FIELD: electricity.
SUBSTANCE: switchbox comprises current switch with solenoid drive, energy storage device, electronic controller supplied from external power transmission line and controlling energy supply from the storage device to solenoid drive. The switchbox also contains a tool to execute procedure in emergency situations, which is coupled to electronic controller and equipped with an additional energy storage device. The tool to execute procedure in emergency situations is configured so that it can actuate current switch and open the respective electric circuit in emergency situation when power from the external power transmission line drops, when it is not-available or is supplied irregularly.
EFFECT: providing switch lock, which may be associated with middle voltage panel and which operates in reliable way in critical conditions.
16 cl, 4 dwg
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