A special feature of AI… ferrules with insulating collar is that the closer the connections are, the more reliable the insulation is and the less likely the wires are to splice. The dimensions of the ferrules correspond to DIN 46228-4. The metal insulating sleeve is made from a soft electrolytic copper (E-CU) with tin plating, which ensures optimum connection when crimped with the appropriate Phoenix Contact tools. The insulating collar made from polypropylene, which is resistant to extreme heat, insulates and simplifies fitting onto the wire without having to splice the individual litz wires. The cross section sizes are color coded. They are listed according to DIN 46228-4, Weidmüller standard, and French standard NF C 63-023