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Heat actuated fuse apparatus with solder link

  • US 5,097,247 A
  • Filed: 06/03/1991
  • Issued: 03/17/1992
  • Est. Priority Date: 06/03/1991
  • Status: Expired due to Term
First Claim
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1. A heat actuated fuse for opening at a predetermined actuation temperature, said fuse comprising:

  • a. an electrically insulating substrate;

    b. first and second electrodes disposed on a surface of the substrate in a spaced apart relationship to define a gap therebetween, each of said electrodes comprising a layer of electrically conductive material;

    c. a layer of a first solder material disposed on each of the first and second electrodes, said first solder material having a melting temperature which is substantially higher than the predetermined actuation temperature;

    d. a conductive link extending across the gap and disposed on at least a portion of each of said first and second electrodes and on the surface of the substrate between said electrodes, said conductive link comprising a predetermined quantity of a second solder material which is in contact with the layer of solder on each of the first and second electrodes, said second solder material having a melting temperature which substantially corresponds to the predetermined actuation temperature, and said predetermined quantity of said second solder material being containable on the first and second electrodes after melting; and

    e. a quantity of flux containing material disposed in contact with at least a portion of the conductive link.

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