A bypass avoiding only abnormal cells or abnormal electronic components in an electronic appliance having a plurality of battery cells or electronic components is formed to decrease resistance while keeping functionality.

A bypass avoiding only abnormal cells or abnormal electronic components in an electronic appliance having a plurality of battery cells or electronic components is formed to decrease resistance while keeping functionality. An insulating substrate 2; a heat-generating resistor 3 arranged on the insulating substrate 2; a first and a second electrodes 4, 5 arranged adjacently to each other on the insulating substrate 2; a third electrode 6 arranged adjacently to the first electrode 4 and electrically connected to the heat-generating resistor; and a first meltable conductor 8 arranged between the first and third electrodes 4, 6 to constitute a current path capable of being blown by a heat generated by the heat-generating resistor 3 are provided. The first meltable conductor 8 melted by heat from the heat-generating resistor 3 gathers on the first and second electrodes 4, 5 to short-circuit them.

A bypass avoiding only abnormal cells or abnormal electronic components in an electronic appliance having a plurality of battery cells or electronic components is formed to decrease resistance while keeping functionality.

An electrical fuse is provided. The electrical fuse includes a short circuit fusible element and a trigger element connected in series with the short circuit fusible element. The trigger element is chemically activated rather than mechanically activated to interrupt a predefined overload condition with a predetermined time delay.

Provided is a fuse device capable of maintaining the insulation performance while using a fuse element having a considerable size to improve rating. The fuse device includes a fuse element 2 and a case 3 for housing the fuse element 2, and the case 3 has a resin portion 4 having a surface to be melted by heat accompanying blowout of the fuse element 2 on at least a part of an inner wall surface 8a facing the inside 8 housing the fuse element 2.