(19)
(11) EP 0 232 473 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
09.09.1987 Bulletin 1987/37

(43) Date of publication A2:
19.08.1987 Bulletin 1987/34

(21) Application number: 86115277

(22) Date of filing: 12.03.1982
(84) Designated Contracting States:
CH DE FR GB IT LI

(30) Priority: 12.03.1981 JP 3555281
12.03.1981 JP 3555481
12.03.1981 JP 3555581
12.03.1981 JP 3555681
12.03.1981 JP 3555781

(71) Applicant: MITSUBISHI DENKI KABUSHIKI KAISHA
 ()

(72) Inventors:
  • Yamagata, Shinji
     ()
  • Hisatsune, Fumiyuki
     ()
  • Terachi, Junichi
     ()
  • Yoshiyasu, Hajimu
     ()

   


(54) A circuit breaker


(57) The present invention relates to a circuit breaker wherein a pair of rigid conductors (201, 301) which are disposed therein and at least one of which has a movable portion that separates a pair of contacts (202, 302) by an electromagnetic force produced by an excess current flowing through the contacts (202, 302) adapted to come into and out of contact with and from each other, are provided with arc shields (6, 7) in a manner to surround the contacts (202, 302), thereby to bring forth the effects of increasing the arc voltage of an electric arc struck across the contacts (202, 302) and raising the separating speed of the contacts (202, 302).






Search report