| 摘要 |
Protective device against potential occurrence in zero potential consists of a contactor switch with an electric magnet (1), switch on keys (2) and switch off keys (3) semiconductor element zener diodes BZ 12 (4) with an option of different feature (4) and contactors electromagnetic relay 12V (5). Potential occurrence in null conductor, the semi-conducting element zener diode BZ 12 (4) becomes conductive, then it activates contactors electromagnetic relay 12 V (5) which, by its contacts, switches off the circuit of the control circuit of contactor (switch off with electric magnet (1).
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