PLC interface, consisting of basic terminal PLC-BSP ... / 21 with tension spring connection and pluggable miniature relay with power contact, for mounting on a DIN rail NS 35 / 7.5, 1 SPDT version contact 2 inverter, AgNi contact material, input voltage 12 VDC operating voltage indication Led Yellow, PLC-RSP- 12DC / 21-21 model. Phoenix Contact