Protective device with tamper resistant shutters

An electrical wiring device comprising:

• a housing assembly including a cover assembly, a rear body member, a plurality of line terminals and a plurality of load terminals, the cover assembly including at least one set of receptacle openings including a hot plug blade opening and a neutral plug blade opening having a vertical opening portion and a horizontal opening portion, the at least one set of receptacle openings configured to receive a corded plug blade set;
• an electrical circuit assembly disposed within the housing assembly and coupled to the plurality of line terminals and the plurality of load terminals, the electrical circuit assembly including at least one set of receptacle contacts in operative alignment with the at least one set of receptacle openings;
• and
• at least one shutter mechanism configured to be disposed within an interior portion of the cover assembly and disposed between the at least one set of receptacle openings and the at least one set of receptacle contacts, the at least one shutter mechanism including,
• a first shutter member including a first blade engagement structure,
• a second shutter member including a second blade engagement structure, the second shutter member being slidably disposed within the first shutter member,
• a third shutter member having a third blade engagement structure, the third shutter member being slidably disposed within the first shutter member and coupled to the first shutter and the second shutter, the third shutter member including a locked state and an unlocked state, the third shutter being configured to be driven to the unlocked state and open only when the first shutter member and the second shutter member move relative to each other in response to the first blade engagement structure and the second blade engagement structure being substantially simultaneously engaged by a set of plug blades.

A modular shutter assembly for use within various types of electrical wiring devices having differing amperage ratings, each of the electrical wiring devices including a housing assembly, the housing assembly further including a cover assembly and a rear body member, the cover assembly including at least one set of receptacle openings configured to receive a corded plug blade set having a hot plug blade and a neutral plug blade, the modular shutter assembly comprising:

• a first shutter member including a first blade engagement structure, the first shutter member being configured to be disposed within an interior portion of the cover assembly and disposed between the at least one set of receptacle openings and the at least one set of receptacle contacts;
• a second shutter member including a second blade engagement structure, the second shutter member being slidably disposed within the first shutter member;
• an interface formed in either the first shutter member or the second shutter member or both, the interface being configured to connect a third shutter member to the modular shutter assembly, the interface being configured to drive the third shutter into an open position only when the first shutter member and the second shutter member move relative to each other in response to the first blade engagement structure and the second blade engagement structure being substantially simultaneously engaged by a set of plug blades, the interface not interfering with the operation of the first shutter member and the second shutter member when the modular shutter assembly is used without the third shutter member.