(19)
(11) EP 1 429 359 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
08.09.2004 Bulletin 2004/37

(43) Date of publication A2:
16.06.2004 Bulletin 2004/25

(21) Application number: 03019768.5

(22) Date of filing: 29.08.2003
(51) International Patent Classification (IPC)7: H01H 37/76, C22C 12/00
(84) Designated Contracting States:
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LI LU MC NL PT RO SE SI SK TR
Designated Extension States:
AL LT LV MK

(30) Priority: 13.12.2002 JP 2002361701

(71) Applicant: Uchihashi Estec Co., Ltd.
Chou-ku, Osaka-shi, Osaka (JP)

(72) Inventor:
  • Tanaka, Yoshiaki
    Chuo-ku, Osaka-shi, Osaka (JP)

(74) Representative: Fleuchaus, Leo, Dipl.-Ing. et al
Fleuchaus & Gallo Melchiorstrasse 42
81479 München
81479 München (DE)

   


(54) Alloy type thermal fuse and material for a thermal fuse element


(57) An alloy type thermal fuse of an operating temperature of 75 to 120°C is provided in which a fuse element of a Bi-In-Sn alloy is used, excellent aging and heat cycle resistances for a long term can be ensured, and satisfactory operating characteristic can be ensured.
A material for a thermal fuse element has an alloy composition in which In is 15% or larger and smaller than 37%, Sn is 5% or larger and 28% or smaller, and balance Bi, and in which, with respect to each of reference points of ternary Bi-In-Sn eutectic points of 57.5%Bi-25.2%In-17.3%Sn and 54.0%Bi-29.7%In-16.3%Sn, a range of ±2%Bi, ±1%In, and ±1%Sn is excluded.






Search report