The Phoenix Contact A 25 -20 ferrule is a crucial component for secure and reliable terminal block connections. Constructed from soft, tin-plated electrolytic copper, this ferrule ensures excellent conductivity and corrosion resistance. Its dimensions conform to DIN 46228-1, making it compatible with a wide range of terminal blocks. The ferrule's 20mm length and silver color provide clear identification and ease of use in industrial applications, particularly in electrical distribution and control systems. While not included in DIN 46228-1: 1992-08, it remains a vital accessory for maintaining robust electrical connections.