ATEX 94/9/EG Gas: II 3 G Ex nanC IIC T5 (SRB in zone 2) Gas/dust: II (2) GD [Ex ib] IIC/[Ex ibD]. SRB-EXi, ATEX Safety Relays. A new generation of safety relay modules that combine the approved safety technique with the demands of explosion protection. Designed for equipment of the category 2GD. Emergency stop devices and safety door monitors may be used in gas and dust explosive atmosphere. Suitable for emergency stop control devices and guard door monitoring. 1 or 2 channel control Optional cross short monitoring Current and voltage limitation of input - intrinsically safe Green LED display