I need to select another brand of contactors, because the low cost units we have been using are not satisfactory. I am getting pricing on IEC units from Eaton, Allen-Bradley, Schneider/SquareD, and Siemens. After significant web searches looking for independent tests ranking the major brands, I have found nothing. My only recourse is to go to a place where people with experience have probably used several brands or, at least, can testify to the quality of a particular brand. What can you tell me? Are any of these brands superior, what do you prefer?