Safety relay (standalone), inputs: Per pushbutton 1 N/O, 1 N/C, outputs: 3 N/O, 1 N/C, UB = 24 V AC, width: 22.5 mm, plug-in screw terminals, two-hand control relay/monitoring of simultaneity of two-hand pushbuttons, feedback loop. http://www.pilz.com Safety solutions provider since 2011, We offer Pilz