Abstract: Provided is a temperature-sensitive pellet-type thermal fuse having excellent reliability including an insulation property after having operated. The fuse includes, in a tubular case with high electrical conductivity and high thermal conductivity, at least a temperature-sensitive pellet being capable of melting and softening at a specific temperature, a strong compression spring pressing the temperature-sensitive pellet, an insulating lid body closing an end portion of an opening of the tubular case, a weak compression spring being in contact with the insulating lid body, a first lead having an inner end penetrating the insulating lid body as a stationary contact, and a movable contact electrically connected to the first lead and the tubular case, and further includes a second lead disposed at an end of the tubular case.

Abstract: The temperature sensitive pellet type thermal fuse includes: a conductive envelope having an opening at a first end; a temperature sensitive device housed inside the envelope; a first lead which is installed in the opening of the envelope and has a fixed contact; a second lead connected to a second end of the envelope; a movable contact housed in the envelope; and a weak compression spring housed in the envelope. The temperature sensitive device includes a cylindrical case having an open end which may be arranged at the side of the first lead, a temperature sensitive material housed in the cylindrical case, and a strong compression spring configured to press against the temperature sensitive material.

Abstract: The temperature sensitive pellet type thermal fuse includes: a conductive envelope having an opening at a first end; a temperature sensitive device housed inside the envelope; a first lead which is installed in the opening of the envelope and has a fixed contact; a second lead connected to a second end of the envelope; a movable contact housed in the envelope; and a weak compression spring housed in the envelope. The temperature sensitive device includes a cylindrical case having an open end which may be arranged at the side of the first lead, a temperature sensitive material housed in the cylindrical case, and a strong compression spring configured to press against the temperature sensitive material.

Abstract: An insulating package is provided with an insulating base having a bottom plate and frame body, electrodes led from the inside to the outside of the insulating base, and a metal cap to seal the frame body. The metal cap is adhered to the frame body by low melting point glass. This low melting point glass contains at least one selected from a group consisting of Al, Ni, Ag, BaTiO3, NiCr, TiB, and TiO2, and inside the glass, spherical particles with diameters of 10 &mgr;m or more are dispersed.