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