Primary telephone line protector with fail safe
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United States of America Patent
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-
Apr 9, 2002
Issued Date -
N/A
app pub date -
Apr 11, 2000
filing date -
Mar 9, 1998
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A telephone line protection element constructed of three lead frames having contact fingers for holding therebetween a semiconductor cell providing overvoltage protection between the telephone line and the customer circuits. The lead frames are soldered to a resistive semiconductor material to provide a fail-safe mechanism that mechanically connects either the tip or ring telephone line conductors to ground if a sufficient overcurrent exists. In response to an overcurrent, the resistive semiconductor material generates heat and melts the solder in contact therewith, which allows a pre-bent member of the lead frame to move in contact with a ground terminal, thereby shunting the overcurrent to ground. The entire protection element includes very few components and is efficiently assembled and attached to the pins of a 5-pin module.
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