Arc fault circuit breaker

A method of assembling a circuit breaker, comprising:

• connecting electrically a first plurality of components disposed within a first compartment of a first housing, said first plurality of components including a first interconnecting component;
• assembling a second housing to said first housing to enclose said first compartment, said second housing defining a second compartment;
• extending said first interconnecting component through a first opening of said second housing into said second compartment;
• connecting electrically a second plurality of components disposed within said second compartment;
• interconnecting electrically said first interconnecting component to said second plurality of components disposed within said second compartment;
• assembling a third housing to said second housing to enclose said second compartment, said third housing defining a third compartment;
• disposing a third plurality of components within said third compartment;
• interconnecting electrically through a second opening of said third housing a second interconnecting component of said third plurality of components to one component of said third plurality of components disposed within said third compartment;
• connecting electrically a fourth plurality of components disposed within a fourth compartment, said fourth compartment defined by a fourth housing;
• assembling said fourth housing to said third housing to enclose said third compartment;
• extending one end of said second interconnecting component of said third plurality of components through a third opening of said fourth housing into said fourth compartment;
• aligning said one end of said second interconnecting component with a terminal of said fourth plurality of components disposed within said fourth compartment;
• and
• securing mechanical and electrical engagement between said terminal and said one end of said second interconnecting component from outside of said fourth housing.