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An HJA breaker is not fitting properly in an older I-line panel. Is there a difference in the way the HJA installs compared to the older F and K frame breakers?

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The screw on the off end of an H frame circuit breaker (mounted in an I-Line panel) needs to be affixed to a slot on the backpan, not a round hole. This differs from the earlier F and K frame breakers which used the round hole for the mounting screw.
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