A thermal cutoff at least includes a current-carrying fusible element having two ends connected to a first electrode and a second electrode. The current-carrying fusible element is provided in a closed cavity bounded by a housing having an opening at one end, a cover plate, and a sealant. The thermal cutoff further includes a first lead wire and a second lead wire each wrapped by an insulating sheath. One end of the first lead wire and one end of the second lead wire are electrically connected to the first electrode and the second electrode. The sealant is filled in the opening of the housing, covers an electrical joint between the first lead wire and a first electrode plate and an end of the first lead wire, and also covers an electrical joint between a second electrode plate and the second lead wire and an end of the second lead wire.

A mechanical breaking and fusing combined multi-fracture excitation fuse includes a shell, wherein a cavity is formed in the shell, and at least one conductor penetrates through the shell and penetrates through the cavity; at least one excitation device and one breaking device are arranged in the cavity of the shell; the excitation device can receive an external excitation signal to drive the breaking device to act to break a conductor corresponding thereof to form at least two fractures on the conductor, at least one fuse is connected in parallel onto the conductor. The melt is connected in parallel with at least one fracture, and the melt is connected in series with at least one fracture.

A mechanical breaking and fusing combined multi-fracture excitation fuse includes a shell, wherein a cavity is formed in the shell, and at least one conductor penetrates through the shell and penetrates through the cavity; at least one excitation device and one breaking device are arranged in the cavity of the shell; the excitation device can receive an external excitation signal to drive the breaking device to act to break a conductor corresponding thereof to form at least two fractures on the conductor, at least one fuse is connected in parallel onto the conductor. The melt is connected in parallel with at least one fracture, and the melt is connected in series with at least one fracture.

A fuse element includes: a low-melting-point metal layer; a high-melting-point metal layer provided over at least one surface of the low-melting-point metal layer; and an intermediate layer disposed between the low-melting-point metal layer and the high-melting-point metal layer. Each of the high-melting-point metal layer and the intermediate layer is made of a metal that is liquefied by contacting a molten form of the low-melting-point metal layer. The high-melting point metal layer is made of silver or an alloy comprising silver as a main component thereof. A melting point of a material constituting the intermediate layer is higher than a melting point of a material constituting the low-melting-point metal layer and lower than a melting point of a material constituting the high-melting-point metal layer.

A protection element includes a first electrode (1), a second electrode (2) having a spring property, and a fuse element material (3) that is disposed between the first electrode and the second electrode, in which the fuse element material (3) is supported by being interposed between the first electrode (1) and the second electrode (2) in a bent state.

A fuse including a fuse body having a base with a central portion and first and second sidewalls, the central portion having first and second fastening holes formed therethrough, a mid-body disposed atop the central portion and having first and second troughs formed in a top surface thereof and separated by a partition wall, the mid-body further having first and second through holes formed therethrough, and a cover disposed atop the mid-body and having a central portion and first and second sidewalls, the central portion having first and second fastening bosses extending therefrom and through the first and second through holes of the mid-body and the first and second fastening holes of the base, and a conductive portion including first and second terminal portions connected by parallel first and second fuse members disposed within the first and second troughs of the mid-body and separated by the partition wall.

A fuse in form of breaking fusant by fusing breaking and mechanical breaking includes hollow shell; arc extinguishing medium filled in the shell; at least one piece of fusant arranged in the shell; and conductive terminals provided as penetrating through shell wall and capable to be connected to external circuit, two ends of the fusant are respectively connected with the conductive terminals, at least one breaking device that mechanically breaks the fusant is provided in the shell; driving device arranged outside the shell, after receiving external excitation signal, drives the breaking device to break the fusant in one of linear and rotational displacement modes or their combination; blocking structures are arranged between the breaking device and the shell wall; and the fusant located in the arc extinguishing medium is provided with weak positions where mechanical breaking strength of the fusant is reduced and fusing is easy to be achieved.

An electronic device includes chip components, a case, conductive terminals, and a fuse. The chip components each include a terminal electrode. The case includes accommodation recesses for accommodating the chip components. The conductive terminals are fixed to the case and respectively connected to the terminal electrodes of the chip components. The fuse electrically connects the chip components.

An electronic device includes chip components, a case, conductive terminals, and a fuse. The chip components each include a terminal electrode. The case includes accommodation recesses for accommodating the chip components. The conductive terminals are fixed to the case and respectively connected to the terminal electrodes of the chip components. The fuse electrically connects the chip components.

A circuit board with integrated fusing includes an insulating substrate having a circuit trace formed on a surface thereof, the circuit trace including a first circuit trace portion and a second circuit trace portion. A fusible link electrically connects the first circuit trace portion to the second circuit trace portion, the fusible link including a planar surface extending from the first circuit trace portion to the second circuit trace portion. A dielectric reflow encapsulates the fusible link on the planar surface from the first circuit trace portion to the second circuit trace portion.