An electric circuit cut-off device including a housing, a to-be-cut part, a power source, and a moving body that moves between first and second end portions on opposite sides, a fuse including a fusing portion and an arc-extinguishing material, and a pair of electrode parts connected to terminals on both sides of the fuse. The moving body is configured to cut a piece located between base pieces on both sides of the to-be-cut part and a part of the to-be-cut part and the electrode part come into contact with each other in a state where base pieces on both sides of the to-be-cut part are energized via the cut piece, and the to-be-cut part and the fuse are connected to each other; and thereafter a state in which the base pieces on both sides of the to-be-cut part are energized via the cut piece is cut off.

A method for creating a dielectric thin-film coating for devices having a fusible element is disclosed. The method comprises mixing insoluble and soluble polymers in solid form and exposing the mixture to heat to create a melt mixture. The melt mixture is then dissolved in a solvent to create a slurry which can then be deposited on the device as a thin-film coating to create an interior insulation layer or an external surface.

A fuse with an improved arc elimination performance is provided while an increase in the total length of the fuse element is prevented. A fuse 500 includes a fuse element 100 including at least one fusing portion 120 between terminal portions 110 on both sides. The fuse element 100 includes curved portions 130, which are hollowed, at positions adjacent to the fusing portion 120. An arc-eliminating material 140 is fastened in hollowed portions 131 of the curved portions 130.

It is aimed to provide a fuse element capable of interrupting an electrical circuit while suppressing the formation of carbide when an abnormal current is generated. A fuse element 10 is provided with an insulating base material 3 and a conductor layer 1 provided on a surface of the base material 3. The conductor layer 1 is physically ruptured at a temperature lower than a temperature, at which the conductor layer 1 is fused and cut, when the conductor layer 1 is energized and generates heat.

Fuse, including at least one fuse blade, formed in a sheet having two opposite main faces extending along a longitudinal axis of the fuse blade, each fuse blade comprising a portion having a reduced section defining a plane transverse to the fuse blade. The fuse also includes arc guards made of a preformed elastic material and associated in pairs, the arc guards of the same pair being each located opposite one another on a respective main face of the same fuse blade. For at least a first pair of arc guards, a layer of adhesive is interposed between the fuse blade and an internal face of each arc guard of this pair, the internal face being oriented towards one of the main faces of the fuse blade, so as to fix each arc guard on the fuse blade.