Patent ID: 8547195
Filing Date: 2013-10-01
Classification: H01H,H01M,Y02E,Y10T

Abstract:
1. A protection element comprising: a low-melting metal conductor which is provided between a pair of electrodes disposed at both ends of a top face of an insulation baseboard, which is connectable to a power supply path of a device targeted to be protected, and which causes a blowout when a predetermined abnormal electric power amount is supplied; an insulation cover member which is mounted on the baseboard, and which covers the low-melting metal conductor with a predetermined space; and a flux coated on a surface of the low-melting metal conductor and positioned in the space before the blowout; wherein, in a case where the abnormal electric power amount is supplied to the device targeted to be protected, the low-melting metal conductor causes the blowout, and a current path thereof is shut off; wherein said protection element further comprises a stepped portion which is formed by a protrusion on an interior face of the insulation cover member opposite to a center part of the low-melting metal conductor, for adhering to and retaining the flux before the blowout such that the flux remains in contact with both a surface of the protrusion and the center part of the low-melting metal conductor by means of surface tension and wettability; wherein the protrusion comprises a cylindrical protrusive stripe which is formed with a circular stepped portion at a position facing the center part of the low-melting metal conductor; and wherein the insulation cover member is formed in the shape of a box which opens at one side face part thereof, and which is adapted to cover the baseboard with the predetermined space being formed relative to the low-melting metal conductor.