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It means “Switching Duty”. This rating applies to the switching of fluorescent lights ONLY, not HID lights or any other types of loads. The rating is limited by UL to 15-20A, 1 Pole circuit breakers. See the footnotes in the Siemens 2007 – 2008 SPEEDFAX™. At 480V, only the Siemens BQD and Siemens Sentron™ ED breakers are SWD rated.
