In this article, simulations were realized for different power rectifiers used for testing DC fuses. Using the OrCAD PSpice software, a single-phase uncontrolled bridge rectifier and a single-phase controlled bridge rectifier are simulated for different loads. From the data analysis, some important conclusions were realized regarding the form of the temperature waveforms in transient conditions and quasisteady state thermal conditions.V tem članku so bile izvedene simulacije za različne usmernike moči, ki se uporabljajo za preskušanje enosmernih varovalk. S programsko opremo OrCAD PSpice se simulirajo enofazni nenadzorovani mostni usmernik in enofazni mostični usmernik za različne obremenitve. Iz analize podatkov je bilo ugotovljenih nekaj pomembnih zaključkov glede oblike temperaturnih valov v prehodnih pogojih
