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What is the difference between the ``RB`` and ``R`` suffix on a safety switch catalog number?

NEMA 3R Heavy Duty safety switches with a RB suffix (30 - 200 ampere) in the catalog number will have a hub opening in the top endwall. It will accept 3/4`` through 2 1/2`` B type hubs. The hub opening is covered with a closing cap (BCAP). NEMA 3R Heavy Duty safety switches with a R suffix (400 - 1200 ampere) do not have a hub opening in the top endwall. A field cut opening is required for top conduit entry. B type hubs, 3`` through 4`` can be used


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