The present invention is directed to a shutter assembly that includes a base tandem member and an inner tandem member disposed within the base tandem member between retainer walls. The inner tandem member is configured to move within the base tandem member from a shutter closed position to a shutter open position when a base tandem key member and an inner tandem key member are simultaneously engaged by a hot plug blade and a neutral plug blade of a plug blade set. An aligning retainer assembly is coupled between the base tandem member and the inner tandem member and is configured to substantially limit both the latitudinal movement and the longitudinal movement of the inner tandem member within the base tandem member such that the inner tandem member is substantially prevented from being skewed when moving between the shutter closed position and the shutter open position.