Шэньхай Взрывозащищенный
The order of explosion-proof ratings is straightforwardly recorded as A < Б < С.
| III | С | T 135℃ | Db | IP65 |
|---|---|---|---|---|
| III Surface dust | T1 450℃ | Ma | IP65 | |
| T2 300℃ | Mb | |||
| T3 200℃ | ||||
| А Flammable flying flocs | Da | |||
| T4 135℃ | ||||
| Db | ||||
| Б Non conductive dust | T2 100℃ | Dc | ||
| А Проводящая пыль | T6 85℃ |
For the ‘T’ rating, it’s remembered by its numerical order: the larger the number, the higher and safer the rating.
Therefore, an explosion-proof rating of BT4 surpasses that of AT2.
It’s important to clarify that ‘T’ denotes the maximum surface температура of electrical devices. A T4 rating, set at 135°C, is applicable for взрывной gases with flash points exceeding 135°C.