Accessory device for low-voltage switches

An accessory device for a low-voltage switch, the accessory device comprising:

• a power supply arrangement configured to provide a power supply to feed an electronic device onboard the low-voltage switch, the power supply arrangement including a magnetic core, which forms a first magnetic circuit configured to be enchained with a primary winding conductor, and a first secondary winding conductor, which is wound around the magnetic core;
• and
• a current detection arrangement configured to provide detection signals indicative of a current flowing along the primary winding conductor,
• wherein the magnetic core and the current detection arrangement are arranged next to each other,
• wherein the accessory device comprises magnetic shield elements interposed, at least partially, between the magnetic core and the current detection arrangement,
• wherein the accessory device comprises a first magnetic shield element and a second magnetic shield element, which are made of a magnetic material and are arranged in proximal position respectively to the magnetic core and to the current detection arrangement, and a third magnetic shield element, which is made of a non-magnetic material and is interposed between the first and second magnetic shield elements,
• wherein the current detection arrangement includes a non-magnetic core, which forms a second magnetic circuit configured to be enchained with the primary winding conductor, and at least a second secondary winding conductor, which is wound around the non-magnetic core,
• wherein the magnetic core and the non-magnetic core are arranged next to each other, and
• wherein the magnetic shield elements are interposed, at least partially, between the magnetic core and the non-magnetic core.