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 electrical connection enclosure comprises at least one electricity source connected to an associated electrical load and comprising a base, a frontal portion, a cover and functional elements attached to the base. All the electricity sources have a base of constant height and a frontal portion and a cover whose heights are adapted to the dimensions of the functional elements. The electrical enclosure comprises at least one external connection module (706) associated to one of the electricity sources and selected from a set of external connection modules. Each external connection module comprises a first end (709) of height equal to the height of the bases and comprising input connectors (710) connected to the electricity source, and a second end (711) of height equal to one, two or three times the height of the bases and less than or equal to the height of the associated electricity sources and comprising output connectors (712) connected to the electrical load.

An electrical adapter is disclosed for connecting a connection contact of a circuit breaker with an associated contact piece of an electrical circuit along which the circuit breaker has to be inserted, including a hollow tubular element having a first end portion and a second end portion configured to be electrically connected to a connection contact and a contact piece, respectively, an inner cavity of the hollow tubular element having, at the first end portion, a first frusto-conical shape. A first connector having a hollow deformable body and configured to be accommodated inside the first end portion. A locking body configured to be securely placed along the inner cavity of the hollow tubular element. A second connector including a first connection portion configured to be accommodated inside the first end portion of the hollow tubular element.

An electrical adapter is disclosed for connecting a connection contact of a circuit breaker with an associated contact piece of an electrical circuit along which the circuit breaker has to be inserted, including a hollow tubular element having a first end portion and a second end portion configured to be electrically connected to a connection contact and a contact piece, respectively, an inner cavity of the hollow tubular element having, at the first end portion, a first frusto-conical shape. A first connector having a hollow deformable body and configured to be accommodated inside the first end portion. A locking body configured to be securely placed along the inner cavity of the hollow tubular element. A second connector including a first connection portion configured to be accommodated inside the first end portion of the hollow tubular element.

A draw out circuit breaker has a reduced partial discharge in insulation surrounding a primary stab bus. A circular disk plate on one end of the bus includes tapped inserts located at a radial separation distance from the bus. An insulator sleeve surrounding the bus is formed to encapsulate the tapped inserts. Raised embosses on the circular disk plate separate the end portion of the insulator sleeve by a gap distance from the inward facing surface of the disk plate. The increased gap distance reduces formation of a triple point region between the surface of the disk plate and the insulator sleeve, thereby reducing occurrence of partial discharges in the insulator sleeve near the gap.

A draw out circuit breaker has a reduced partial discharge in insulation surrounding a primary stab bus. A circular disk plate on one end of the bus includes tapped inserts located at a radial separation distance from the bus. An insulator sleeve surrounding the bus is formed to encapsulate the tapped inserts. Raised embosses on the circular disk plate separate the end portion of the insulator sleeve by a gap distance from the inward facing surface of the disk plate. The increased gap distance reduces formation of a triple point region between the surface of the disk plate and the insulator sleeve, thereby reducing occurrence of partial discharges in the insulator sleeve near the gap.

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.

A connector assembly is provided for facilitating live connection of equipment in a switchgear. The assembly includes two circular plates, and conductive fingers which are arranged and spaced apart around the two plates to form a finger cluster with first open-end on a first cluster end and second open-end on an opposite second cluster end. Each open-end can receive a conductor therein. Each finger can include a first finger end and an opposite second finger end which form respective first and second cluster ends; two first interior grooves which are spaced-apart on an interior surface to receive a portion of respective plates; and first and second exterior grooves on an exterior surface around the first and second finger ends respectively. The assembly also includes first and second garter springs which are arranged around the fingers in respective first and second exterior grooves to apply a force against the fingers.

The present invention relates to a contact finger alignment arrangement (100) to facilitate electrical connections in a switchgear cubicle (102), said contact finger alignment arrangement (100) comprising a first contact finger (104-1) and a second contact finger (104-2) extending parallel to a longitudinal axis (106), each of said contact fingers (104-1,104-2) having a front end (108) defining a contact receiving portion to facilitate longitudinal insertion of a contact arm (114) fixed to said cubicle (102), a coupling portion (118) for mechanically coupling the first contact finger (104-1) and the second contact finger (104-2), and a rear end (112). The rear end (112) of each of said contact fingers (104-1,104-2) is provided with a conical hole (120) converging towards said longitudinal axis (106) for receiving an alignment pin (122) projected through the conical hole (120) of said first contact finger (104-1) to the second contact finger (104-2) such that the resilient rotational motion of the contact fingers (104-1,104-2) is executed in a restricted manner.

The present invention relates to a contact finger alignment arrangement (100) to facilitate electrical connections in a switchgear cubicle (102), said contact finger alignment arrangement (100) comprising a first contact finger (104-1) and a second contact finger (104-2) extending parallel to a longitudinal axis (106), each of said contact fingers (104-1,104-2) having a front end (108) defining a contact receiving portion to facilitate longitudinal insertion of a contact arm (114) fixed to said cubicle (102), a coupling portion (118) for mechanically coupling the first contact finger (104-1) and the second contact finger (104-2), and a rear end (112). The rear end (112) of each of said contact fingers (104-1,104-2) is provided with a conical hole (120) converging towards said longitudinal axis (106) for receiving an alignment pin (122) projected through the conical hole (120) of said first contact finger (104-1) to the second contact finger (104-2) such that the resilient rotational motion of the contact fingers (104-1,104-2) is executed in a restricted manner.