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What does suffix 5276B mean on a QOU breaker, like QOU2605276B?

Part number identification, suffix

Product Line:
Miniature Circuit Breaker

QOU breakers 

It is an OEM breaker. The -5276 indicates a special marking with the customer part number appearing on label and carton. The B is bulk packaging. There is nothing mechanically or electrically different from the standard QOU260.
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