Protective relay
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United States of America Patent
Stats
-
Dec 2, 2003
Grant Date -
Feb 28, 2002
app pub date -
Aug 16, 2001
filing date -
Aug 25, 2000
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A protective relay is provided to protect circuitry against reverse battery polarity or load dump, wherein a relay coil is operatively connected to a contact switch and is fed by a reverse bias diode (which may be a Zener diode) such that the relay coil opens the switch contact when the diode is energized to protect the circuitry; wherein the protective relay optionally includes a positive temperature coefficient resistor or a current source to protect the relay coil from overheating.
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