FIELD: systems and devices used for warning about electrical appliances and devices left alive without supervision. SUBSTANCE: warning device has set of main current-consumption sensors and warning unit; in addition, it is provided with correction unit, delay unit, and set of additional current-consumption sensors; due to such an arrangement, signal indicating ON-state of periodically turned-on current consumer is shaped even during intervals. EFFECT: provision for warning about ON-state of periodically turned-on power consumers under any operating conditions. 1 dwg
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