FIELD: electrical engineering; protection of electrical installations against damage and human beings against electric shock. SUBSTANCE: safety device has phase and neutral cores of current transformer connected to current collector terminals. Overload and short-circuit protective device such as fuse is inserted in phase lead. Power circuit of switching member, such as triac anode and cathode, is connected to current collector terminals and control circuit of switching member, including gate electrode of triac, to control device powered from supply mains, for example, to electronic amplifier whose input is connected to secondary winding of differential current transformer. EFFECT: enlarged functional capabilities of device. 1 dwg
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