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Multiple element PTC overcurrent protection device

  • US 5,818,676 A
  • Filed: 05/16/1997
  • Issued: 10/06/1998
  • Est. Priority Date: 05/16/1997
  • Status: Expired due to Fees
First Claim
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1. A self-resetting circuit overcurrent protection device comprising:

  • at least two positive temperature coefficient elements, each element having parallel first and second electrically conductive plates separated by a layer of material having a positive temperature coefficient of resistivity, the at least two positive temperature coefficient elements being disposed in overlapping, substantially parallel relationship to one another such that the first plate of each of the elements is immediately adjacent the second plate of an adjacent element;

    at least one layer of electrical insulating material disposed between the adjacent first and second plates of the at least two positive temperature coefficient elements;

    means for electrically connecting the first plates of each of the elements with one another;

    means for electrically connecting the second plates of each of the elements with one another; and

    a first electrical lead connected to the first plate of one of the at least two elements and a second electrical lead connected to the second plate of one of the at least two elements, the first and second leads extending from the first and second plates respectively for connection to a circuit.

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