PNOZ s7.1 24VDC 3 n/o cascade PILZ Product ID: 750167 PNOZsigma contact expansion, cascadable, outputs: 3 N/O, UB = 24 V DC, width: 17.5 mm, plug-in screw terminals, expansion module for expansion in connection with safety-related control blocks, additional voltage connection to supply voltage to further contact blocks.