What is the difference between a Q2-H and a Q2H breaker?

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Issue:
Product Characteristics

Product Line:
Molded Case Circuit Breakers

Resolution:
Q2-H catalog numbers end with the letter H and are rated 22 kAIC.
Q2H catalog numbers have H as the 3rd or 4th digit of the catalog number (Q2H or Q2LH) and are rated 42 kAIC.