The present invention is directed to an electrical wiring device that includes a frameless shutter assembly disposed in the front cover portion or in a separator member between the receptacle openings and the receptacle terminals. The frameless shutter assembly comprises a first shutter member and a second shutter member configured to move from a closed position to an open position when the hot and neutral blades of a plug blade set are simultaneously inserted into the receptacle openings to engage a set of receptacle terminals and remain closed otherwise. The front cover member and/or the at least one separator includes a first stop member disposed proximate the first shutter member and a second stop member being disposed proximate the second shutter member.