Surge protection device and surge protection apparatus using thereof
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United States of America Patent
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Issued Date -
Aug 21, 2008
app pub date -
May 30, 2007
filing date -
Feb 19, 2007
priority date (Note) -
Abandoned
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Abstract
In a surge protection device 40 (40-1 or 40-2) used for a surge protection apparatus, a gas arrester 41 is connected in series with a varister group consisting of a plurality of varisters 42-1 to 42-5 which have high withstand capacity and are connected in parallel to one another and a discharge resistor 43 is connected between both electrodes of the varister group. Besides, since the varister voltages are set higher than the peak value of the AC power supply voltage, the varisters 42-1 to 42-5 are normally insulated from a power supply circuit by the gas arrester 41. Even if an abnormal voltage is applied, since an operating voltage of the varisters 42-1 to 42-5 is set higher than a peak value of the AC power supply voltage, AC power supply current will not flow. Charges stored in the varisters 42-1 to 42-5 are released quickly through the resistor 43, making it possible to prevent the gas arrester 41 from restriking. This provides a small, reliable, inexpensive surge protection device (SPD) relatively simple in structure and a surge protection apparatus using thereof.
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