| 摘要 |
<p>An electric meter of the type having a meter movement enclosed by a cover fastened to an insulating baseplate, through which pass two or more conducting members for supplying electrical current to the movement, is provided with an overvoltage surge arrester module mounted in the baseplate. The module comprises a disc-shaped wafer of varistor material, with a conductive contact layer on each face, fitted inside an insulating cup, a bottom face of the wafer being substantially parallel to, and spaced from, the bottom of the cup. A conductive electrode member is mounted on the outside cup bottom with an end passing through the bottom of the cup and spaced a predetermined distance from the bottom face of the water to form a gap in series with the wafer. The cup is inserted, open end first, into a receiving well in the outside of the baseplate and fastened in place. A spring contact in the receiving well contacts the opposite, top face of the wafer on insertion of the cup into the well.</p> |
