Neverending increase in electricity consumption requires appropriate upgrades in power system which results in new powerplants and more interconnections within the grid. This leads to increased fault currents which are sometimes well above current rating of already installed switchgear and other electrical equipment. In the course of this master's thesis one of the proposed solutions to this calamity is discussed. More specifically, saturable iron core fault current limiters are reviewed. In order to better understand the basic principles of its operation a number of simulations are carried out on simple grids which represent potential installation point for fault current limiters. All the simulations were carried out using EMTP-RV software which is able to perform the required transients calculations.These calculations represent the result of complex interaction between a number of different system elements (motors, circuit breakers, transformer, etc.). Besides results of the simualtions this master's thesis presents some of the basic equations and theory that should be kept in mind during analysis of this type of fault current limiter. All of the simulation results are followed by appropriate observations and commentary which points out to the most evident benefits or shortcomings of this technology. Regradless of its flaws (size, weight and cost), saturable iron core fault current limiter is one of the representatives of fault current limiters whose reliability and simplicity of construction set it apart from other proposed designs. Nevertheless, mentioned shortcomings leave much to be deisred and, as such, further research is required in order to improve its design concepts and operational features.