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Abstract: Four-Switch mode Three-Phase (FSTP) inverter is considered as a general inverter development to diminish the worth, disarray, perspective and incidents during its trading. The standard FSTP inverter usually achieves simply buck DC-AC type change and most important voltage of the FSTP coordinated inverter is same as V/2√3. Consequently, the outcome side line voltage can't go past this rate. To chip away at the VUF( voltage utilization component) and reliability of the customary FSTP inverter, the FSTP SEPIC inverter is seen as in this assessment work, in which both the buck and lift DC-AC change is achieved. The twofold principal Sliding-Mode Control (SMC) is utilized to improve its components and moreover it is utilized to certify whether strength of the whole system at various working conditions is upto the end. Limit plan, part runs, and the working of the FSTP-SEPIC based inverter are similarly publicized. The MATLAB Simulink model is used to support force utilization of Fuel Cell (FC) by the FSTP-SEPIC inverter. Reenactment result shows the capability of the inverter , both the buck and lift movement with FC input. The inverter efficiency and various aftereffects of buck and lift inverter action with FC input is shown using Simulation.