1, 1 and Zone 2 hazardous locations. 2, IIA, IIB, IIC class group explosive atmosphere. 2 Features Editor First, increased safety enclosure, built-in components for explosion-proof components. Explosion-proof master controller (6) Second, the shell is made of glass fiber reinforced unsaturated polyester resin from repression, has a beautiful appearance, corrosion resistance, anti-static, impact resistance and good thermal stability and excellent performance. Third, flameproof control switch with a compact structure, good reliability, small size, strong capacity, long life, and a variety of functions to be selected. Ex button by ultrasonic encapsulation process to ensure a reliable bonding strength, buttons can be freely combined two units, explosion-proof lights using a special design, the AC 220 ~ 380V universal. Fourth, exposed fasteners are made of stainless steel, easy to prevent out design and maintenance. Fifth, the housing and cover the joints using a labyrinth structure, with good waterproof, dustproof capabilities. Sixth, in line with GB3836-2000, IEC60079 standards.