33kV Silicone D-Fuse (Drop-Out Fuse) is a high-voltage protective device used on 33kV overhead distribution lines and transformers. It is made with a silicone rubber (polymer) insulator for excellent insulation, weather resistance, and durability. The fuse automatically disconnects the circuit during overload or short-circuit faults, and the fuse tube drops open to provide visible isolation for safe maintenance.