TypES of proTEcTioN - dUST Type of protection ATEX code Standard IIA IIA IIA IIA IIB IIC IIA IIA T2 T2 T3 T2 T2 T1 T1 T1 PVC D General Requirements Protection by Enclosures Protection Intrinsic …

This means that their design ensures that however slowly the button is pressed, or cable pulled, if the normally-closed contact opens the mechanism must latch. This prevents “teasing”, which can cause …