| 摘要 |
Device to prevent phase voltage to pass of any phase (R) (S) (T) through zero conductor and thereby to prevent passing of voltage of 380 V to the consumers of voltage of 220 V. Device comprises of circuit protective motor switch that has mechanism for mechanical switch on and off, of working contacts and a coil to switch off circuit. Bimetal connect shortly so that only working contact remains. Coil for switching off the mechanism we bind so that its one ending is bound to earth connection and the other to cathode (TH) of thyristor (KT 207/600 A4) and anode to working contact arrester toward the consumer, between a cathode and a gate, we bind a series resistor 15 K and diode (D 1A) that enable activation of thyristors in case that in zero conductor there comes that any phase (R), (S), (T) and is in ordinary mode carries out no switch on differential lock ring switch if there is any. |
