(19)
(11) EP 2 023 366 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
10.03.2010 Bulletin 2010/10

(43) Date of publication A2:
11.02.2009 Bulletin 2009/07

(21) Application number: 07024632.7

(22) Date of filing: 19.12.2007
(51) International Patent Classification (IPC): 
H01H 71/52(2006.01)
(84) Designated Contracting States:
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC MT NL PL PT RO SE SI SK TR
Designated Extension States:
AL BA HR MK RS

(30) Priority: 09.08.2007 JP 2007207998

(71) Applicant: MITSUBISHI DENKI KABUSHIKI KAISHA
Chiyoda-ku, Tokyo 100-8310 (JP)

(72) Inventors:
  • Watanabe, Kazumasa
    Tokyo 100-8310 (JP)
  • Fushimi, Masahiro
    Tokyo 100-8310 (JP)
  • Murai, Masatoshi
    Tokyo 100-8310 (JP)

(74) Representative: HOFFMANN EITLE 
Patent- und Rechtsanwälte Arabellastrasse 4
81925 München
81925 München (DE)

   


(54) Circuit breaker


(57) A circuit breaker includes inside a crossbar 7, a lower link 6, a lever 4 that rotates during tripping of the circuit breaker, an upper link 12 that configures a toggle link, and main springs 2, with the circuit breaker also including a handle arm 3 that cooperates with these. The handle arm 3 comprises a frame body whose cross section is substantially U-shaped and where one end of two side plates 3b and 3c are joined together by a structural body. At least one of the side plates 3b and 3c is a separate part fixedly attached to the structural body, and the side plates 3b and 3c are fixedly attached to the structural body at positions that do not line up in a straight line on the side plates.







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