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What is the difference between IP 65 and IP40 on selections of ZB4BL9334 dual pushbuttons?

Product Line:
22 mm push buttons

Products sold and used in the United States

IP 40 is protected against solid objects, but is not watertight, similar to NEMA 1, IP 65 is protected against dust and water jets, similar to NEMA 4.

(1st number )
Protection against contact and penetration of solid bodies
(2nd number )
Protection against the penetration of liquids.

4= protection against solid 0= not protected
6= Dust tight 5= protection against water jets

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