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What does suffix 1221 mean on a FAL3605016M breaker?

What is the suffix 2121 on a FAL breaker?

Product Line:
Legacy Breaker

Distribution Equipment

Suffix 1221 means:
1212 - 1A1B aux switch
1027 - 24VDC shunt trip
(35) - Breaker is rerated for 50 degree C Ambient
8002 - Special Cu lugs

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