BW2388ASi 4I Module for Light Switches

"IP20":
Protected against solid foreign bodies having a diameter of 12.5 mm or larger and against finger contact, not protected against water.

"IP40":

Protected against solid foreign bodies having a diameter of 1.0 mm or larger, protected against access with a wire, no protection against water.

"IP54":

Protection against dust in damaging amounts, complete protection against contact, protection against splashing water in any angle.

"IP65":
Dust-tight, full protection against contact, protection against spray water (jet) from any angle.

"IP67":

Dust-tight, full protection against contact, protection against temporary immersion.