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Do all breakers come with line and load terminals?

No letter on the end of the catalog number means line and load terminals are included, except on the F-frame family. They come with load side terminals only as standard, and an “L” must be added to the end of the part number to have line and load terminals. Example, FD3100 would become FD3100L. To order a breaker with only load side terminals, you will add the X suffix to part number. To order a breaker with only line side terminals, you will add the Y suffix to the part number.