Motor control centers have units or buckets with one or more sliding shutters that controllably block access to a stab isolation port based on position of the operator disconnect handle using attached cams that slide the shutter right and left. A front panel of the unit or bucket may also be configured to pivot out about a long axis associated with a bottom long side thereof.

Motor control centers have units or buckets with one or more sliding shutters that controllably block access to a stab isolation port based on position of the operator disconnect handle using attached cams that slide the shutter right and left. A front panel of the unit or bucket may also be configured to pivot out about a long axis associated with a bottom long side thereof.

A power connector (100) is provided for connecting a drawout circuit breaker to a conductive bus bar. The power connector (100) is formed as a unitary body having a first end and a second end opposite the first end. The first end has a circuit breaker terminal (310) to connect to the drawout circuit breaker through the clusters. The second end has a bus bar terminal (350) to connect to the conductive bus bar. The bus bar terminal (350) may have a pair of extending arms (352), which form a U-shape profile. A conductive bus bar can be connected between the pair of extending arms (352) on one or both sides to the bus bar terminal (350).

A power connector (100) is provided for connecting a drawout circuit breaker to a conductive bus bar. The power connector (100) is formed as a unitary body having a first end and a second end opposite the first end. The first end has a circuit breaker terminal (310) to connect to the drawout circuit breaker through the clusters. The second end has a bus bar terminal (350) to connect to the conductive bus bar. The bus bar terminal (350) may have a pair of extending arms (352), which form a U-shape profile. A conductive bus bar can be connected between the pair of extending arms (352) on one or both sides to the bus bar terminal (350).

A door locking device of a distribution board of an air circuit breaker, including a transmission shaft transmitting power for drawing in and out a circuit breaker body, a shaft link rotatably coupled to one end of the transmission shaft, a link rod having one end rotatably coupled to a portion of the shaft link, a cam plate rotatably coupled to the other end of the link rod and pushing or pulling the circuit breaker boy, and a constraint plate installed in a distribution board door, further includes a pressing part protruding from a portion of the link road, and a hook plate rotatably coupled to a side of the cradle and having one end in contact with the pressing part to receive rotational force and the other end restricting or releasing the constraint plate, wherein the hook plate releases the constraint plate in a disconnection position.

An arrangement includes a switch including a plurality of connectable modules. A first module is a connection module, electrical connections running into an interior, starting from the connection module for connection purposes. A second module is a manual plug module, connectable via its second contacts to the connection module, electrical connections passing external to the switch starting from the manual plug module for connection purposes. A third module is a communication module including a communication electronics system and including second contacts and first contacts, the communication module being connectable via its second contacts to the connection module and the manual plug module being connectable via its second contacts to the communication module. Second contacts of the communication module are electrically connectable to first contacts of the communication module or to the communication electronics system. The communication module is a communication adapter and the communication electronics system is connectable thereto.

An arrangement includes a switch including a plurality of connectable modules. A first module is a connection module, electrical connections running into an interior, starting from the connection module for connection purposes. A second module is a manual plug module, connectable via its second contacts to the connection module, electrical connections passing external to the switch starting from the manual plug module for connection purposes. A third module is a communication module including a communication electronics system and including second contacts and first contacts, the communication module being connectable via its second contacts to the connection module and the manual plug module being connectable via its second contacts to the communication module. Second contacts of the communication module are electrically connectable to first contacts of the communication module or to the communication electronics system. The communication module is a communication adapter and the communication electronics system is connectable thereto.

A closed door operation racking device is provided for racking a circuit breaker to and from a power bus from outside of a housing of a motor control center unit. The racking device includes a racking operator assembly and a push-button interlock assembly. The racking operator is configured to rack-in the electrical device and connect the stabs to a power bus in a connected position and to rack-out the electrical device and disconnect the stabs from the power bus in a disconnected position. The push-button interlock assembly prevents the operation of the racking operator under certain conditions, and includes a spring-loaded locker assembly and a spring-loaded push-button operator assembly. A push-button operator of the push-button operator assembly is depressed to disengage the locker assembly from the racking operator to allow operation of the racking operator.

A motor control unit (MCU) and methods of operating the same are provided. The MCU includes a housing enclosing a retractable stab assembly (RSA) having stabs attached thereto. The MCU further includes a bracket assembly having a mount for securing the bracket assembly to the RSA, guiderails for slideably engaging the RSA to facilitate the extending and retracting motion, and a lead screw accessible via an opening in the front of the housing. Rotating the lead screw causes the RSA to extend and retract which engages and disengages the stabs. The MCU also includes a motor assembly having a drive motor coupled to a drive shaft. The motor rotates the shaft in response to control signals from a remote-device. The motor assembly attaches to the housing such that the rotation of the shaft in response to the signals rotates the lead screw to engage and disengage the stabs.

A motor control unit (MCU) and methods of operating the same are provided. The MCU includes a housing enclosing a retractable stab assembly (RSA) having stabs attached thereto. The MCU further includes a bracket assembly having a mount for securing the bracket assembly to the RSA, guiderails for slideably engaging the RSA to facilitate the extending and retracting motion, and a lead screw accessible via an opening in the front of the housing. Rotating the lead screw causes the RSA to extend and retract which engages and disengages the stabs. The MCU also includes a motor assembly having a drive motor coupled to a drive shaft. The motor rotates the shaft in response to control signals from a remote-device. The motor assembly attaches to the housing such that the rotation of the shaft in response to the signals rotates the lead screw to engage and disengage the stabs.