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, a conductor layer 1 provided on a surface of the base material 3 and an insulating protection layer 4 provided on a surface of the conductor layer 1. The protection layer 4 has a specific heat of 1.1 J.Math.g.sup.?1.Math.K.sup.?1 or more and a specific gravity of 1.0 g.Math.cm.sup.?3 or more.

A controllable circuit protector for power supplies with different voltages includes a first fuse and a second fuse connected in series to each other, a first heating unit, and at least one second heating unit in parallel to the first heating unit. A connected end of the first heating unit is electrically connected to a series-connected node between the first fuse and the second fuse, and a free end thereof forms a control terminal. When a load is irregular, the control terminal is connected to a ground terminal through a switch. For power supplies with different voltages, the effective resistance of the first heating unit and a part of the at least one second heating unit not melting is altered without causing drastic change arising from voltage variation to the total heating power, and the first fuse or the second fuse can duly melt down to protect the load.

A protection device comprises a first planar substrate, a second planar substrate, a heating element and a fusible element. The second planar substrate is attached to the underside of the first planar substrate to form a composite structure. The heating element comprises an insulating layer and a heating layer disposed thereon. The heating element is disposed on the first planar substrate, and the insulating layer is disposed between the first planar substrate and the heating layer. The fusible element is disposed above the heating element. The heating element heats up to blow the fusible element in the event of over-voltage or over-temperature.

A printed circuit board to which corresponding wiring connectors such as power wiring connectors, may be connected to couple electrical components and a power supply to the printed circuit board and a control housing, which may be used for operably storing such a printed circuit board.

A controllable circuit protector for power supplies with different voltages includes a first fuse and a second fuse connected in series to each other, a first heating unit, and at least one second heating unit in parallel to the first heating unit. A connected end of the first heating unit is electrically connected to a series-connected node between the first fuse and the second fuse, and a free end thereof forms a control terminal. When a load is irregular, the control terminal is connected to a ground terminal through a switch. For power supplies with different voltages, the effective resistance of the first heating unit and a part of the at least one second heating unit not melting is altered without causing drastic change arising from voltage variation to the total heating power, and the first fuse or the second fuse can duly melt down to protect the load.

A fuse includes first, second, and third terminals disposed on a substrate. Respective ends of one or more primary conductors of the fuse are connected to one of the first and the second terminals. The primary conductors have a first conductivity and are configured to open when a primary current between the first and the second terminals exceeds a first predetermined threshold. One or more secondary conductors have an end connected to the third terminal. The secondary conductors are configured to ignite when a secondary current through the secondary conductors exceeds a second predetermined threshold. When ignited, the secondary conductors open the primary conductors to thereby stop the primary current.

There is provided an electronic device including a first member formed to include at least a part of a substrate material, a second member formed to include at least a part of the substrate material and configured to be relatively movable with respect to the first member, and a fuse configured to include at least a part of the substrate material and configured to electrically connect the first member to the second member via the substrate material.

A complex protection device for blocking an abnormal state of current and voltage is disclosed. In the complex protection device, a resistive element is configured in the form of a structure and thus the resistive element has enhanced durability and surface mounting technology suitable for automation may be utilized, and a plurality of resistive elements is configured in various resistances and sizes to be optimally designed for product characteristics.

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, a conductor layer 1 provided on a surface of the base material 3 and an insulating protection layer 4 provided on a surface of the conductor layer 1. The protection layer 4 has a specific heat of 1.1 J.Math.g.sup.1.Math.K.sup.1 or more and a specific gravity of 1.0 g.Math.cm.sup.3 or more.