(19)
(11) EP 0 386 768 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
29.04.1992 Bulletin 1992/18

(43) Date of publication A2:
12.09.1990 Bulletin 1990/37

(21) Application number: 90104459.4

(22) Date of filing: 08.03.1990
(51) International Patent Classification (IPC)5: H01H 83/20, H01H 71/04
(84) Designated Contracting States:
CH DE FR GB IT LI

(30) Priority: 10.03.1989 JP 58530/89
13.03.1989 JP 60213/89
13.03.1989 JP 60214/89

(71) Applicant: MITSUBISHI DENKI KABUSHIKI KAISHA
Chiyoda-ku Tokyo-to, 100 (JP)

(72) Inventors:
  • Matsumoto, Shigeru
    K.K. 1-8, Midorimachi, Fukuyama-shi, 720 (JP)
  • Sato Eiichi
    K.K. 1-8, Midorimachi, Fukuyama-shi, 720 (JP)
  • Akiyama, Toshihiro
    K.K. 1-8, Midorimachi, Fukuyama-shi, 720 (JP)

(74) Representative: KUHNEN, WACKER & PARTNER 
Alois-Steinecker-Strasse 22
85354 Freising
85354 Freising (DE)


(56) References cited: : 
   
       


    (54) Circuit device having circuit breaking and leakage current detecting functions


    (57) A circuit device including a leakage alarm function by incorporating in the breaker case (2) a zero-phase current transformer (7) for detecting a leakage current and a leakage relay (22) for issuing leakage alarm at reception of detection signal from said zero-phase current transformer which is mounted at a remote location from main parts of the circuit breaker of the casing. Provision is also made for a particularly advantageous arrangement of indicators (28) and switch actuating mechanism.







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