Circuit breaker with mechanical interlock

A circuit breaker, comprising:

• a contact mechanism for establishing electrical contact with an electrical circuit, comprising a first contact member and a second contact member being movable in relation to the first contact member;
• an actuator mechanism comprising an armature mechanically coupled to the second contact member, the armature being selectively positionable between a closed position in which the armature urges the second contact member into electrical contact with the first contact member thereby permitting energization of the electrical circuit, and an open position in which the armature urges the second contact member away from the first contact member thereby inhibiting energization of the electrical circuit;
• and
• a mechanical interlock comprising a blocking pin selectively positionable between a first position proximate the armature and a second position distal the armature, wherein the blocking pin interrupts movement of the armature from the open to the closed positions when the blocking pin is in the first position.

A circuit breaker, comprising:

• a frame member movable between a connect position, a test position, and a disconnect position;
• a contact mechanism fixedly coupled to the frame member for establishing electrical contact with an electrical circuit, comprising a first contact member and a second contact member movable in relation to the first contact member;
• an actuator mechanism fixedly coupled to the frame member, comprising an armature mechanically coupled to the second contact member and urging the second contact member into electrical contact with the first contact member on a selective basis;
• a racking mechanism comprising a channel member and a lead screw rotatably coupled to the channel member and the frame member and having a first, a second, and a third through hole formed therein, the frame member being movable between the connect, test, and disconnect positions in response to rotation of the lead screw;
• and
• a mechanical interlock coupled to the frame member and comprising a blocking pin and a pivot arm pivotally coupled to the blocking pin and moving the blocking pin between a first position in which at least a portion of the blocking pin is located within one of the first, second, and third through holes, and a second position, wherein the blocking pin substantially aligns with the first, second, and third through holes when the frame member is located respectively in the connect, test, and disconnect positions, and the blocking pin interferes with movement of the armature when the blocking pin is located in the second position thereby preventing the armature from urging the second contact member into electrical contact with the first contact member.