we77WE77Ex-1 115V 1-channel Control circuit EEx ia IIC 115 V AC supply voltage Reversible mode of operation Lead breakage (LB) monitoring 1 relay contact output (change-overInstruction Manual 1. Marking Switch amplifier hazardous WE 77Ex-1 115V, WE 77Ex-1 230V, WE 77Ex-2 115V, WE 77Ex-2 230V ATEX certificate: PTB 02 ATEX 2065