Electro Magnets can be used for holding magnetical materials, but needs a current for this purpose. Applications can be safety doors, elevator doors and pick and place functions in automation. There are also Electro Magnets with an integrated Permanent Magnet, which works without a current flow and therefore will not be warmed up. This can be one reason to use the Permanent Magnet typ. Another reason can be use of less power. Please make your choice!
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