The UltraSafe Fuse Holder by Ferraz Shawmut is a truly safe and convenient way to hold fuses. Use these fuse holders for your DC-DC fuses and ceramic heater fuses for a clean and professional installation. Rated to 1000VDC. Back of fuse holder is designed to mount to a DIN mounting rail (sold separately). Screw terminals accept 14-6AWG solid or stranded copper wire.