Ex: Signifies equipment designed for explosion-proof applications;
d: Specifies that the equipment is of the flameproof explosion-proof type;
II: Classifies the device as belonging to Class II for explosion-proof electrical equipment;
B: Classifies the gas level as IIB;
T4: Indicates a temperature group of T4, signifying that the maximum surface temperature of the equipment does not exceed 135°C;
Gb: Represents the protection grade of the equipment.
