Contact expansion, inputs: 1-channel wiring, outputs: 4 N/O t-d, UB = 24 V DC, width: 22.5 mm, screw terminals integrated, delay-on de-energisation contact block for contact expansion inconnection with safety-related control components, delay time permanently set 1 s. http://www.pilz.com Safety solutions provider since 2011, We offer Pilz