Electrical switching apparatus and adjustable trip assembly therefor

An adjustable trip assembly for an electrical switching apparatus, said electrical switching apparatus including a housing, separable contacts and an operating mechanism for opening and closing said separable contacts, said adjustable trip assembly comprising:

• a load conductor;
• a magnetic assembly comprising a magnetic member and an armature movably coupled to said magnetic member;
• and
• a calibration assembly comprising a calibration bracket cooperating with said armature, and an adjustment mechanism being adjustable to move said calibration bracket and thereby adjust the position of said armature with respect to said magnetic member to calibrate said magnetic assembly,
• wherein said adjustment mechanism is a magnetic calibration screw comprising an enlarged head portion and a threaded body portion;
• wherein said magnetic member includes a threaded aperture;
• and wherein said threaded body portion of said magnetic calibration screw is adjustably secured within the threaded aperture, and
• wherein said calibration bracket is a non-ferrous member including a first end, a second end, and an intermediate portion extending between the first end and the second end;
• wherein the first end engages said armature;
• and wherein the second end cooperates with the enlarged head portion of said calibration screw.