we77WE77Ex-1 230V 1-channel Control circuit EEx ia IIC 230 V AC supply voltage Reversible mode of operation Lead breakage (LB) monitoring 1 relay contact output (change-overPepperl + Fuchs WE 77EX-2 PEPPERL + FUCHS SWITCH AMPLIFIER, 198-253VAC, 45-65HZ, 2-CHANNEL, SCREW TERMINALS, IP20 part of Zener Barriers, distributed by Kempston