1. A trip bar cam unit for a trip bar, said trip bar for a circuit breaker, said trip bar including an elongated body, said trip bar body including a first axial surface, defining a number of cam surfaces and an axis of rotation, said trip bar body first axial surface defining a keyed bore, said trip bar body structured to rotate between a number of positions including a first position and a second position, said circuit breaker including a housing assembly, a conductor assembly, a trip assembly, and an operating mechanism, said housing assembly defining an enclosed space, said conductor assembly substantially disposed within said housing assembly enclosed space, said conductor assembly including a movable contact bus assembly, a number of pairs of separable contacts, and a fixed contact bus assembly, each pair of separable contacts including a fixed contact and a movable contact, wherein each said movable contact moves between a first position, wherein said movable contact is spaced from, and not in electrical communication with, an associated fixed contact, and a second position, wherein said movable contact is coupled to, and in electrical communication with, an associated fixed contact, said trip assembly including said trip bar, a Ground Fault (GF) solenoid, and an over-current detection assembly, said GF solenoid including a plunger structured to move between an extended, first position and a retracted, second position, said GF solenoid plunger including an engagement end, said over-current detection assembly operatively coupled to said trip bar, said operating mechanism operatively coupled to each said pair of contacts and structured to move each said pair of contacts between said first and second positions, said trip bar operatively coupled to said operating mechanism and structured to cause said operating mechanism to move each said pair of contacts from said second position to said first position, said trip bar cam unit comprising:a trip bar cam unit body defining an axis of rotation, said trip bar cam unit body including a cam lever and a keyed protrusion;
said cam lever extending generally radially from said trip bar cam unit body;
said keyed protrusion corresponding to said trip bar keyed bore;
said cam lever includes an engagement surface; and
said trip bar cam unit body is structured to be coupled to said trip bar so that said cam lever engagement surface is disposed an effective distance from said GF solenoid plunger engagement end when said trip bar is in said second position.