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Can you replace a vertically mounted main breaker in an I-line panelboard?

Title:  
Can you replace a vertically mounted main breaker in an I-line panelboard?  

Issue:  
Replacement of main circuit breaker.   

Product line:  
I-Line panelboards sold and supported in the UsA. 

Environment:  
Maintenance 

Resolution:  
You may ONLY replace a vertically mounted main breaker in an I-line panelboard with the same model breaker.  For example, the MAP36600 is obsolete and could NOT be replaced by a current series M-frame like the MGP36600.  Consider replacing the panelboard.  

Keywords:  
I-line panelboards vertical vertically mounted main breaker replacement Powerpact legacy HCN HCM HCW HCWM HCWM-U HCP-SU HCP HCR-U
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