we 77WE 77Ex-2 The transformer isolated barrier transfers dital snals into hazardous areas. Sensors per EN 60947-5-6 (NAMUR) or mechanical contacts may be used as transmitters.Part Number: WE 77Ex-2 230V The device transfers dital snals into hazardous areas. Sensors per EN 60947-5-6 (NAMUR) or mechanical contacts may be used as transmitters.