Electrical switching apparatus, and trip unit and interface assembly therefor

A trip unit for an electrical switching apparatus, said electrical switching apparatus comprising a housing having an interior and an exterior, separable contacts disposed in the interior, and an operating mechanism for opening and closing said separable contacts, said trip unit comprising:

• an enclosure;
• a controller enclosed by the enclosure;
• a cover member coupled to the enclosure, said cover member including a plurality of indicia;
• and
• an interface assembly comprising:
• at least one adjustment knob assembly comprising a post member and a ring member, said ring member including a cutout, said post member including a first end cooperating with said controller and a second end disposed opposite and distal from the first end, said ring member being disposed on the second end,
• wherein said at least one adjustment knob assembly pivots among a plurality of positions to correspondingly adjust said controller,
• wherein each of said positions corresponds to a predetermined setting of said trip unit,
• wherein said ring member substantially overlays all but one of said plurality of indicia, and
• wherein said cutout exposes said one of said plurality of indicia, thereby indicating said position of said at least one adjustment knob assembly and the corresponding predetermined setting of said trip unit.

An electrical switching apparatus comprising:

• a housing having an interior and an exterior;
• separable contacts disposed in the interior;
• an operating mechanism for opening and closing said separable contacts;
• and
• a trip unit comprising:
• an enclosure,
• a controller enclosed by the enclosure,
• a cover member coupled to the enclosure, said cover member including a plurality of indicia, and
• an interface assembly comprising:
• at least one adjustment knob assembly comprising a post member and a ring member, said ring member including a cutout, said post member including a first end cooperating with said controller and a second end disposed opposite and distal from the first end, said ring member being disposed on the second end,
• wherein said at least one adjustment knob assembly pivots among a plurality of positions to correspondingly adjust said controller,
• wherein each of said positions corresponds to a predetermined setting of said trip unit,
• wherein said ring member substantially overlays all but one of said plurality of indicia, and
• wherein said cutout exposes said one of said plurality of indicia, thereby indicating said position of said at least one adjustment knob assembly and the corresponding predetermined setting of said trip unit.