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Is the KAL breaker interchangeable with the Powerpact H/J breakers?

Powerpact H- or J-frame breaker will not fit in existing enclosure for KAL breaker.  

Product line:  
Molded case circuit breakers

Powerpact H- and J-frame breakers

The Powerpact H- and J-frame breakers are the recommended replacements for the KAL and KHL series of breakers, however they are not direct replacements.  The KAL and Powerpact H and J breakers have different dimensions, mounting, and use different accessories such as operating mechanisms, shunt trips, enclosures, etc, so the existing equipment may need to be modified or replaced.  
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