A protection switch, in particular for the supply pump of a source-dispenser, characterized in that a piston is arranged axially displaceable in a base body, whose piston carries a conductive contact plate at its lower end. Of the current and, in its upper part, is provided with a permanent magnet, to which is subordinate an additional permanent magnet of a float that is applied on an upper part of the base body and that is axially displaceable with respect to the base body, the piston with its contact plate being pushed upwards, by means of the two magnets, when the float descends, after which the contact of the contact plate with the ends of the contact pins of the protection switch and protection turned off is interrupted. Towards it (Machine-translation by Google Translate, not legally binding)
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