Line surge protection device for telephone lines

Details Line surge protection device for telephone lines Line surge protection device for telephone lines

H - Electricity

02

H

317/15

H02H 3/22 (2006.01) H04M 9/00 (2006.01)

Patent

CA 1050101

LINE SURGE PROTECTION DEVICE FOR TELEPHONE LINES ABSTRACT OF THE DISCLOSURE A line voltage surge protection device for telephone systems which normally include means for grounding excessive currents caused by strokes of lightning and the like. The device includes a gaseous discharge element which becomes conductive when the voltage in the line being protected momentarily exceeds a predetermined value to conduct current to a source of ground potential. A temperature sensitive element which operates upon the presence of a prolonged current serves to short the gaseous discharge element whereby the surge sensitive element includes means resiliently biasing the gaseous element for movement in a direction serving to short the same. A soldered retaining means opposes such movement, and heat developed in a coil in series with the line to be protected melts the solder permitting the shorting action to occur.

289837

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