- Motor-driven cord reels have an electric motor that automatically extends and retracts long extension cords in environments such as tunnels and mines, which can require a higher force than is provided by hand-winding or self-retracting cord reels. They typically operate at a slow speed and provide a steady tension on the cord, which helps prevent overstretching and damage. These reels hold extension cords that extend power to devices located at a distance from a power source.
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