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What is the handle lock off for a single pole FY breaker in an NH1B panel? What is the difference between a series 1 and series 2 single pole FY. Had tried using a HPAFK but it doesn`t fit.

The series 1 FY breaker had been discontinued in mid 80`s. The series 2 FY is a single pole FA breaker relabeled as FY. If the HPAFK didn`t fit, the HPAFYQ must fit.

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