PLC interface, consisting of basic terminal PLC-BSP ... / 21 with spring connection and pluggable miniature relay with multiple contact position for mounting on DIN rail NS 35 / 7.5, operating voltage Yellow LED indication, version contact inverter 1, contact material AgNi, input voltage AC 230 V / 220 V DC, PLC-RSP-230UC / model 21-21. Phoenix Contact.