Patent attributes
There is provided a thermal fuse employing a thermosensitive pellet that reacts to an operating temperature with limited variation, and operates with high precision and hence high reliability. To achieve this, the thermal fuse includes a switching function member including a thermosensitive pellet, a movable conductor, and a spring member. At a prescribed operating temperature the thermosensitive pellet softens or melts to liberate the spring member from a load to cause the spring member to move the movable conductor to switch an electrical circuit located between first and second lead members. The thermosensitive pellet is formed of a thermosensitive material selected depending on a characteristic in flowability presented as it softens or melts.
