Patent ID: 7009132

Claim:
A circuit breaker constructed for connection to an external conductor, the circuit breaker comprising: a housing having an internal cavity and an external terminal recess separated by a wall having at least a first vent opening; separable contacts in the internal cavity including a fixed contact and a movable contact; a main conductor extending from the fixed contact in the internal cavity through the wall into the external terminal recess; an arc chute in the internal cavity between the separable contacts and the wall in which an arc generated during opening of the separable contacts is extinguished with the generation of arc gases; a terminal assembly seated in the external terminal recess and comprising: a terminal collar into which the main conductor extends; an electrically conductive stand received in the terminal collar and seated on the main conductor, the electrically conductive stand having a transverse through opening aligned with the first vent opening in the wall through which the arc gases escape the housing; a terminal screw threaded through the terminal collar to clamp the external conductor against the electrically conductive stand to electrically connect the external conductor with the main conductor; wherein the electrically conductive stand has a tapped bore in a bottom face below the through opening aligned with a through bore in the main conductor and the terminal collar has a base wall with a through hole aligned with the through bore, and wherein the terminal assembly further includes a retainer screw extending through the through hole and the through bore and engaging the threaded bore in the electrically conductive stand to mechanically secure the terminal collar and the electrically conductive stand to the main conductor; and wherein the transverse through opening in the electrically conductive stand is lined with an electrically insulative material.