A D/C trip assembly structured to detect a D/C trip condition in an A/C circuit breaker, wherein said circuit breaker includes a housing assembly, a trip unit assembly, and a conductor assembly, said conductor assembly including a number of load conductors, said trip unit assembly including a trip bar, said D/C trip assembly comprising: an electro-magnet coupled to a load bus; a mounting assembly including a body, said mounting assembly body including a pivotal coupling; said mounting assembly body structured to be coupled to said circuit breaker housing assembly and to position said mounting assembly body pivotal coupling adjacent said electro-magnet; an armature assembly including a body and a trip bar linkage, said trip bar linkage extending from said armature assembly body, characterised by: said armature assembly body being generally planar and comprising an elongated rectangular portion and a coupling portion; wherein said armature assembly body elongated rectangular portion is a magnetic body; wherein said armature assembly body elongated magnetic rectangular portion is disposed adjacent the electro-magnet; said armature assembly body being pivotally coupled to said mounting assembly body pivotal coupling; said armature assembly body structured to move between a first position, wherein said armature assembly body is close to said electro-magnet, and a second position, wherein said armature assembly body is spaced from said electro-magnet; wherein, said trip bar linkage structured to move between a first position and a second position, said trip bar linkage positions corresponding to said armature assembly body positions; and said trip bar linkage structured to be coupled to said trip bar. an electro-magnet coupled to a load bus; a mounting assembly including a body, said mounting assembly body including a pivotal coupling; said mounting assembly body structured to be coupled to said circuit breaker housing assembly and to position said mounting assembly body pivotal coupling adjacent said electro-magnet; an armature assembly including a body and a trip bar linkage, said trip bar linkage extending from said armature assembly body, characterised by: said armature assembly body being generally planar and comprising an elongated rectangular portion and a coupling portion; wherein said armature assembly body elongated rectangular portion is a magnetic body; wherein said armature assembly body elongated magnetic rectangular portion is disposed adjacent the electro-magnet; said armature assembly body being pivotally coupled to said mounting assembly body pivotal coupling; said armature assembly body structured to move between a first position, wherein said armature assembly body is close to said electro-magnet, and a second position, wherein said armature assembly body is spaced from said electro-magnet; wherein, said trip bar linkage structured to move between a first position and a second position, said trip bar linkage positions corresponding to said armature assembly body positions; and said trip bar linkage structured to be coupled to said trip bar. said armature assembly body being generally planar and comprising an elongated rectangular portion and a coupling portion; wherein said armature assembly body elongated rectangular portion is a magnetic body; wherein said armature assembly body elongated magnetic rectangular portion is disposed adjacent the electro-magnet; said armature assembly body being pivotally coupled to said mounting assembly body pivotal coupling; said armature assembly body structured to move between a first position, wherein said armature assembly body is close to said electro-magnet, and a second position, wherein said armature assembly body is spaced from said electro-magnet; wherein, said trip bar linkage structured to move between a first position and a second position, said trip bar linkage positions corresponding to said armature assembly body positions; and said trip bar linkage structured to be coupled to said trip bar.