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Molded Case Breakers
Powerpact H or J
Difference of styles
The trip units are the same in either type of breaker. The breakers that have the Field-Interchangeable trip units have Line and Load Markings and they can not be back fed. They are available as unit mount only and are not available as I-Line. The "seal" is the real difference. If the seal is broken on a trip unit that is not replaceable the warranty is void.