Motor control center unit disconnect with interlocks

A motor control center unit, comprising:

• a housing configured to be inserted into a motor control center, the housing including an outer structure comprising side walls, a bottom plate, a back wall, and a front door hinged to one of the side walls and configured to open a front side of the housing to provide access to an interior space, an exterior face of the back wall of the housing being configured to be located adjacent to an electrical power bus when the housing has been inserted into the motor control center;
• a pivoted platform mounted on a pivot fastened to an interior face of the back wall of the housing, the platform supporting a circuit breaker on a front side of the platform and supporting stabs on a back side of the platform, the stabs being electrically connected to a circuit breaker electrical switch actuated by a circuit breaker switch handle of the circuit breaker, the stabs configured to project through an opening in the back wall of the housing, to mechanically and electrically engage the power bus for electrical connection therewith, when the platform is pushed in a backward direction on the pivot against the back wall;
• an advance/retract handle accessible on the front side of the housing, connected to an advance/retract mechanism configured to push the pivoted platform to connect the stabs to the power bus or pull the pivoted platform to disconnect the stabs from the power bus;
• a connect/disconnect mechanism located within the housing, comprising a cam, an actuating arm, and a bail with a pin:
• the cam of the connect/disconnect mechanism, being rotatably mounted on a cam shaft mounted on the pivoted platform in the housing, having a cam surface in a slot opening on a periphery of the cam;
• the actuating arm of the connect/disconnect mechanism, being coupled between a unit on/off handle located on the front side of the housing and the cam, the actuating arm configured to rotate the cam in response to actuation of the unit on/off handle, and to cause the cam to rotate as the cam shaft follows a pivoting motion of the pivoted platform relative to a position of the actuating arm;
• and
• the bail of the connect/disconnect mechanism, being pivotally mounted on the pivoting platform and connected to the switch handle of the circuit breaker, the bail having the pin projecting therefrom, the cam surface in the slot of the cam being configured to engage the pin of the bail in a first position when the pivoted platform is forced backward by the advance/retract mechanism, to connect the stabs to the power bus, thereby operatively connecting the unit on/off handle to the switch handle of the circuit breaker;
• and
• the cam surface in the slot of the cam being further configured to disengage the pin of the bail in a second position when the pivoted platform is forced forward to disconnect the stabs from the bus, thereby operatively disconnecting the unit on/off handle from the switch handle of the circuit breaker.