A passive arc control system for a motor control center 60 includes an arc attenuating box having sides separating adjacent vertical bus bar phases 54, providing a physical barrier to arc flash energy. The box is open at its top and bottom forming a chimney 55. A shutter assembly for each box includes an insulator cap 62 on a free end of the bus bar and an independently moveable, box-shaped shutter 64 that slides along the bus bar away from the insulator cap, when a device is connected to the bus bar. The shutter has an opening 65 through which the bus bar passes when the device is connected to the bus bar and an opening 55′ aligned with the box's chimney. The arc control system provides a high degree of arc protection for personnel working around open motor control centers and is highly modular and easy to construct.

An adapter for contacting a circuit breaker to a busbar system, with a casing having a first mounting side to attach and electrically contact the adapter to at least one busbar of a busbar system and a second mounting side to attach and electrically contact a circuit breaker to the casing, characterized in that, on the second mounting side, at least one rotary disk with several sets of threaded inserts for attaching a circuit breaker is fitted so that it can pivot around a rotational axis perpendicular to the mounting sides, wherein each set of threaded inserts is equipped for mounting a particular type of circuit breaker so that for each position of the rotary disk one of the sets of threaded inserts is positioned in a mounting position for a particular type of circuit breaker.

An adapter for contacting a circuit breaker to a busbar system, with a casing having a first mounting side to attach and electrically contact the adapter to at least one busbar of a busbar system and a second mounting side to attach and electrically contact a circuit breaker to the casing, characterized in that, on the second mounting side, at least one rotary disk with several sets of threaded inserts for attaching a circuit breaker is fitted so that it can pivot around a rotational axis perpendicular to the mounting sides, wherein each set of threaded inserts is equipped for mounting a particular type of circuit breaker so that for each position of the rotary disk one of the sets of threaded inserts is positioned in a mounting position for a particular type of circuit breaker.

A switch gear module for installation in a switch gear cabinet includes: a switch gear module housing, the housing including power circuits and first electrical power devices including breakers, contactors, and motor circuit breakers for supplying electric power to an electric load including an electric motor, and electric control circuits and auxiliary circuits controlling the first electrical power devices. The power circuits and the first electrical power devices are contained in a first power-unit housing forming a first functional power-unit and the electric control circuits and auxiliary circuits are contained in a separate second control- and auxiliary circuit housing forming a second functional control- and auxiliary circuit unit. Each of the first functional power-unit and the second functional control and auxiliary circuit unit includes an interface for connecting the power circuits and electrical power devices contained in the first power-unit housing.

A switch gear module for installation in a switch gear cabinet includes: a switch gear module housing, the housing including power circuits and first electrical power devices including breakers, contactors, and motor circuit breakers for supplying electric power to an electric load including an electric motor, and electric control circuits and auxiliary circuits controlling the first electrical power devices. The power circuits and the first electrical power devices are contained in a first power-unit housing forming a first functional power-unit and the electric control circuits and auxiliary circuits are contained in a separate second control- and auxiliary circuit housing forming a second functional control- and auxiliary circuit unit. Each of the first functional power-unit and the second functional control and auxiliary circuit unit includes an interface for connecting the power circuits and electrical power devices contained in the first power-unit housing.

A busbar applied in electrical cabinet disclosing an electrical cabinet set containing main busbars and secondary busbars built in a closed tubular shape, assembled in the referred electrical cabinet, which also presents insulators and secondary insulators, protection system in the main busbar systems, extension set and finally derivation connectors.

A motor control center (MCC) unit includes a drawer having a space for accommodating a circuit breaker, a hinge bracket installed on one of left and right sides of the drawer, a base connected to the hinge bracket by a hinge shaft, and a display mechanism installation plate fastened to the base by a fastening member. Although a display mechanism or a display mechanism installation plates are different according to sizes or models of the MCC unit, a base and a hinge bracket may be commonly used.

A motor control center (MCC) unit includes a drawer having a space for accommodating a circuit breaker, a hinge bracket installed on one of left and right sides of the drawer, a base connected to the hinge bracket by a hinge shaft, and a display mechanism installation plate fastened to the base by a fastening member. Although a display mechanism or a display mechanism installation plates are different according to sizes or models of the MCC unit, a base and a hinge bracket may be commonly used.

An elongated busbar board (1) for connection of devices (11) to a power busbar system comprises a front side touch protection cover plate (2) consisting of touch protection cover plate segments (2-i) made of an electrically insulating material and having feedthrough openings (7) for electrical connection contacts (13A) of devices (11) to be connected to the elongated busbar board. The touch protection cover plate is adapted to cover power busbars (6) made of an electrically conductive material having contact openings (5) lying directly beneath the feedthrough openings and comprises a touch protection base plate (3) connected to the touch protection cover plate and consisting of touch protection base plate segments (3-i) made of the electrically insulating material and adapted to cover the power busbars enclosed by the elongated busbar board from behind, wherein a thermal expansion difference caused by different thermal expansion coefficients of the electrically insulating material and of the electrically conductive material is compensated.

A compact auxiliary connector can include two bushings each with an electrical connector(s), and a tubing connected between the two bushings to insulate an electrical cable, which is connected between electrical connectors of the two bushings. The electrical connector of each of the two bushings can be connected to an electrical device, a line or load bus or a combination thereof, according to the desired connection configuration. Each bushing may also include a flexible joint cover, such as a boot, to cover the connection of the bushing connectors to a bus, such as a primary bus. The compact auxiliary connector can manage live connections between auxiliary or other device(s) and line/load buses in a switchgear cabinet of a switchgear assembly. The bushings, tubing and flexible joint cover can be formed of insulating materials having desired dielectric strength according to the voltage applications.