An electrical apparatus including, for the connection and disconnection of a conductive cable : - an orifice (21, 22, 23, 24; 89, 90) for introducing said cable ; - a resilient strip (33, 34; 91) including a holding ridge , which resilient strip (33, 34; 91) is facing said introduction orifice (21, 22, 23, 24; 89 , 90) and facing a contact portion of a conductive element connected to the rest of said apparatus, said resilient strip (33, 34; 91) as well as the introduction orifice it is facing as well as the conductive element , including the contact portion , it is facing being configured so that a contact end of one said conductive cable is insertable into the introduction orifice to come into a connection position where the contact end is pinched between the holding ridge and the contact portion ; and - a pusher (50; 72) associated with said resilient strip (33, 34; 91), configured to bear against said resilient strip (33, 34; 91) and drive the holding ridge of said resilient strip (33, 34; 91) away from said contact portion whereby the conductive cable whose contact end was pinched can be removed, said pusher (50; 72) including a control button (31, 32; 70, 71) which is movable between an extended position and a retracted position in which the pusher (50; 72) is bearing on the resilient strip (33, 34; 91) to put the holding ridge away from the contact portion ; characterized in that said pusher (50; 72) and walls included in a casing of said apparatus to delimit a housing in which said key (31, 32; 70, 71) is located are configured so that said key (31, 32; 70, 71) is movable with respect to the rest of the pusher (50; 72) between a relative nominal position and a relative locking position that the key (31, 32; 70, 71) can take exclusively when the pusher (50; 72) is in the retracted position, with the pusher (50; 72) which is freely movable between said extended position and said retracted position when the key (31, 32; 70, 71) is in the relative nominal position and with the pusher (50; 72) which is held in the retracted position when the key (31, 32; 70, 71) is in the relative locking position. - an orifice (21, 22, 23, 24; 89, 90) for introducing said cable ; - a resilient strip (33, 34; 91) including a holding ridge , which resilient strip (33, 34; 91) is facing said introduction orifice (21, 22, 23, 24; 89 , 90) and facing a contact portion of a conductive element connected to the rest of said apparatus, said resilient strip (33, 34; 91) as well as the introduction orifice it is facing as well as the conductive element , including the contact portion , it is facing being configured so that a contact end of one said conductive cable is insertable into the introduction orifice to come into a connection position where the contact end is pinched between the holding ridge and the contact portion ; and - a pusher (50; 72) associated with said resilient strip (33, 34; 91), configured to bear against said resilient strip (33, 34; 91) and drive the holding ridge of said resilient strip (33, 34; 91) away from said contact portion whereby the conductive cable whose contact end was pinched can be removed, said pusher (50; 72) including a control button (31, 32; 70, 71) which is movable between an extended position and a retracted position in which the pusher (50; 72) is bearing on the resilient strip (33, 34; 91) to put the holding ridge away from the contact portion ; <EOS>