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Can I use a motor rated contactor for a lighting load?

The motor and lighting rated contactors carry different load ratings and as defined by NEMA and UL and must be used as rated. Some lines of motor duty rated contactors are dual rated for both motor and lighting laod and these can be use under the published ratings. Unless dual rated, you cannot use them interchangebly. The contactor load type ratings can be found on the product labeling or catalog data sheets.