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Can an NW breaker with an L1 interrupting rating go into a cradle for an NW with an N or H rating?

No, the L1 rated NW breakers are keyed to go only into L1 cells, because of the higher interrupting ratings and the differences in the L1 cradle to accommodate the higher ratings. N and H rated breakers can go into L1 cells, but not vice versa.

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