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What's the difference between ATS22..S6U and ATS22...S6 Softstart models?

Issue:
What's the difference between an ATS22..S6U and  ATS22..S6 soft start models?

Product Line:
Altistart 22 ATS22

Environment:
All models, All series

Cause: 
Altistart has difference voltage suffix S6U and S6.  

Resolution:
The ATS22..S6 model requires 220vac control power and has 24vdc logic inputs.
The ATS22..S6U model requires 110vac control power and has 110vac logic inputs.

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