(19)
(11) EP 0 283 138 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
21.03.1990 Bulletin 1990/12

(43) Date of publication A2:
21.09.1988 Bulletin 1988/38

(21) Application number: 88301409.4

(22) Date of filing: 19.02.1988
(51) International Patent Classification (IPC)4: H01H 61/017
(84) Designated Contracting States:
AT BE CH DE ES FR GB GR IT LI LU NL SE

(30) Priority: 19.03.1987 GB 8706573

(71) Applicant: Yang, Tai-Her
Si-Hu Town Dzan-Hwa (TW)

(72) Inventor:
  • Yang, Tai-Her
    Si-Hu Town Dzan-Hwa (TW)

(74) Representative: Arthur, Bryan Edward et al
Withers & Rogers 4 Dyers Buildings Holborn
London, EC1N 2JT
London, EC1N 2JT (GB)


(56) References cited: : 
   
       


    (54) Thermo-activating breaker


    (57) A normally-closed bimetal switch 1 comprises a pair of electrical switch contacts (6,8), a bimetallic strip (7), which carries one of the contacts (6), and a transparent glass envelope (2), within which the contacts (6,8) and the bimetallic strip (7) are hermetically sealed. The envelope (2) contains a gas, such a neon, at low pressure. The composition and pressure of the gas are so chosen that on opening of the contacts (6,8) a gas discharge is set up which is visible through the envelope (2), and thus acts as an alarm, and which produces sufficient heat to prevent or substantially delay the re-closing of the contacts (6,8).







    Search report