Telephone line overvoltage protection apparatus
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United States of America Patent
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Oct 25, 1994
Issued Date -
N/A
app pub date -
Jun 9, 1993
filing date -
Jun 8, 1992
priority date (Note) -
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Abstract
An overvoltage protection apparatus used with a pair of telephone lines includes first voltage clamping circuitry for clamping voltage signals on the lines at a first predetermined voltage potential. The first voltage clamping circuitry is formed by at least a pair of solid-state protective chip devices and a failure mode mechanism adapted for connecting the lines to ground responsive to increased temperature of the solid-state protective chip device and providing a ground connection for the pair of solid-state protective chip devices. A pair of current limiting resistors operatively connected to the failure mode mechanism provide sneak current protection.
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