CIRCUIT PROTECTIVE DEVICE
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United States of America Patent
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N/A
Issued Date -
Nov 3, 2011
app pub date -
May 3, 2010
filing date -
May 3, 2010
priority date (Note) -
Abandoned
status (Latency Note)
Importance
Abstract
A circuit protective device has a wire-wound resistor, a fuse and a voltage limiter connected by welding, and may be covered by a protective housing possibly filled with a filling material. The resistor withstands an incoming transient voltage and reduces a surge current through the voltage limiter to realize a more compact and inexpensive voltage limiter without compromising the surge protective capability. The voltage limiter clamps the incoming transient voltage to a specified level. When the wire-wound resistor or the voltage limiter is overheated by to a surge voltage which is higher than the surge voltage withstanding rating of this circuit protective device, either the wire-wound resistor melts down or the fuse opens to disconnect the electronic circuit from the AC mains against subsequent surges. Accordingly, the circuit protective device addresses a cost-saving, compact, robust and safe solution against surge voltages, surge currents and sustained voltages.
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