we 77Pepperl+Fuchs Process Automation WE 77EX-2 115V. Switch Isolator, 2 Channel, 1 Form C, OutputChannel, 110-115VAC, 129200. Mfr. Part #: WE 77EXPart 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.