(19)
(11) EP 0 125 391 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
10.07.1985 Bulletin 1985/28

(43) Date of publication A2:
21.11.1984 Bulletin 1984/47

(21) Application number: 84101296

(22) Date of filing: 08.02.1984
(84) Designated Contracting States:
DE FR GB IT NL

(30) Priority: 13.04.1983 JP 6358983

(71) Applicant: HITACHI, LTD.
 ()

(72) Inventor:
  • Moriya, Shigeo
     ()

   


(54) Circuit breaker


(57) Disclosed is a mechanism for automatically performing the resetting of a magnetic tripping device (9) in a circuit breaker in the following manner. The movement of a hook (3) linked with a handle (2) in the tripping operation is detected by a linkage member (11) and transmitted to a reset lever (13). Thus, a plunger (10) of the magnetic tripping device is returned into its reset position by the reset lever immediately upon the completion of the tripping operation. In the resetting operation of the handle, the linkage member detects the recovery of the hook into its initial position and returns the reset lever into initial position.






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