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Electromagnetic by means of current in the case of the switch with a by means of which comes next of the switch in the switch-on position, the influence of the switch gear stronger tensioned detaching spring to make it more difficult the release
Electromagnetic by means of current in the case of the switch with a by means of which comes next of the switch in the switch-on position, the influence of the switch gear stronger tensioned detaching spring to make it more difficult the release