A hinge assembly includes first and second portions. One of the first and second portions includes first and second receptacles and the other one of the first and second portions includes first and second cylindrical members extending in opposite directions along a hinge axis and a thickened portion having a contoured outer surface disposed adjacent the cylindrical members. The second portion is moveable from: a first state wherein the first and second cylindrical members are disposed in the first and second receptacles such that the second portion is coupled to the first portion and generally free to rotate about the hinge axis through at least a predetermined degree range, and a second state in which the second portion is decoupled from the first portion responsive to the second portion being rotated beyond the predetermined degree range and the contoured outer surface interacting with a portion of the first portion.

A trip cam is for an operating handle assembly of an electrical switching apparatus. The electrical switching apparatus includes a housing and a number of poles. The operating handle assembly has an operating handle partially extending into the housing. The trip cam includes a mounting portion structured to be disposed in the housing, and an operating handle protrusion extending from the mounting portion and being structured to engage the operating handle.

A hinge assembly includes first and second portions. One of the first and second portions includes first and second receptacles and the other one of the first and second portions includes first and second cylindrical members extending in opposite directions along a hinge axis and a thickened portion having a contoured outer surface disposed adjacent the cylindrical members. The second portion is moveable from: a first state wherein the first and second cylindrical members are disposed in the first and second receptacles such that the second portion is coupled to the first portion and generally free to rotate about the hinge axis through at least a predetermined degree range, and a second state in which the second portion is decoupled from the first portion responsive to the second portion being rotated beyond the predetermined degree range and the contoured outer surface interacting with a portion of the first portion.

A hinge assembly includes a first portion having first and second receptacles and a second portion having first and second cylindrical members extending in opposite directions along a hinge axis and a thickened portion having a contoured outer surface disposed adjacent the cylindrical members. The second portion is moveable from: a first state wherein the first and second cylindrical members are disposed in the first and second receptacles such that the second portion is coupled to the first portion and generally free to rotate about the hinge axis through at least a predetermined degree range, and a second state in which the second portion is decoupled from the first portion responsive to the second portion being rotated beyond the predetermined degree range and the contoured outer surface interacting with a portion of the first portion.

Methods, apparatus, and systems are provided for a selectivity device for a circuit breaker. The invention includes a modular assembly adapted to be coupled to a load conductor assembly. The modular assembly includes a tripping plunger including a cam surface adapted to interact with a breaker tripping mechanism; an armature coupled to the tripping plunger; a yoke adapted to generate a magnetic field in response to an electric current in the load conductor assembly and disposed to apply a magnetic force proportionate to the electric current on the armature; and a spring assembly adapted to counter-balance the magnetic force up to a predefined tripping current in the load conductor assembly. Numerous additional aspects are disclosed.

A trip cam is for an operating handle assembly of an electrical switching apparatus. The electrical switching apparatus includes a housing and a number of poles. The operating handle assembly has an operating handle partially extending into the housing. The trip cam includes a mounting portion structured to be disposed in the housing, and an operating handle protrusion extending from the mounting portion and being structured to engage the operating handle.

A trip cam is for an operating handle assembly of an electrical switching apparatus. The electrical switching apparatus includes a housing and a number of poles. The operating handle assembly includes an operating handle partially extending into the housing and a cradle member cooperating with the operating handle. The trip cam includes: a mounting portion structured to be disposed in the housing, the mounting portion including a first region, a second region disposed generally opposite the first region, and a third region disposed generally between the first region and the second region; a transfer leg extending from the first region and being structured to cooperate with each of the number of poles; a driving leg extending from the third region and being structured to be driven by the cradle member; and an operating handle protrusion extending from the second region and being structured to engage the operating handle.