| 摘要 |
The invention relates to a life protection device, against fulminations from electric discharges, apt to be associated to any electric apparatuses, comprising a switch of all the phases of the main feeding line, controlled by a respective control relay, and an electronic cutout circuit fed by a secondary line shunted from the main feeding line down-stream of said switch and apt to cause the switching off of said control relay. Said electronic circuit is essentially formed by a pair of cascade transistors, the first of which is cut off in normal working conditions and starts to conduct when a signal, produced by a dispersion current or a short circuit current within the apparatus, is applied on its input. |
