Phoenix Contact 3213965 To ensure secure fastening of the neutral busbar, supports must be installed at both ends of each terminal strip and every 20cm along longer strips. The N disconnect terminal block has specific requirements, including a nominal voltage of 250V and a maximum nominal current of 32A, and features push-in connections with a rated cross-section range of 4mm² to 6mm², as well as mounting types NS35/7.5 and NS35/15 in blue color.