摘要:
A protective element that is capable of promptly reliably disconnecting a current path by taking advantage of the erosion phenomenon of a solder in a melted state. A plurality of electrodes (114) are formed by a first electrically conductive layer (112) deposited on a substrate (111) and by a plurality of second electrically conductive layers (113) spaced apart from one another in the in-plane direction of the substrate (111) on which the first electrically conductive layer (112) has been deposited. A solder paste (116) has a wetting performance for the electrodes (114) higher than that for the substrate (111) and is deposited on top of the first and second electrically conductive layers (112, 113) formed on the substrate. The solder paste melts by at least one out of heat generated by a resistor (103) and heat generated by a stack of the electrodes (114) and the solder paste (116) in such a manner that, as the solder paste erodes the portion of the first electrically conductive layer (112) intermediate between the electrodes (114), it is attracted towards the electrodes (114) exhibiting higher wettability by it than that of the substrate (111).
摘要:
An object of the present invention is to provide a protective element with which, while implementing a reduced height, a reliable blowout of a low-melting point metal upon a current path by heat of a heating body is possible. The protective element includes: a substrate (11) in which a concave portion (11a) is formed, a heating body (12) which is layered in the concave portion (11a); a second substrate (13) which is layered upon the substrate (11) to cover the heating body (12); first and second electrodes (14a), (14b) which are layered upon the surface of the substrate (11) on which the second substrate (13) is layered; a heating body electrode (15) which is layered upon the second substrate (13) to be superimposed with the heating body (12), and which is electrically connected to the heating body (12) and a current path between the first and the second electrodes; and a low-melting point element (16) which is layered from the heating body electrode to the first and second electrodes, and which causes a blowout of the current path between the first electrode and the second electrode by heating. The heating body electrode (15) is positioned in the same location relative to the first electrode (14a) and the second electrode (14b) which is specified in the thickness direction of the substrate (11).