Improvements introduced in the object of the main patent, that is in the devices for varying the sensitivity of the circuit breakers by variation of the magnetic flux by the firing electromagnet, whose improvements imply the following particularities taken separately or in combination: a) a piece mobile magnet, preferably in the form of a cylinder, can slide, by the effect of a mechanical adjustment control, according to the axis of the moving core of the firing electromagnet, in the space comprised between the tube enclosing this core and the winding of the electromagnet, b ) the above magnetic part is replaced by a piece of suitable electrical conductivity, preferably in the form of a ring or a cylinder. C) the moving part is constituted by a magnetic tube extended by a tube of appropriate electrical conductivity. D) fixed winding is wound around the tube in which the moving core of the electromagnet is displaced and is seated by an adjustable resistance. E) combining said means with an electromagnet winding of a variable number of turns described in the main patent. (Machine-translation by Google Translate, not legally binding)
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