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What is the Difference Between the Two Coils on the 8903 Mechanically Held Lighting Contactor?

There are two different part numbers for the latch and unlatch coils.

Product Line:
NEMA Contactors and Starters

8903 Lighting Contactors

One is a latching coil and is continous duty rated. The other is an unlatch coil and is not continuous duty rated.
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