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What does the suffix 1121 mean?

What is the suffix for a 120V under voltage trip unit  for a  FAL, KAL or LAL breaker?  

Product line:  
Molded case circuit breakers

Legacy FA, FH, FAL, FHL, LA, LH, LAL, LHL breakers

A circuit breaker with a 1121 suffix has a 120Vac undervoltage release (UVR) in the left pole.  Suffix 1101 would have the UVR in the right pole.
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