Phoenix Contact 3035577 To determine the current and voltage of a terminal block, it's essential to understand the specifications of the plug used, as these values provide crucial information for safe and reliable operation. The nominal voltage is 400 V, while the nominal current is 20 A. The connection method employed is spring-cage, with rated cross sections ranging from 0.08 mm2 to 4 mm2, depending on the specific requirements of the terminal block. Additionally, mounting options are available as NS 35/7,5 and NS 35/15, while the color coding is standardized to blue for easy identification.