Viconics R851B-8 SKU: R851B-8 $275.81 $788.02 Quantity -+ Call for Lead Time Details Viconics R851B-8 : Step Controller, 8 Stages (AC/DC isolated Output) with Vernier Output for Boilers Data Sheet DetailsData Sheet Back Viconics R851B-8 : Step Controller, 8 Stages (AC/DC isolated Output) with Vernier Output for Boilers Back Stocked items ship in 1 business day. Factory items typically ship in 3-5 business days (estimate only). Actual times may vary.Email sales@energycontrol.com for more information.