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Surge absorbing element

  • US 9,842,676 B2
  • Filed: 05/23/2014
  • Issued: 12/12/2017
  • Est. Priority Date: 05/23/2014
  • Status: Active Grant
First Claim
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1. A surge absorber comprising:

  • a varistor substrate;

    a pair of electrodes that are electrically connected to both end faces of the varistor substrate, respectively, to sandwich the varistor substrate;

    external wirings that electrically connect to the paired electrodes, respectively;

    exterior coverings that cover the electrodes; and

    a thermal expander that is provided between the paired electrodes and that irreversibly expands with heat produced by the varistor substrate to separate at least one of the paired electrodes from the varistor substrate, whereinthe thermal expander is configured to keep an expanded state even after cooled and to enable a mark provided in the thermal expander to be viewable from outside of the thermal expander when the thermal expander expands.

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