A pole assembly of a switching device is provided. The pole assembly includes a first interrupter unit operably connected to a pole plate of the pole assembly via first post insulators. The first interrupter provides a path for current flow through the first interrupter in a closed state and interrupts the current flow in an open state. A second interrupter unit is operably connected to the first interrupter unit and to the pole plate via second post insulators. The second interrupter allows the current flow through the first interrupter unit in an open state and grounds the switching device in a closed state. The pole assembly includes a dielectric shield physically disposable between and operably connected to the first post insulators and the second post insulators for uniformly distributing an electric field generated during operation of the pole assembly.

A make contact system for high-voltage applications includes a vacuum switching tube having two switch contacts in the form of plate contacts, of which at least one is a moving contact coupled to a drive. At least one plate contact is rotationally symmetrically surrounded by a shielding element, and the shielding element has an electric conductivity which is less than 40×10.sup.−6 S/m.

A switching apparatus includes one or more electric pole units, each electric pole unit comprising a fixed contact, a movable contact, a first pole terminal, a second pole terminal, and a motion transmission arrangement to reversibly move the movable contact. The motion transmission arrangement includes a conductive motion transmission member coupled to the movable contact. The first pole terminal is in electrical connection to the fixed contact while the second pole terminal includes a first coupling region in electrical connection with a second coupling region of the conductive motion transmission member. Each electric pole unit further includes a shielding element formed by a conductive hollow body and arranged in a relative fixed position with respect to the second pole terminal and the motion transmission member. The shielding element is arranged to at least partially surround the first coupling and the second coupling region.

A vacuum interrupter including a cylindrical insulator, a first end cap sealed to one end of the insulator and a second end cap sealed to an opposite end of the insulator to provide a vacuum chamber. The vacuum interrupter further includes a fixed contact stem extending through the first end cap and having a contact positioned within the chamber, and a movable contact stem extending through the second end cap and having a contact portion positioned within the chamber. A first vapor shield is formed around the fixed contact stem so as to define a gap between the fixed contact and the insulator and a second vapor shield is formed around the movable contact so as to define a gap between the movable contact and the insulator.

A network service and transformer safety protector on a secondary side of a network transformer tank system. The network service and transformer safety protector is positioned between the network transformer and a secondary network distribution system and is configured to connect and disconnect a transformer from the secondary network. The network service and transformer safety protector is attached to the outside of the transformer tank.

A vacuum circuit breaker includes a vacuum circuit breaker tube having a vacuum housing in which a contact system is disposed. The contact system includes two contacts which are movable relative to one another. An electrical pre-arcing unit having an ignition electrode in the vacuum housing is provided for igniting an arc along an arc current path.

A vacuum interrupter (1) is equipped with a vacuum container (2) and a fixed electrode (3) and a movable electrode (4), which are provided in the vacuum container (2). The vacuum container (2) is constructed by hermetically joining a fixed-side end plate (6) to one end portion of an insulating tube (5) and by hermetically joining a movable-side end plate (7) to the other end portion of the insulating tube (5). The insulating tube (5) is equipped at its end portion with a projection portion (5a) that projects in an axial direction of the insulating tube (5) along an outer periphery of the insulating tube (5). The insulating tube (5) is equipped at its end portion with an end plate joining portion (5b) that projects from a base end portion of the projection portion (5a) in an inner peripheral direction of the insulating tube (5). The end plate joining portion (5b) is equipped on its surface with a metallized layer (8) to which the fixed-side end plate (6) (or the movable-side end plate (7)) is joined by brazing. The metallized layer (8) is equipped with a joining portion (8a) that extends in a radial direction of the insulating tube (5), and an extension portion (8b) that extends in an axial direction of the insulating tube (5) from an end portion of the joining portion (8a) on an inner peripheral side of the insulating tube (5).

A vacuum interrupter having a structure to trap running cathode tracks is disclosed. The interrupter includes a first electrode assembly and a second electrode assembly, at least one of which is moveable. The interrupter also includes a sidewall having a longitudinal axis. One or more trench structures are formed in at least one of the electrode assemblies. Each trench structure has an opening that faces the other electrode assembly in a direction that is parallel to the longitudinal axis, to trap the running cathode tracks to prevent them from getting close to the sidewall.

A vacuum interrupter includes a housing having at least one annular ceramic insulating element which forms a vacuum chamber. A contact system has two contacts which are movable relative to one another. A capacitive element has two electrodes and a dielectric material disposed between the electrodes. The capacitive element is form-lockingly mounted on the insulating element and has a capacitance between 400 pF and 4000 pF. A high-voltage switching assembly including the vacuum interrupter is also provided.

A pole assembly of a switching device is provided. The pole assembly includes a first interrupter unit operably connected to a pole plate of the pole assembly via first post insulators. The first interrupter provides a path for current flow through the first interrupter in a closed state and interrupts the current flow in an open state. A second interrupter unit is operably connected to the first interrupter unit and to the pole plate via second post insulators. The second interrupter allows the current flow through the first interrupter unit in an open state and grounds the switching device in a closed state. The pole assembly includes a dielectric shield physically disposable between and operably connected to the first post insulators and the second post insulators for uniformly distributing an electric field generated during operation of the pole assembly.