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What does 309 suffix indicate on a legacy circuit breaker?

Issue:
Need to determine what a breaker suffix means ?

Product Line:
Square D Legacy Molded Case Circuit Breakers

Environment:
Products sold and used in the North America

Cause:
Need to determine accessory to cross or purchase new breaker
 
Resolution:
Suffix "309" means magnetics to hold 10 times thermal for over 1 1/2 cycles.
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