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

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

Product Line:
NEMA Contactors and Starters

Environment:
8903 Lighting Contactors

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