FIELD: automation and remote control for railroads, in particular, automatic locks. SUBSTANCE: device has stabilizing diode 2 and first resistor 3, which first terminal serves as input of threshold gate. In addition device has optical pair 1, which has light-emitting diode 7 and photodetector 8, second resistor 4, gate 5, oscillator 6 which output is connected to input of gate 5. First terminal of second resistor 4 is connected to common line through gate 5. Second terminal of second resistor 4 is connected to second terminal of first resistor 3 and to anode of light-emitting diode 7 from optical pair 1. Cathode of light-emitting diode 7 is connected to common line through stabilizing diode 2. In addition first terminal of photodetector 8 is connected to power supply line; second terminal of photodetector serves as output of threshold gate. This results in possibility to eliminate device fault firing due to operations that check stabilizing diode. EFFECT: decreased probability of emergent situation in railway automatic devices which controls safe train traffic. 1 dwg
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