Phoenix Contact 3033210 The electrical connections have varying specifications for both load and line contacts. Load contact terminals are connected via a spring-cage mechanism with rated cross sections ranging from 0.2 to 10 square millimeters. In contrast, the line contact terminals use screw connections with rated cross sections spanning between 1.5 and 50 square millimeters. The corresponding mounting standards and colors for these connections include NS 35/7,5, NS 35/15 in blue color.