The WKN 2.5 E/U (57.403.7055.0) is a multi-tier feed-through terminal block designed for DIN rail electrical installations with screw connection. It features upper and lower feed-through tiers that are connected, accommodating fine stranded wire from 0.5 to 2.5 mm² and solid wire from 0.5 to 4 mm², with a rated voltage of 500 V and 6 kV impulse rating at 24 A continuous current. The block has a compact width of 5 mm and wire strip length of 8 mm, meeting EN 60 947-7-1 and DIN VDE 0611 T1 standards. This terminal block is ideal for sensor/actuator applications, control systems, and industrial automation where space-saving, clear wire connections, and reliable electrical distribution are required.