FIELD: detection of number of unattended relay station which is subjected to breaking up. SUBSTANCE: device has detectors of decreased excess pressure, resistive detectors of number of container, power supply, indicator of serial number of fired detector. Each container has diode, which is connected to input and output wires of communication line pieces, alarm detector of decreased excess pressure. Latter detector is designed as circuit breaker which is fired when excess pressure is decreased, and alternating-current power supply. EFFECT: decreased error in firing. 2 cl, 2 dwg
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