Appeal No. 2000-2037
Application No. 08/810,055
circuit protection including electrical distribution and motor
control applications. In particular, the invention relates to a
current limiting arrangement that is capable of limiting the
current in a circuit when a high current condition occurs.
Numerous devices are available for limiting the current in a
circuit when a high current condition occurs. One known limiting
device includes a filled polymer material, which exhibits what is
commonly referred to as a PTCR (positive-temperature coefficient
of resistance) or PTC effect. An attribute of the PTCR or PTC
effect is that at a certain switch temperature the PTCR material
undergoes a transformation from a basically conductive material
to a basically resistive material. In some of these PTCR current
limiting devices, the PTCR material is placed between pressure
contact electrodes. See Figure 1 of the disclosure. The
following claim is a further illustration of the invention.
17. A current limiting arrangement having operational
bounds, the current limiting arrangement comprising:
a first electrode set comprising first and second electrodes
and a first electrically conductive composite material between
the first and second electrodes;
a second electrode set comprising third and fourth
electrodes and a second electrically conductive composite
material between the third and fourth electrodes,
the first electrically conductive composite material and the
second electrically conductive material each comprising a low
2
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