A simple application to calculate an initial symmetrical 3-phase short-circuit current. The application allows you to configure any single line of electrical circuit. The source can be a transformer or a point of the power system. The circuit may consist of any number of transformers and lines. The end of the circuit should be completed by a load or a motor. Motor participates in the short-circuit current at the point of fault. The application allows you to save files of created diagrams. The application is designed for electrical engineering students and electricians to perform simplified calculations.