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What is suffix 1590 on a circuit breaker?

Issue:  
What does the 1590 suffix on a breaker indicate?

Product line:  
Circuit Breakers

Environment:
FAL, KAL, LAL, MAL and PAL Legacy breakers

Resolution:  
1590 is a combination of 1212 (1A1B Auxiliary Contacts) and 1121 (120VAC UVR).
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