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Circuit protection related devices are devices that protect LEDs and accessories that protect circuits. LED protection devices protect LED electronics from overcurrent, overvoltage and transients, and prevent accidents such as failures, fires, etc. It is widely used for outdoor lighting such as runway lighting and traffic lights, and provides reverse polarity protection and ESD (electrostatic discharge / surge) protection. Accessories for circuit protection, such as fuses to prevent overcurrent, as well as a wide range of small parts such as fuse holder covers, caps, and insulation nuts, can be selected according to the application. The material used is a thermosetting resin, etc. to ensure protection of the target item. There are also products that pursue safety, such as the use of ceramic as an insulator for the cover of the fuse, etc.