Cable winding devices like cable reels or cable boxes can become very hot in the centre of the rolled-up cable. For this reason temperature switches (overheating protection) are stipulated to interrupt the current at around 65 degrees Celsius. Without this overheating protection, the cable insulation can melt and lead to destruction or fire of the winding device. To prevent an unnecessary premature switch-off of the electricity, the cable roll should be unwound.