Abstract: A vacuum interrupter has a capacity of breaking high voltage and large electric current, and excellent anti-welding characteristics, and prevents generation of harmful surges by current chopping and reignitions, and particularly prevents surges by multi-reignition and three-phase simultaneous breaking caused by the multi-reignition. The vacuum interrupter comprises a pair of electrodes (5a, 6a) which can close or separate from each other within an electric insulating hermetic vacuum vessel (4), each electrode (5a, 6a, 15 and 28) is made of a metallic material of a mean vapor pressure, the boiling point of the metallic material being 2700 to 3300K. (2427.degree. to 3027.degree. C.), such as, for example, chromium, or a chromium alloy including a content of more than 90% chromium.

Abstract: An operating device for effecting opening and closing operation of a vacuum interrupter with an electromagnet incorporated therein comprises a supporting resin block (4) for supporting a vacuum interrupter, a first pair of poles (47a) and a second pair of poles (47b), both extending along the outer circumferential surface of the supporting resin block (4), the length of the first pair being longer than that of the second pair. The operating device further comprises a mounting plate (49) of magnetic material directly connected to the first pair and connected to the second pair through connecting rod means, and an electromagnet (52, 56) fastened to the mounting plate (49), supported by the first and second pairs and connecting rod means (57). Thus, the supporting arrangement for supporting a vacuum interrupter not only serves as a mechanically supporting member, but also does a magnetic path defining member.

Abstract: An evacuated envelope includes a cylindrical housing made of a metallic material, disc-shaped upper and lower end plates made of ceramic and stationary and movable contact rods. The envelope of the vacuum interrupter is manufactured by brazing the end plates to the housing by using a sealing member made of a hermetically deformable metallic material which deforms by thermal stress generated during a cooling process after hermetic brazing. Sealing means of the envelope is provided with surface-to-surface sealing between the seal member and the cylindrical metallic housing or the disc-shaped end plate in order to enhance the sealing performance. The envelope is hermetically sealed by deforming the sealing member after brazing the sealing member to the housing in order to further enhance the sealing performance. The sealing member further comprises a stress absorbing means provided with a curved portion for absorbing thermal and mechanical stress.

Abstract: A vacuum vessel 17 comprises a bell shaped metallic casing 20, and an insulating circular end plate 21 hermetically brazed to the opening end of the metallic casing 20. A vacuum interrupter 2 is constituted by aligning a stationary contact rod 27 with a movable contact rod 25, each having an electrical contact 18, 19 within the vessel so that the latter is in contact with the former or away therefrom. A vacuum power interrupting device comprises an insulating block 4 mounted on the vacuum interrupter so that the outer surface of the insulating end plate 21 attached to the opening end of the vacuum interrupter is pressed onto the insulating block through a sealing member 11.

Abstract: A vacuum vessel 7 comprises a bell shaped metal casing 5, and an insulating circular end plate 6 hermetically brazed to the opening end of the metal casing. A vacuum interrupter 3 is constituted by aligning a stationary contact rod 20 with a movable contact rod 17, each having an electrical contact 8,9, within the vacuum vessel so that the latter is in contact with the former or away therefrom. A vacuum power interrupting device comprises a disk-shaped resin supporting block 4 in which the vacuum interrupter is molded. A stationary electrode 23 is connected to a stationary contact rod 20 disposed within the vacuum interrupter. A tubular insulating barrier is integrally formed with the supporting block so as to surround the stationary electrode.

Abstract: A vacuum power interrupting device comprising a bell-shaped vacuum power interrupter which includes a bell-shaped metallic casing wherein a pair of electrical contact rods are extended for interrupting a large current with a high voltage, and insulating molded block made of a resin for supporting the bell-shaped vacuum power interrupter.

Abstract: The invention provides a vacuum interrupter in which an evacuated envelope includes a cylindrical housing made of a metallic material, disc-shaped upper and lower end plates made of inorganic insulating material and stationary and movable contact rods. The envelope of the vacuum interrupter is manufactured by brazing the end plates to the housing by using a sealing member made of a plastically deformable metallic material which is deformed by thermal stress generated during a cooling process after hermetic brazing. The coefficient of the housing differs from that of the upper and lower end plates. According to the present invention, the sealing performance can be enhanced, even when the thermal coefficient of the housing differs from those of the end plates, since the sealing member is used.

Abstract: An electric circuit interrupter including a pair of electrodes, one of the electrodes being relatively movable with respect to the other into and out of engagement with the other. At least one of the electrodes comprises an annular contact section and an arc driving section surrounding the annular contact section. The arc driving section is formed with a plurality of slots inwardly extending from the outer periphery of the arc driving section to divide it into arc driving segments. The slots are inclined at an angle with respect to the radius of the arc driving section and also inclined at an angle with respect to the axis of the arc driving section such that the arc driving segments can overlap the adjacent arc driving segments across the inclined slots.

Abstract: A vacuum power circuit breaker having a vacuum-bulb interrupter unit comprising a vacuum bulb consisting of a cylindrical insulating envelope and end plates attached to the axial ends of the insulating envelope, stationary and movable electrode rods projecting into the vacuum bulb through the end plates, and metallic bellows assemblies connecting the stationary and movable electrode rods to the associated end plates of the vacuum bulb. Not only the movable electrode rod but the stationary electrode rod is thus axially movable relative to the vacuum bulb so that an impact applied to the stationary electrode rod when the movable electrode rod is connected to the stationary electrode rod is absorbed by the stationary electrode rod itself. The stationary electrode rod is held fixed independently of the vacuum bulb to prevent the electrode rod from being moved away from the movable electrode rod when the latter is moved and connected to the former.