| 摘要 |
FIELD: electrical engineering, particularly devices preventing sparking of machines or apparatus used in chemical, oil refinery, gas-processing, metal mining industries, of portable equipment provided with built-in storage batteries, for instance mine lamps. ^ SUBSTANCE: device comprises electronic key to be connected to electrical consumer, control switch to control electronic key, overcharge signaling sensor and commutation signaling sensor, which are made as transformers, "OR" circuit, trigger, voltage doubler, integrating circuit and voltage divider. The device additionally has controller and monostable multivibrator. ^ EFFECT: simplified structure along with increased sensitivity and extended functional capabilities. ^ 3 cl, 1 dwg
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