Electricity: electrical systems and devices – Safety and protection of systems and devices – With specific current responsive fault sensor
Patent
1997-12-02
1999-12-14
Gaffin, Jeffrey
Electricity: electrical systems and devices
Safety and protection of systems and devices
With specific current responsive fault sensor
361 58, 361118, 361103, H02H 300
Patent
active
060025646
ABSTRACT:
An overcurrent protection thick-film resistor device and overcurrent protection circuit employing the same are provided. Overcurrent (e.g., surge current) flows into the overcurrent protection circuit due to electrical shorting between external cables and power lines in communication networks. The thick-film resistor suppresses sparks due to such overcurrent, which would otherwise negatively affect peripheral parts or components disposed around the overcurrent protection circuit. This function is achieved by providing a thick-film resistor having an elongated meander or spiral shape, and also having a width-reduced section at one location of the thick-film resistor. Any sparks will predictably occur at this width-reduced section. A casing or other spark-dampening mechanism can be disposed selectively around the width-reduced section of the thick-film resistor.
REFERENCES:
patent: 4284970 (1981-08-01), Berrin
Gaffin Jeffrey
Jackson Stephen
Murata Manufacturing Co. Ltd.
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