Abstract: Safety device which can be activated, in particular, by a moving body such as a person or an object, in particular a safety gate, comprising a post (2) carrying, at a distance from the ground, a crossbar (4), a first connector for joining the bar to the post and a second connector (3) for joining the post to the ground, at least one of the connectors comprising a holding device (14, 15) capable of releasing the bar when it is subjected to a force caused by the passage or the movement of the said body, and an electrical connection (15) stressed when the bar is released.

Abstract: A switch is provided comprising an insulating case supporting two conducting terminals, and a removable conducting rod coming to bear against the terminals so as to establish electric contact. The rod is held in abutment against a portion of a case and against the terminals by a retaining disk urged by a spring and operable by means of a resetting lever. Auxiliary electric conductors, formed from spring wires, comprise a helical part held in place by the screw shaped terminals and a rectilinear part bearing resiliently against the rod. The auxiliary electric conductors remain in contact with the rod during its reversible resilient travel so as to maintain the electric contact until definite release of the rod. Definite release occurs when the rod exceeds its reversible resilient travel and escapes the case and the retaining disk. The switch is effective to break an electrical circuit in the presence of frost and vibration such as to provide safety on cable transporting pylons.

Abstract: The fuse comprises an elongated support formed at least partially from ferrite, magnetized in the direction of its thickness and on which is disposed, between two terminals, a metal wire (9) capable of being destroyed by melting. The fuse comprises for example two ferrite strips (5 and 6) assembled together and spaced apart by means of two insulating-material bars (7 and 8), a silver wire (9) being disposed between the two strips. When the wire melts, the molten metal and the electric arc are driven laterally in accordance with the LAPLACE law.