A drawer type circuit breaker comprises a drawer base and a circuit breaker body, wherein the circuit breaker body is rocked into and out of the drawer base, so that a main circuit of the circuit breaker body and the drawer base is switched on and switched off; a safety baffle is provided between the drawer base and the circuit breaker body to block a drawer base busbar or a bridge type contact of the drawer base; and a front-rear displacement device for the safety baffle to move toward a movement direction of the drawer base is provided on the safety baffle and the drawer base. According to the drawer type circuit breaker of the present invention, the front-rear displacement device is provided on the safety baffle and the drawer base, the safety baffle is displaceable front and back, and the drawer base busbar may penetrate out of the safety baffle. The bridge contact can be mounted either on the drawer base or on the body, such that the mounting position of the bridge type contact is more flexible, and the connection of the main circuit is more stable and reliable.

A system and method are provided for coordinating the installation and removal a motor control center subunit with the power connection and interruption thereof. A system of interlocks and indicators causes an operator to install a motor control center subunit into a motor control center, and connect supply and control power thereto, in a particular order. Embodiments of the invention may prevent actuation of line contacts of the bucket, and shield the line contacts, until the bucket is fully installed in the motor control center. Other embodiments also prevent circuit breaker closure until the line contacts are engaged with a bus of the motor control center.

A switchgear housing for housing an object, such as a circuit breaker, includes: a wall with an access opening for access to a high voltage connector; at least one shutter plate movable parallel to the wall between a closed position, in which the shutter plate covers the opening and an open position, in which the shutter plate exposes the opening; an urging means for urging the at least one shutter plate towards the closed position; an operating mechanism for operating the shutter plate from the closed position to the open position when an object is moved into the housing; and at least one latch movable in a direction perpendicular to the wall with the access opening and between a latched position and an unlatched position. A path of the at least one latch and a path of the shutter plate intersect.

A switchgear housing for housing an object, such as a circuit breaker, includes: a wall with an access opening for access to a high voltage connector; at least one shutter plate movable parallel to the wall between a closed position, in which the shutter plate covers the opening and an open position, in which the shutter plate exposes the opening; an urging means for urging the at least one shutter plate towards the closed position; an operating mechanism for operating the shutter plate from the closed position to the open position when an object is moved into the housing; and at least one latch movable in a direction perpendicular to the wall with the access opening and between a latched position and an unlatched position. A path of the at least one latch and a path of the shutter plate intersect.

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 system and method are provided for coordinating the installation and removal a motor control center subunit with the power connection and interruption thereof. A system of interlocks and indicators causes an operator to install a motor control center subunit into a motor control center, and connect supply and control power thereto, in a particular order. Embodiments of the invention may prevent actuation of line contacts of the bucket, and shield the line contacts, until the bucket is fully installed in the motor control center. Other embodiments also prevent circuit breaker closure until the line contacts are engaged with a bus of the motor control center.

A switchgear housing for housing an object, such as a circuit breaker, includes: a wall with an access opening for access to a high voltage connector; at least one shutter plate movable parallel to the wall between a closed position, in which the shutter plate covers the opening and an open position, in which the shutter plate exposes the opening; an urging means for urging the at least one shutter plate towards the closed position; an operating mechanism for operating the shutter plate from the closed position to the open position when an object is moved into the housing; and at least one latch movable in a direction perpendicular to the wall with the access opening and between a latched position and an unlatched position. A path of the at least one latch and a path of the shutter plate intersect.

A switchgear housing for housing an object, such as a circuit breaker, includes: a wall with an access opening for access to a high voltage connector; at least one shutter plate movable parallel to the wall between a closed position, in which the shutter plate covers the opening and an open position, in which the shutter plate exposes the opening; an urging means for urging the at least one shutter plate towards the closed position; an operating mechanism for operating the shutter plate from the closed position to the open position when an object is moved into the housing; and at least one latch movable in a direction perpendicular to the wall with the access opening and between a latched position and an unlatched position. A path of the at least one latch and a path of the shutter plate intersect.

An interlock system includes a number of lock assemblies and a number of keys. Each key is associated with at least one lock assembly. The number of lock assemblies includes a number of actuator lock assemblies and a number of multi-purpose lock assemblies. The number of keys includes a number of actuator keys and a number of multi-purpose keys. At least one lock assembly is operatively coupled to a reliable indicator.