S3 is a single phase industrial vac with 3 "by-pass" motors. It's fitted with an electronic board for easy control and monitoring. It's available with a 50L bin, 100L bin or a Gravity Unload System (GU) with plastic or Longopac disposal Bag. Available in L-M or H Class certified versions in the "Single Phase for Hazardous Dust "section of the Product Menu.