Basics of Explosion ProtectionTypes of Protection for Electrical Apparatus in Areas with Combustible Dust

Types of Protection Types of protection for electrical apparatus in areas with combustible dust Type of protection Diagram Main application Standard protection by enclosure tD switchgear and control station, professional terminal and connection boxes, industrial control boxes, motors, professional light professional fittings tD A21 = under procedure A for Zone 21tD B21 = under procedure B for Zone 21 EN 61 241-1 IEC 61 241-1
11107E00 pressurization pD switchgear and control industrial cabinets, motors EN 61 241-4 IEC 61 241-4
11108E00 intrinsic safety iD measurement and control technology, fieldbus technology, detection, actuators suppliers iaD = for use in Zone 20, 21, 22ibD = for use in Zone 21, 22[Ex ibD] = associated electrical apparatus - installation in the safe area EN 61 241-11 IEC 61 241-11
11109E00 encapsulation mD switchgear with small capacity, control and signalling units, professional display units, sensors maD = for use in Zone 20, 21, 22mbD = for use in Zone 21, 22 EN 61 241-18 IEC 61 241-18
11110E00 General Catalogue 13.02.2006

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