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What does the symbol of arrow pointing to the right inside a circle mean for a XCSA or XCSB switch?

Issue:
What does the symbol of arrow pointing to the right inside a circle mean for a XCSA or XCSB switch?

Product Line:
XCSA and XCSB 

Environment:
Safety interlock and limit switches

Resolution:
Positive opening contacts, or direct opening. If NC contacts weld shut, they will be forced open when the device is energized .
It is a definition of a safety contact is only true for NC, not NO.
 
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