PSSu A Con 1/4 S (2 pcs.) 313110 PSSu, connector set for supply voltage, 1-row, 4-pin, screw connection, PU 2 connectors. The PSS 4000 automation system is the optimum solution for smooth production – and that includes safety and automation! For PSSuniversal, we provide accessories such as end brackets for top-hat rails, terminating plates, terminals, USB cables and connectors.