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Increased penetration of non-linear loads like power electronic converterbased systems have aggravated issue of harmonic injection in the power system.Neutral current harmonics is an issue of concern for three phase four wiresystem. This paper is focused on the elimination of neutral current harmonicswith the help of shunt active power filter based on star-delta transformmer andsingle phase half bridge inverter. The presented active power filter eliminatesharmonics present in neutral current which in turn helps in mitigating thirdharmonics from the supply mains. The topology has advantage of reduced numberof semiconducting devices and switching losses as compared to conventionalthree phase active filter. Simulation studies for the proposed active filter ispresented and compared with behavior of conventional three phase active filter.Experimental results for DSP based laboratory prototype of the proposed filterare shown to substantiate performance of system. Both simulation as well asexperimental results demonstrate effective compensation provided by singlephase half bridge inverter based active filter.