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What does an ``EX `` suffix mean on a XB4 push button catalog number?

Issue:
Trying to identify form EX on XB4, 22mm buttons.

Product Line:
22mm Operators - GIC Product

Environment:
European Offer

Cause:
n/a

Resolution:
Form EX indicates a product that meets ATEX requirements (for an explosive dust atmosphere per IEC Directives 99/92/EC and 94/9/EC).  These products have not been commercialized or sold in the USA.
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