Abstract: A separable connection device between a conducting lug and at least one connecting wire. The device includes means for providing an electric connection between at least one jumper cable wire having a conducting core surrounded by an insulating sheath and a conducting clamp. The conducting clamp is formed with at least one cutting slit adapted for cutting the sheath of the wire during the introduction of said wire in the slit and establishing a contact with the wire conducting core. Additional means are provided for providing the electric connection between the clamp and the lug, and means for causing the progressive engagement of the clamp on the wire.