Abstract: A modular plug has at least two rows of contact chambers lying next to one another in which spring contacts are located. The spring contacts are connected at one end to the conductors of a cable. The first and last spring chambers of each row are designed as empty chambers into which catch hooks can be introduced. These empty chambers are employed to accept strain relief inserts which are designed as L-shaped structures in which an elongate member of the L-shaped strain relief insert terminates in a catch hook to bear against the forward face of the plug and the cross member of the insert is designed as a tab which has passages therethrough which lie opposite similar passages of a second strain relief insert upon engagement of the elongate members in the empty chambers. The cable can thereby be introduced between the cross members and secured by the cable strap which extends through the passages.