| 摘要 |
PCT No. PCT/SE81/00392 Sec. 371 Date Aug. 10, 1982 Sec. 102(e) Date Aug. 10, 1982 PCT Filed Dec. 23, 1981 PCT Pub. No. WO82/02287 PCT Pub. Date Jul. 8, 1982.An arrangement for protection of circuits in a telephone exchange against overvoltages like for example lightning transients or so called longitudinal disturbances appearing on the lines connected to the exchange. The arrangement having at least two non-linear electronic circuit elements (T2, T3) which selectively shunt the overvoltages to ground, the junction between the conduction states, conducting-non-conducting, for at least one of the circuit elements being controllable. |
