PNOZsigma safety relay (standalone), inputs: 2-channel wiring, wiring, 1 N/O, 1 N/C per pushbutton, outputs: 3 N/O, 1 N/C, 1 SC, UB 24V DC, width: 22.5 mm, plug-in screw terminals, two-hand control relay simultaneity monitoring with two-hand pushbutton.