23 Year Industrial Explosion-Proof Manufacturer

+86-15957194752 aurorachen@shenhai-ex.com

Ex Td A21 Explosion Protection Level

The Ex td a21 designation classifies it as either Class II, Category B, or C for explosion-proof standards.

Explosion Proof TypeGas Explosion-proof SymbolDust Explosion-proof Symbol
Intrinsically Safe TypeIntrinsically Safe Typeia,ib,ic,iD
Exmma,mb,mcma,mb,mc,mD
Barotropic Typepx,py,pz,pxb,pyb,pzcp;pb,pc,pD
Increased Safety Typee,eb/
Flameproof Typed,db/
Oil Immersed TypeO/
Sand Filled Moldq,qb/
N-typenA,nC,nL,nR,nAc,nCc,nLc,nRo/
Special TypeS/
Shell Protection Type/ta,tb,tc,tD

Ex: Signifies that the electrical equipment meets one or more explosion protection types outlined in China’s GB3836 standards, making it appropriate for environments with explosive hazards.

td: This represents protection through the use of an enclosure.

a21: Specifies Class A electrical equipment designed for Zone 21 dust explosion settings.

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