(19)
(11) EP 0 232 172 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
23.08.1989 Bulletin 1989/34

(43) Date of publication A2:
12.08.1987 Bulletin 1987/33

(21) Application number: 87301023.5

(22) Date of filing: 05.02.1987
(51) International Patent Classification (IPC)4H01H 36/00, H01H 37/52, H01H 37/66
(84) Designated Contracting States:
AT BE CH DE ES FR GB GR IT LI LU NL SE

(30) Priority: 05.02.1986 GB 8602784

(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 Dyer's Buildings Holborn
London EC1N 2JT
London EC1N 2JT (GB)


(56) References cited: : 
   
       


    (54) Switching arrangement with thermal and magnetic functions


    (57) A switch combining magnetic control and thermal control. A movable contact is urged by a magnet into contact with a fixed contact. A bimetallic strip is capable of urging the movable contact out of contact with the fixed contact upon exposure to a thermal overload. For a switch responsive to both burglary and fire detection, a permanent magnet urges the movable and fixed contact into a normally closed position. When the magnet's influence is no longer felt, such as when a burglary occurs, the movable and fixed contacts will separate. A bimetallic strip, when sensing a thermal overload, will also move the movable contact out of contact with the fixed contact even in the absence of a burglary. The switch responsive to both magnetic and thermal energy is also used to protect a relay controlled circuit from thermal overload.







    Search report