Ce înseamnă semnul de protecție împotriva exploziilor Exd IIB T4 Gb

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 temperatură 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.