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What are the trip system adjustments for a Powerpact 800 amp M frame breaker ?

Can you adjust or replace the ET1.0 trip unit in the Powerpact M-frame breakers?

Product line:  
Molded case circuit breakers

Powerpact M-frame breakers

The ET1.0 system has only an adjustable instantaneous trip dial ( 2 - 10 x In ).  The system has a fixed long-time pickup.  
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