What are the parameters of industrial explosion-proof heaters - Yangzhou Darui

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The explosion-proof level of industrial explosion-proof heaters is generally (explosion-proof EXdⅡ BT4). What does ExibⅡBT4 mean? IIA, IIB, IIC (safety level: A<B<C) T is the temperature group, T4 means the equipment surface temperature does not exceed 135 degrees, T6 has the highest safety level, meaning the lower the equipment surface temperature, the better.
Class I: Electrical equipment for coal mines; Class II: Electrical equipment for all other explosive gas environments except coal mines.
Class II can be further divided into Class IIA, IIB, and IIC. Equipment marked IIB can be used under the conditions of Class IIA equipment; IIC can be used under the conditions of Class IIA and IIB.
Class III: Electrical equipment for explosive dust environments except coal mines.
Class IIIA: Combustible fibers;
Class IIIB: Non-conductive dust;
Class IIIC: Conductive dust. Maximum surface temperature: The highest temperature reached by any part of the electrical equipment that may ignite the surrounding explosive environment when the equipment operates under the most unfavorable conditions within the specified range. The maximum surface temperature should be lower than the combustible temperature. In summary, this explosion-proof product is an intrinsically safe explosion-proof electrical product that can be used in Zone 1 and Zone 2 of Class IIB gases, with a surface temperature not exceeding 135 degrees.

Note: The above information and technical parameters are compiled and released by Yangzhou Darui Electric Co., Ltd.