Barrier bypass diode. MTL7787
All MTL7700 series barriers are based on the same simple principle. Each channel contains two pulse stages of the term connected Zener diode test or a “foolproof” termination resistor.
In the event of an electrical failure in the safe zone, the diodes limit the voltage that can reach the hazardous area and the resistance limits the current.
A fuse that protects diodes and the two stages of permanent safety voltage limitation if any of these steppes fail.
MTL7787+ is certified “ia” for all zones and “IIC” for all explosive atmospheres.