FIELD: electrical engineering. SUBSTANCE: switch has differential transformer with annular core placed between first pair of primary phase winding conductors and second pair of primary neutral winding conductors. Primary phase winding is connected by phase circuit of supply end and primary neutral winding, by neutral circuit of load end. Two leads of check are connected to phase contacts on load side and to neutral contacts. EFFECT: improved design. 4 cl, 6 dwg
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