Patent ID: 6778375
Filing Date: 2004-08-17
Classification: H02H

Abstract:
A permanently-connected building entrance shunting surge protector for a power line to a building having a building ground at a location adjacent to a building entrance,said protector comprising a protector sub-circuit, said protector sub-circuit comprised of a metal-oxide varistor and a gas-discharge tube, said metal-oxide varistor and said gas-discharge tube being connected in series between the power line and the building around at a location adjacent to the building entrance whereby surges on the power line are shunted to the building ground through said series-connected metal-oxide varistor and gas-discharge tube, the gas-discharge tube having two line electrodes and there being two metal-oxide varistors in the protector sub-circuit, with each of the two metal-oxide varistors connected to one electrode of the two line electrodes of the gas-discharge tube respectively, so as to provide paralleling of the metal-oxide varistors between the power line and the building ground through the gas-discharge tube.