FIELD: electrical engineering. SUBSTANCE: invention is designed to keep storage batteries of miner's lamps in charged condition. Device includes insulation wheel with two-way break-before-make contacts arranged over perimeter contacting current-conductive ring anchored on wheel, actuating relay put on shaft of electric drive, master unit for series connection of fixing contacts to current- conductive ring and information contact. With rotation of shaft information contact connects proper storage battery in sequence via two-way break-before- make contacts to unit to test charging. With complete charging storage battery is disconnected. EFFECT: enhanced reliability of device. 2 dwg
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