly relevant to simulation of fault current limiters (FCLs) based onsecond generation YBCO tapes on RABiTS. By assuming a linear scaling of the electricand thermal properties with the size of the structure, we can replace the realsample with an effective sample of a reduced aspect ratio by introducing sizemultipliers into the equations that govern the physics of the system. The simulation isperformed using both a proprietary equivalent circuit software and a commercial FEMsoftware. The correctness of the procedure is verified by simulating temperatureand current distributions for samples with all three dimensions varying within10−3–103 of the original size. Qualitatively the distributions for the original and scaled samples areindistinguishable, whereas quantitative differences in the worst case do not exceed 10%.