(19)
(11) EP 1 973 133 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
11.11.2009 Bulletin 2009/46

(43) Date of publication A2:
24.09.2008 Bulletin 2008/39

(21) Application number: 07254459.6

(22) Date of filing: 14.11.2007
(51) International Patent Classification (IPC): 
H01H 33/16(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: 22.03.2007 KR 20070028206
30.10.2007 EP 07254282

(71) Applicant: Korea Electro Technology Research Institute
Gyeongsangnam-do (KR)

(72) Inventors:
  • Song, Ki-dong
    Kyungsangnam-do (KR)
  • Park, Kyeong-Yeob
    Kyungsangnam-do (KR)
  • Lee, Yoo-Yeong
    Kyungsangnam-do (KR)
  • Lee, Byeong-Yun
    Kyungsangnam-do (KR)
  • Jeong, Jin-Gyo
    Kyungsangnam-do (KR)
  • Kim, Heung-Kyu
    Kyungsangnam-do (KR)
  • Oh, Yeon-Ho
    Kyungsangnam-do (KR)
  • Cho, Yong-Sung
    Kyungsangnam-do (KR)
  • Lee, Se-Hee ga-303 Electro Technology Research Institute
    Kyungsangnam-do (KR)

(74) Representative: Musker, David Charles et al
R.G.C. Jenkins & Co. 26 Caxton Street
London SW1H 0RJ
London SW1H 0RJ (GB)

   


(54) Circuit breaker using arc contact


(57) A circuit breaker is disclosed, which has a resistor interposed in an arc contact to make a small breaking current flow, to facilitate breaking a fault current and to facilitate insulation recovery after breaking the fault current so that a breaking performance can be ultimately enhanced. A cylinder is filled with an arc-extinguishing gas. A fixed main contact is formed in the cylinder. A movable main contact is connected to the fixed main contact to form a first current path and then is separated from the fixed main contact for breaking a fault current at the time of detecting the fault current. A fixed arc contact is formed in the cylinder and has a resistor interposed between a body and a tip of the fixed ac contact for reducing the fault current. A movable arc contact is connected to the fixed arc contact to form a second current path so that the movable arc contact is in contact with the resistor of the fixed arc contact and then is separated from the fixed arc contact for reducing the fault current at the time of detecting the fault current.







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