Plug-and-socket connector with screw-type connection

Abstract

An improved electrical plug-and-socket connectors with screw-type clamping connections has a step-shaped screw brake for protecting against loss of the clamping screw of connecting stranded conductors of electrical components having as the clamping mode a screw-type clamping connection. The screw brake has one, two or more strips. The plug-and-socket connector has a screw-type connection, having an insulating part, arranged to accommodate at least one contact insert. The contact insert has a substantially cylindrical shape and comprises a contact portion for electrical/mechanical connection to an oppositely shaped contact piece of a matched plug-and-socket connector at a first end of the contact insert. It further comprises an insertion opening for at least one connecting stranded conductor at a second end of the contact insert, there opening in the insertion opening a screw hole which is oriented substantially transversely relative to the central longitudinal axis thereof and comprises an internal thread. The insulating part has a screw channel which is substantially in alignment with the screw hole when a contact insert is accommodated in the insulating part. The screw channel has at least one step. The inside width of the screw channel reduces from a first, greater dimension towards a second, lesser dimension in the direction towards the screw hole of the insertion opening. The screw channel has one or more strips which are oriented substantially coaxially relative to its central longitudinal axis of the and which are so dimensioned that a clamping screw to be inserted in the screw channel fastening the connecting stranded conductor in the insertion opening of the contact insert is subjected to a first, lesser resistance at the strip/strips of the first inside width, and is subjected to a second, greater resistance at the strip/strips of the second inside width.