Interactive overvoltage protection device

Details Interactive overvoltage protection device Interactive overvoltage protection device

H - Electricity

02

H

317/12.4

H02H 9/06 (2006.01)

Patent

CA 1231753

INTERACTIVE OVERVOLTAGE PROTECTION DEVICE Abstract of the Disclosure An overvoltage protection device, especially for telephone equipment and the like, comprises two protectors connected directly in parallel. One protector, for example a back-to-back semiconductor diode, has a breakdown voltage below which it is a high impedance. Between the breakdown voltage and a failure voltage it has a lower impedance. Above the failure voltage it has negligible impedance. The other protector, for example a gas tube, has a range of operating voltages which extends from below the breakdown voltage of the diode, to a voltage between the breakdown voltage and the failure voltage of the diode. In operation the two protectors interact, the diode operating, for example, on faster surges and, in so doing, slowing the surge front so as to increase the likelihood that the gas tube will fire. - (i) -

452237

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