Various embodiments may include an insulator arrangement for a switchgear assembly comprising: an axially symmetrical insulating structure element; a first conductive annular structure arranged on an inner surface of the structure element; and a second conductive annular structure arranged on an outer surface of the structure element. The first annular structure and the second annular structure are insulated from one another by the insulating structure element.

A power breaking pole including a vacuum interrupter including two ends called a lower end and an upper end, respectively, which vacuum interrupter is held between two uprights, which are arranged symmetrically with respect to a main plane P of the vacuum interrupter, the vacuum interrupter being held in a centred manner between the two uprights solely by two connectors called a lower connector and an upper connector, respectively.

A vacuum interrupter arrangement may be used in a tap changer. The vacuum interrupter arrangement has a vacuum interrupter; a metal shield configured to shield against external magnetic fields, the metal shield having a hollow cylindrical design and being arranged around at least a part of a cylindrical outer surface of the vacuum interrupter; and a holder, which is arranged on the outside of the metal shield and the vacuum interrupter, and which surrounds the metal shield and the vacuum interrupter at least partially coaxially. The holder has a plurality of holding elements which hold the metal shield in position relative to the vacuum interrupter.

A vacuum circuit breaker 10 comprising a vacuum interrupter 12 coupled between upper 18 and lower 20 terminals and being operable to make or break an electrical connection between the upper and lower terminals. The circuit breaker has a body 22 formed from electrically insulating material, the vacuum interrupter being located in an internal chamber of the body. The lower terminal 20 comprises a hollow body 26 that forms part of the internal chamber and which is shaped and dimensioned to allow the vacuum interrupter 12 to pass through it. An electrical connector device 50 has a movable part 52 that is connected to the movable contact and an annular fixed part 54 that is connected to the lower terminal 20. The movable part 52 is connected to the first part 54 by flexible connectors 56, and has a socket (58) for engaging an electrical connector 60 of the vacuum interrupter 12. A pulling rod 16 is coupled to the movable contact via the electrical connector 60.

A vacuum circuit breaker comprising a vacuum interrupter (12) coupled between upper (18) and lower (20) terminals and being operable to make or break an electrical connection between the upper and lower terminals. The circuit breaker has a body 22 formed from electrically insulating material, the vacuum interrupter being located in an internal chamber of the body. The circuit breaker body is arranged to provide an isosceles triangle between the upper (C) and lower (A) terminal connection interfaces. This allows the same design of both upper and lower external connectors 80, 82. A pulling rod (16) coupled to the vacuum interrupter comprises a core (70) of heat-resistant plastic co-moulded with a shell (72) formed from impact resistant plastic.

A vacuum interrupter according to the present invention includes: a vacuum container formed by two insulation containers each having an opening at one end thereof, the openings being opposed to each other; a pair of electrodes provided inside the vacuum container; and an arc shield having a contamination preventing portion surrounding the electrodes, and projections projecting in a direction along an outer circumferential surface of the contamination preventing portion, the arc shield being positioned by the projections being engaged with the openings.

A vacuum interrupter includes: a ceramic body; and at least one tubelike inner shielding, which is located around an area of a fixed contact and a movable contact. The ceramic body is vacuum tightly closed at both ends with metal caps. The ceramic body is provided at its inner surface with a diameter reducing integrated collar. The shielding is provided with complementary outer bulges or convexities in its structure, adapted to the integrated collar such that the shielding lies against one side of the integrated collar, and is fixed in that position at an opposed side of the collar with a ring formed countering element.

A ceramic insulator for vacuum interrupters extends along a longitudinal extent and forms a cavity in said longitudinal extent. The cavity has a first opening on a first end of the longitudinal extent and a second opening on a second end of the longitudinal extent. The openings are designed so that they can be sealed in a gas-tight manner using appropriate connections. The sealed first opening is designed to guide at least one fixed contact into the cavity, and the sealed second opening is designed to guide at least one moving contact into the cavity. The ceramic insulator has, on an inner face of the cavity, one or multiple electrically conductive discharge path interrupters extending perpendicularly to the longitudinal extent of the ceramic insulator.

Various embodiments may include an insulator arrangement for a switchgear assembly comprising: an axially symmetrical insulating structure element; a first conductive annular structure arranged on an inner surface of the structure element; and a second conductive annular structure arranged on an outer surface of the structure element. The first annular structure and the second annular structure are insulated from one another by the insulating structure element.

A power breaking pole including a vacuum interrupter including two ends called a lower end and an upper end, respectively, which vacuum interrupter is held between two uprights, which are arranged symmetrically with respect to a main plane P of the vacuum interrupter, the vacuum interrupter being held in a centred manner between the two uprights solely by two connectors called a lower connector and an upper connector, respectively.