MTL700 series shunt-diode safety barrier are 1 or 2 channel devices which pass an electrical signal in ether direction without shunting it, but limit the transfer of energy to a level that can not iggnite explosive atmospheres. Connected in series with the signal transmission lines on a process plant, they protect hazardous-area wiring and equipment against faults occurring in the safe area, and enable a wide range of measurement and control operations to be carried out simply and inexpensively by intrinsically safe techniques.