Electrical resistance element and use of this resistance element

Details Electrical resistance element and use of this resistance element Electrical resistance element and use of this resistance element

1994-08-18

1997-02-11

Hoang, Tu

Electrical resistors

Resistance value responsive to a condition

Current and/or voltage

338225D, H01C 710

Patent

active

056025203

ABSTRACT:
The electrical resistance element (10) includes a resistance body (3), which is arranged between two plane-parallel, pressurized electrodes (1, 2), has PTC behavior and comprises a polymer matrix and two filler components of electrically conducting particles embedded into the polymer matrix (4).
When a short-circuit current occurs, the resistivity of the resistance body (3) changes abruptly above a temperature limit value in a surface layer resting on the electrodes and containing at least a first of the two filler components. A second of the two filler components is selected such that a composite material containing at least the polymer matrix and the second filler component has PTC behavior, with an abruptly changing behavior greater by at least one order of magnitude in comparison with the surface layer. At the same time, this composite material has a resistivity which is lower by at least one order of magnitude than a composite material formed by the polymer matrix and the first filler component.
The resistance element has a high nominal current carrying capacity and can limit large short-circuit currents permanently.

REFERENCES:
patent: 4486737 (1984-12-01), Ott
patent: 4545926 (1985-10-01), Fouts, Jr. et al.
patent: 4560498 (1985-12-01), Horsma et al.
patent: 4743321 (1988-05-01), Soni et al.
patent: 4801784 (1989-01-01), Jensen et al.
patent: 5190697 (1993-03-01), Ohkita et al.
patent: 5414403 (1995-05-01), Greuter et al.

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