FIELD: fire alarm systems. SUBSTANCE: device has alarm signalling make pickups 1, monitoring resistor 2, indicator 3, signalling make contact 4, load element 8, matching unit 9, switching unit 10 and check unit 11. When object is placed under protection, output resistance of device depends on its condition: under NORMAL conditions monitoring resistor and load elements are connected in parallel, under MAKING conditions these resistors are shorted out, under ALARM conditions monitoring resistor is disconnected, and under EMERGENCY conditions circuit is broken. Device can remain under above-indicated conditions during unlimited time which protects information from interference. At arrival of attending personnel, making of line is provided for period of charging of matching unit capacitor which is ensured by ATTENDING signal. EFFECT: enhanced functional reliability of device. 5 cl, 1 dwg
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