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What does the F indicate in XALK178FH7?

Issue:
What does the F indicate in XALK178FH7

Product Line:
XALK / XALD / XB5 / ZB5

Environment:
22mm Control Station

Resolution:
F is for 2 Normally Closed Contact Blocks
E is for 1 Normally Open + 1 Normally Closed
G is for 2 Normally Closed + 1Normally Open
 
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