Features:The insulation class is B; the protective class is IP44.

特点：绝缘等级为B级，外壳防护等级为IP44。

youdao

There are oil-proof grommets between cover and body, that can reach protective class IP65.

箱盖与箱体之间夹有耐油橡胶胶条，可保证防护等级达到“IP65”。

youdao

According to America and europe standard difference. There are two kinds, the test ways of A and B is different, but protective class is the same.

粉尘防爆电气设备根据美标和欧标的差异，为分A、B两种型式。A、B两种采用的试验方法不同，但保护的等级是等同的。

youdao