Differences between an ATS22..S6U and ATS22..S6 soft start models.
Altistart 22 ATS22
All models, All series
Altistart has difference voltage suffix S6U and S6.
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.