FIELD: electricity.
SUBSTANCE: device includes coil (11) connected to first (2) and second (3) potentials of line power unit. To the coil there attached are at least two short-circuit devices (12) made separate from each other and parallel switched to coil (11) of electromagnetic actuator for short circuit of the coil at reversing the coil voltage potential. Besides the device includes semi-conducting switch T3 switched between coil (11) and second potential (3) and made so that coil (11) can be detached from the second potential at voltage drop or potential reversing, and so, discharge of coil (11) does not have a negative influence on electric power supply system and does not disturb intrinsic safety.
EFFECT: improving protection reliability.
17 cl, 3 dwg
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