초록 ▼

A dual-functional fuse unit, which is responsive to an electric current and an ambient temperature, contains a current sensing fuse and a temperature sensing fuse element. The current sensing fuse is serially connected with and between lead terminals of the fuse unit directly or through an intermedi

A dual-functional fuse unit, which is responsive to an electric current and an ambient temperature, contains a current sensing fuse and a temperature sensing fuse element. The current sensing fuse is serially connected with and between lead terminals of the fuse unit directly or through an intermediate conductor member. The current sensing fuse or the intermediate conductor member is urged but kept from moving when the temperature sensing fuse element is in a solid state. When the fuse element melts at a specified ambient temperature the urged current sensing fuse or the intermediate conductor member is displaced by the urging force so that the lead terminals are electrically disconnected from each other. In other embodiment, an urged cutter member in the case is normally kept from moving but is driven to sever the element of the current temperature fuse when the temperature sensing fuse element melts at a specified ambient temperature.

대표청구항 ▼

[ What is claimed is:] [4.] A dual-functional fuse unit that is responsive to an electric current and an ambient temperature, the fuse unit comprising:(a) a case;(b) a pair of lead terminals attached to said case;(c) a temperature sensing fuse element fixedly disposed in said case when said temperat

[ What is claimed is:] [4.] A dual-functional fuse unit that is responsive to an electric current and an ambient temperature, the fuse unit comprising:(a) a case;(b) a pair of lead terminals attached to said case;(c) a temperature sensing fuse element fixedly disposed in said case when said temperature sensing fuse element is in a solid state;(d) a current sensing fuse disposed in said case;(e) a conductor member disposed in said case, said current sensing fuse and said conductor member being electrically connected with each other in series and further electrically connected with and between said pair of lead terminals in series;(f) a compression coil spring disposed in said case between said temperature sensing fuse element and said conductor member for urging said conductor member in a direction away from said fuse element; and(g) a holding pin disposed in said case through said coil spring for keeping said conductor member from moving when said temperature sensing fuse element is in a solid state, said holding pin having a first part and a second part, said first part being fixedly attached to said conductor member and said second part being securely embedded in said fuse element so that when said fuse element melts at a specified temperature said holding pin is released from said fuse element and said conductor member is displaced by the urging force of said spring and the electrical connection between said first and second lead terminals is cut off.