(19)
(11) EP 0 718 860 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
22.10.1997 Bulletin 1997/43

(43) Date of publication A2:
26.06.1996 Bulletin 1996/26

(21) Application number: 95119341.6

(22) Date of filing: 07.12.1995
(51) International Patent Classification (IPC)6: H01H 33/66
(84) Designated Contracting States:
DE FR GB

(30) Priority: 22.12.1994 JP 319765/94

(71) Applicant: HITACHI, LTD.
Chiyoda-ku, Tokyo 100 (JP)

(72) Inventors:
  • Tanimizu, Toru
    Hitachi-shi, Ibaraki 319-12 (JP)
  • Hakamata, Yoshimi
    Hitachi-shi, Ibaraki 316 (JP)
  • Goto, Yoshitomo
    Hitachi-shi, Ibaraki 316 (JP)
  • Kobayashi, Masato
    Hitachi-shi, Ibaraki 316 (JP)
  • Komuro, Katsuhiro
    Hitachi-shi, Ibaraki 316 (JP)

(74) Representative: Strehl Schübel-Hopf Groening & Partner 
Maximilianstrasse 54
80538 München
80538 München (DE)

   


(54) Vacuum valve and vacuum circuit breaker utilizing said vacuum valve


(57) To provide a low cost and a high reliable vacuum valve which can improve the production efficiency and the vacuum tightness of the vacuum valve, and a vacuum circuit breaker using the vacuum valve. Inside a insulating housing 1, a pair of separable conductors in the central axial direction of the sealed vacuum vessel composed of a stationary conductor 3 and amovable conductor 5 are disposed. A stationary conductor 3 having an external surface being broader than a contact area of the separable conductors 3, 5 is jointed to the lower end portion 1B of the insulating housing 1 and the lower end portion 1B of the insulating housing 1 is sealed thereby.






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