Pilz PZE X4 24VDC 4N/OProduct Attribute Attribute Value Alternate Mfr Part Number 774585 Series PZE X4 Series Overview The contact expansion module PZE X4 is an add on device without delay on de energization, and it is used to expand a safety circuit. The contact expansion module is driven by a base unit (e. g. emergency stop relay). Features Positive guided relay outputs: 4 safety contacts (N O), instantaneous LED display for: Switch status of the safety contacts