Circuit interrupter with improved trip bar assembly accomodating internal space constraints

A circuit interrupter comprising:

• a housing;
• separable main contacts within said housing;
• an operating mechanism within said housing and interconnected with said separable main contacts;
• and
• a trip mechanism within said housing and including a rotatable trip bar assembly that, when rotated, generates a tripping operation causing said operating mechanism to open said separable main contacts, said rotatable trip bar assembly including an attaching structure having a cavity into which an accessory trip member is inserted, said accessory trip member causing said rotatable trip bar assembly to rotate and generate said tripping operation when said accessory trip member is moved in a first direction, said accessory trip member including a lower portion and an upper portion positioned partially adjacent to said lower portion, said upper portion extending a greater distance away from said attaching structure than said lower portion, said lower portion including a protrusion that inserts through an opening in said upper portion, said cavity including a recess into which said protrusion then inserts when said accessory trip member is inserted into said cavity.