Recoverable fuse

The utility model discloses a recoverable fuse, which comprises a cylindrical housing. The housing is axially provided with a through hole. A drainage input terminal and a drainage output terminal are respectively arranged at the two ends of the through hole. An insulating ceramic tube is disposed in the through hole. The two ends of the insulating ceramic tube are in sealed contact with the drainage input terminal and the drainage output terminal respectively. The insulating ceramic tube is provided with two small holes and is filled with metallic sodium for conducting the drainage input terminal and the drainage output terminal. A confluence storage cavity disposed inside the housing is on the same side with the two small holes and is communicated with the small holes. A mica glass layer is arranged among the inner wall of the through hole, the drainage input terminal, the drainage output terminal and the insulating ceramic tube. During the occurrence of a short-circuit fault or an overload condition, the metallic sodium is molten to flow into the confluence storage cavity through the two small holes. The already fused recoverable fuse can be placed in a customized heating box to heat the metallic sodium, so that the metallic sodium is molten to flow back into the insulating ceramic tube.