X 24 V dc Safety Relay – Single Channel With 4 Safety Contacts , Automatic Reset. X 24 V dc Safety Relay Single Channel With 4 Safety Contacts Automatic Reset PZE X4 24VDC 4n/o 774585 Pilz is a safety relay module designed for industrial applications. It provides 4 normally open safety contacts for controlling safety circuits. This item can be purchased at PLC2Day.