A method of assembling a draw-out breaker assembly including a circuit breaker having a plurality of contacts, said method comprising: coupling an interlocking system to a front panel of a base assembly, wherein coupling the interlocking system comprises: coupling an access door to the front panel such that the access door selectively covers an opening formed in the front panel; coupling an access door stopper to the front panel and to the access door, wherein the access door stopper is selectively moveable between a rest position, a trip position and an open position; and coupling a racking screw to the front panel and to the plurality of contacts; coupling a trip assembly to the front panel and to the access door stopper, wherein the trip assembly is selectively moveable between a rest position, a trip position and an open position, such that, when (i) the access door stopper is in the trip position, (ii) the trip assembly is moved from the rest position to the trip position by the access door stopper to engage a trip bar of the circuit breaker, and (iii) the access door is partially opened such that access to the racking screw through the opening is prevented, a mechanical trip signal is provided to the circuit breaker to position the plurality of contacts in the open position, and such that, when (i) the access door stopper is moved to the open position, (ii) the trip assembly is moved to the open position by the access door stopper, and (iii) the access door is fully opened to enable access to the racking screw, the open position of the plurality of contacts is confirmed. coupling an interlocking system to a front panel of a base assembly, wherein coupling the interlocking system comprises: coupling an access door to the front panel such that the access door selectively covers an opening formed in the front panel; coupling an access door stopper to the front panel and to the access door, wherein the access door stopper is selectively moveable between a rest position, a trip position and an open position; and coupling a racking screw to the front panel and to the plurality of contacts; coupling an access door to the front panel such that the access door selectively covers an opening formed in the front panel; coupling an access door stopper to the front panel and to the access door, wherein the access door stopper is selectively moveable between a rest position, a trip position and an open position; and coupling a racking screw to the front panel and to the plurality of contacts; coupling a trip assembly to the front panel and to the access door stopper, wherein the trip assembly is selectively moveable between a rest position, a trip position and an open position, such that, when (i) the access door stopper is in the trip position, (ii) the trip assembly is moved from the rest position to the trip position by the access door stopper to engage a trip bar of the circuit breaker, and (iii) the access door is partially opened such that access to the racking screw through the opening is prevented, a mechanical trip signal is provided to the circuit breaker to position the plurality of contacts in the open position, and such that, when (i) the access door stopper is moved to the open position, (ii) the trip assembly is moved to the open position by the access door stopper, and (iii) the access door is fully opened to enable access to the racking screw, the open position of the plurality of contacts is confirmed.