Suitable for using in IIA,IIB,IIC Explosion hazardous gas zone1 and zone2. Combustible dust IIIA,IIIB,IIIC zone 21 and zone 22 Ex-Mark: Ex db IIC Gb,Ex tb IIIC Db. ATEx Cert. No.:SEV 20 ATEX 0471 U IECEx Cert. No.: IECEx SEV 20.0016U