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What is form X21 on part number 8502SBT3V02SX21 is?

8502SBT3V02SX21 has form X21 and what does it mean.

Product Line:
Type S Contactor

NEMA Contactors and Starters

Form X21 are 2 normally open and 1 normally closed auxiliary contact. System won't recognized the part with the said form. It needs to be built through product selector.
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