Industrial 11D520 Printed Circuit Board

Industrial 11D520 Printed Circuit Board from Boston Digital is the 2-1 configuration of a control panel board, pairing the 11D520 PCB with its companion 11D521 PCB within the same assembly. In catalogs and listings, it’s described as the Boston Digital Control Panel Board Card 2-1, with references to both 11D520 PCB and 11D521 PCB (11D521 Rev. E appears in some listings). Refurbished and used variants of the two-board set are advertised by distributors, including references to 2111D520PCB as a refurbished version of this board. This PCB set functions as replacement parts for existing Boston Digital control panels in industrial automation environments, enabling restoration or continuation of the panel’s internal control circuitry. Buyers commonly source both part numbers together to ensure they obtain the compatible two-board set for the original assembly. Because the boards come from a legacy Boston Digital system, compatibility depends on matching the 11D520/11D521 family and the 2-1 configuration to the specific control panel in use.