What do the explosion-proof Ex marking and coal safety MA marking mean respectively?

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What do the explosion-proof Ex marking and coal safety MA marking mean respectively? Many customers do not understand what the Ex mark and the MA mark mean. Next, the editor will give you a brief explanation. The Ex mark is an abbreviation for the English term Explosion-proof, meaning it is designed to resist explosions. The presence of this mark on a product indicates that it meets the requirements of explosion-proof standards and is therefore an explosion-proof product. The letters following the explosion-proof mark Ex indicate the type of explosion protection, the equipment category for use in a particular environment, the temperature group, and the equipment protection group. In accordance with the requirements of GB 3836 standard, the explosion protection marking for explosion-proof electrical equipment includes: explosion protection type + equipment category for the application site + temperature group + equipment protection group. For example: the explosion-proof mark Ex d IIC T4 Gb, where Ex indicates an explosion-proof product, meaning that the product is designed to be explosion-proof ； d indicates that the explosion protection type is flameproof, suitable for Zones 1 and 2 ； IIC indicates that it is permitted for use in IIC-class explosive gases (with hydrogen as a representative gas) ； T4 indicates that the surface temperature of the device does not exceed 135℃ ； Gb indicates that the protection level of the device is “high”. https://pic2.zhimg.com/80/v2-ff5cc4a4d3bdabe2c0c4c84ec87847d1_720w.jpg MA is the abbreviation for Mei An, referring to coal safety. So the MA mark is the coal safety mark. In our country, equipment and products used in coal mines must obtain a coal safety mark in accordance with the relevant requirements set by the Safety Standards Center; this is a mandatory mark certification. https://pic3.zhimg.com/80/v2-a41a28c9605fb3d76caf53b4bb285f4e_720w.jpg