danger zone

Device protection level

Explosion-proof mark

Explosion-proof type

Zone 0

Ga

Ex ia

Intrinsically safe "ia"

Ex ma

Cast type "ma"

Ex s

Special type designed for Zone 0

——

Composite type designed for Zone 0

Zone 1

Ga, Gb

——

Explosion-proof type for Zone 0

Ex d

Flameproof

Ex ib

Intrinsically safe "ib"

Ex e

Increased safety*

Ex px, Ex py

Positive pressure type

Ex o

Oil-filled

Ex q

Sand filling type

Ex mb

Molded type "mb"

Ex s

Special type designed for Zone 1

Zone 2

Ga, Gb, Gc

——

Explosion-proof type for Zone 0 and Zone 1

Ex nA, nC, nR

"n" type

Ex e

Increased safety

Ex pz

Positive pressure type

Ex s

Special type designed for Zone 2

Ex ic

Intrinsically safe "ic