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What is suffix 2100 and how does it work?

Need to know what suffix 2100 indicates on a breaker part number

Product Line:  
All products with this suffix.

QO/QOB, older MCCBs such as FA/FAL, LA/LAL, etc

Suffix 2100 specifies a normally open bell alarm contact.  
A bell alarm changes state only if the breaker trips or is reset. The 2100 is normally open and closes when the breaker trips.  
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