Explosion-proof operation column (box) (hereinafter referred to as operation column), explosion-proof operation column is also called explosion-proof control box, explosion-proof button box, and dozens of buttons can be installed according to user needs. It can be used in the explosive gas environment of IIB and IIC in the factory and the dangerous places with explosive dust of T1-T6 group in Zone 21-22, for the control of electrical equipment in the circuit of AC 50Hz, voltage AC220V/380V/DC24V. Explosion proof mark ExdeIICT6Gb/ExtD A21 IP65 T80°C.