JP2014007116A5 - - Google Patents

Claims (3)

Inside the cylindrical case having good conductivity and good thermal conductivity, at least a temperature-sensitive pellet that melts or softens at a specific temperature, a strong compression spring that presses the temperature-sensitive pellet, and an opening end of the cylindrical case An insulating tube to be closed, a weak compression spring in contact with the insulating tube, a first lead having an inner end penetrating the insulating tube as a contact portion, and the first lead and the cylindrical case are electrically connected. In the temperature-sensitive pellet type thermal fuse having a movable contact and further comprising a second lead disposed at one end of the cylindrical case, an inner edge of the first lead is formed on the insulating tube. A temperature-sensitive pellet type thermal fuse characterized by being surrounded by a peripheral wall and narrowing a gap between the insulating tube and the movable contact to suppress an exposed area of an inner end of the first lead . 2. The ratio of X / L1 is at least 1.0 or more , wherein the gap between the insulating tube and the movable contact is L1, the distance from the first lead end to the weak compression spring is X, and the ratio of X / L1 is at least 1.0. The temperature-sensitive pellet type thermal fuse described in 1. 3. The temperature-sensitive pellet type thermal fuse according to claim 1, wherein an outer peripheral corner of an inner end of the first lead is rounded . 4.