FIELD: electrical engineering; relay protective gear.
SUBSTANCE: proposed device has slave relay whose output contact is used for connection to logic controller circuit, dc voltage supply, switching device contact passing current from dc voltage supply, dc mains ground fault detecting circuit in the form of voltage divider whose common point is connected to first lead of alarm relay coil, and second lead is connected to grounding conductor; in addition it is provided with controlled current supply and voltage relay; input of controlled current supply is connected to second lead of switching device contact lead and first output, to first lead of slave relay coil; input of voltage relay is connected to first input of controlled current supply, its first output, to second input of controlled current supply, and second output, to second input of controlled current supply and to minus terminal of dc voltage supply.
EFFECT: enhanced operating reliability.
1 cl, 1 dwg
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