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- The electromagnetic properties and thermal behavior of Mn-Zn ferrite cores used for the blocking filter in the Power Line Communication(PLC) application were investigated as the function of additives. The highest density and permeability of 4.98 g/cm3 and 8,221 respectively were obtained to the specimen with composition of MnO 24 mol%, ZnO 25 mol% and Fe2O3 51 mol% added MoO3 400 ppm, SiO2 100 ppm and CaO 200 ppm since the uniform grains were organized and the microstructures were compacted through reduction of pores. The permeability was increased up to 13,904 as temperature of specimen increased to 110 , however, it was decreased precipitously under 100 over 110 . The exothermic behavior was observed in the frequency range from 1 kHz to 1 MHz that the maximum temperature of specimens became 102 at 1 MHz. In the consequence, the Mn-Zn ferrite core developed by this research will maintain the stable electromagnetic properties since the temperature of ferrite core rose to 93 in the range of 10 kHz to 450 kHz bandwidth qualified for PLC.