| 摘要 |
<p>A protected telecommunications terminal has signal conductors supported in a terminal housing, and a ground conductor positioned on the housing a small distance from the signal conductors. An electrically non-linear resistive material is located electrically between and in contact with the signal and ground conductors to provide over-voltage electrical protection to the terminal. The electrically non-linear resistive element is prepared from an electrically non-linear composition which comprises a polymeric component and a particulate filler. The composition has an initial resistivity at 25 °C of at least 109 ohm-cm, and is such that a standard device containing the composition has an initial breakdown voltage V¿Si?, and after the standard device has been exposed to a standard impulse breakdown test, the device has a final breakdown voltage VSf which is from 0.7VSi to 1.3VSi. In addition, the composition in the device has a final resistivity rf at 25 °C of at least 10?9¿ ohm-cm.</p> |
