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The MCA8 software application is described and applied to model task in this paper. This software application was developed for the purpose of the support of multi-criteria decision-making in the field of electrical power engineering. The MCA8 runs on Windows with .NET framework 2.0 and it is user-friendly. The MCA8 offers six methods of multi-criteria analysis (MCA) for solving multi-criteria decision-making tasks. These methods are WSA, IPA, TOPSIS, AGREPREF, CDA and PROMETHEE. We can use them for example for selecting the most suitable old devices in electrical networks, which we need to replace by new devices (Reclosers in this paper). The application of these remote-controlled devices causes acceleration in handling and thus shortening of duration of a fault in the network. This results in rising of probability of faultless service and thus the reliability of electrical energy supply.