The 9-1393159-5 is a plastic insulator accessory designed for use with relay mounting systems, specifically for creating end clips on the 24A110 DIN rail style mounting track. This component is used in conjunction with the 24A071 steel mounting clip to form a complete end clip assembly for the 24A110 track, which is part of the Potter & Brumfield K10 relay socket and accessories product line. The insulator is manufactured from plastic material and is part of a comprehensive mounting solution that supports various relay socket configurations including screw terminal and snap-mount options. This accessory is essential for completing modular relay mounting installations where multiple sockets and tracks require secure end termination and electrical isolation.