Importance

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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. The vacuum power interrupting device further comprises an electromagnet supported by a plurality of supporting poles 47a, 47b extending along the outer circumferential surface of the supporting block, and an adsorbed member 44 of a magnetic material responsive to the electromagnet and supported by an insulating rod 43 connected to the movable contact rod. Thus, the armature member is in contact with or away from an iron core 52 of the electromagnet in accordance with the energized or deenergized condition of the electro magnet to bring the vacuum interrupter into an interrupted condition or a closed condition.

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First Claim