The IIB explosion-proof classification inherently exceeds IIA, and the T4 temperature class provides lower and safer temperatures than T1. Thus, BT4 has a superior explosion-proof rating.
III | C | T 135℃ | Db | IP65 |
---|---|---|---|---|
III Surface dust | T1 450℃ | Ma | IP65 | |
T2 300℃ | Mb | |||
T3 200℃ | ||||
A Flammable flying flocs | Da | |||
T4 135℃ | ||||
Db | ||||
B Non conductive dust | T2 100℃ | Dc | ||
C Conductive dust | T6 85℃ |
Each explosion-proof class targets specific safety goals. Detailed information can be found by searching on Shenhai Explosion Proof.