A loading assembly of a switch of an electrical switchboard, the assembly comprising: - a loading spring for loading the switch; - an operating lever movable from a first position to a second position to perform loading strokes of the spring; - a transmission on one side coupled to the operating lever and on the other side to the loading spring; wherein the transmission comprises at least one gear wheel, the operating lever comprising a first end coupled to the gear wheel; wherein the assembly comprises a supporting wall, the gear wheel coupled to the lever being supported in rotation relative to the wall by a pin having an axis; also the first end of the lever being rotatable about the axis; characterised in that the gear wheel comprises a sleeve fitted rotatable in both directions on the pin and a gear ring fitted on an outer portion of the sleeve; the lower portion of the sleeve being a portion configured to couple to the first end of the lever; wherein the lower portion of the sleeve and the first end of the lever comprise shaped coupling portions configured in such a way that during the loading stroke, the lever actuates the transmission only after passing an intermediate position between the first and second position; wherein the coupling between sleeve and gear ring is such that the sleeve drives in rotation the gear ring only during the loading stroke of the lever from the first to the second position; from the second to the first position the lever drives in rotation the sleeve with gear ring stopped so as not to lose the loading made on the main spring. - a loading spring for loading the switch; - an operating lever movable from a first position to a second position to perform loading strokes of the spring; - a transmission on one side coupled to the operating lever and on the other side to the loading spring; wherein the transmission comprises at least one gear wheel, the operating lever comprising a first end coupled to the gear wheel; wherein the assembly comprises a supporting wall, the gear wheel coupled to the lever being supported in rotation relative to the wall by a pin having an axis; also the first end of the lever being rotatable about the axis; characterised in that the gear wheel comprises a sleeve fitted rotatable in both directions on the pin and a gear ring fitted on an outer portion of the sleeve; the lower portion of the sleeve being a portion configured to couple to the first end of the lever; wherein the lower portion of the sleeve and the first end of the lever comprise shaped coupling portions configured in such a way that during the loading stroke, the lever actuates the transmission only after passing an intermediate position between the first and second position; wherein the coupling between sleeve and gear ring is such that the sleeve drives in rotation the gear ring only during the loading stroke of the lever from the first to the second position; from the second to the first position the lever drives in rotation the sleeve with gear ring stopped so as not to lose the loading made on the main spring. wherein the transmission comprises at least one gear wheel, the operating lever comprising a first end coupled to the gear wheel; wherein the assembly comprises a supporting wall, the gear wheel coupled to the lever being supported in rotation relative to the wall by a pin having an axis; also the first end of the lever being rotatable about the axis; characterised in that the gear wheel comprises a sleeve fitted rotatable in both directions on the pin and a gear ring fitted on an outer portion of the sleeve; the lower portion of the sleeve being a portion configured to couple to the first end of the lever; wherein the lower portion of the sleeve and the first end of the lever comprise shaped coupling portions configured in such a way that during the loading stroke, the lever actuates the transmission only after passing an intermediate position between the first and second position; wherein the coupling between sleeve and gear ring is such that the sleeve drives in rotation the gear ring only during the loading stroke of the lever from the first to the second position; from the second to the first position the lever drives in rotation the sleeve with gear ring stopped so as not to lose the loading made on the main spring.