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