PNOZ s4 48-240VACDC 3 n/o 1 n/c Product ID: 750134 PNOZsigma safety relay (standalone), inputs: 1/2-channel wiring with/without detection of shorts across contacts, outputs: 3 N/O,1 N/C, 1 SC, UB 48 – 240 V AC/DC, width: 22.5 mm, plug-in screw terminals, monitoring of E-STOP, safety gates.